Gastropod organism collecting device and use thereof

Abstract

Provided are a simple and highly efficient gastropod organism collecting device and use thereof, which utilize behavior of a gastropod organism to eliminate an effort involved in a manual process and a burden of heavy labor, which are required to search for gastropod organisms. This gastropod organism collecting device comprises a plurality of guide pieces radially arranged, and a capture unit which fixes an end part of each of the guide pieces and which has an opening part formed between tips of the guide pieces, wherein the opening part of the capture unit is larger than the maximum outer diameter dimension of the target type of gastropod organism.

Description

Gastropod organism collection device and its use

[0001] The present invention relates to a collection device for capturing and exterminating gastropod organisms that cause damage to agricultural crops, and in particular to a gastropod organism collection device that efficiently captures and exterminates gastropod organisms by utilizing the habits of the gastropod organisms, and its uses.

[0002] In recent years, damage to rice paddy crops caused by gastropods has become increasingly serious. Examples of such gastropods include the invasive giant apple snail (Pomacea canaliculata) and its color mutant, the golden apple snail.

[0003] The giant snail is an invasive species native to South America, and was initially imported to Japan in 1981 for food purposes. However, while demand for it as food did not increase, individuals that escaped from farms or were discarded have become wild and are causing severe damage to Japan's major native paddy crops, such as rice, lotus root, and rush. Since the damage first became apparent in 1983, the affected areas have moved north due to the effects of global warming and other factors, and have now reached northern Kanto.

[0004] In Japan, giant snails were designated as harmful animals under the Plant Protection Law in 1984, and their import was banned, but they continue to cause severe damage.

[0005] In the case of transplant cultivation, it is said that a density of 2.5 giant snails per square meter in a paddy field, and just 0.5 snails per square meter in the case of direct seeding, is enough for damage to occur. Once a paddy field has been damaged and has missing stalks, it is necessary to replant seedlings, but at this point not only cannot rice transplanters be used, but even if the seedlings are replanted by hand, they will be damaged again, so in many cases they are left unattended.

[0006] To reduce the damage caused by giant pond snails, techniques have been developed such as shallow water management to keep the water depth in rice paddies shallow, spraying pesticides, and tilling in winter.

[0007] However, eradicating giant pond snails, which cause extensive damage to paddy field crops, is still heavily dependent on manual labor, placing a heavy burden on agricultural producers who are struggling with an aging population and labor shortages. This is particularly a factor hindering the spread of direct seeding, which is expected to be low-cost and labor-saving as the next generation of rice production.

[0008] The damage caused by giant snails is not limited to Asian regions such as Thailand, the Philippines, Taiwan, and China, but is also spreading to the Hawaiian Islands and their native South America, making it a problem that needs to be solved not only in Japan but internationally.

[0009] Currently, the giant snail is listed in the "World's 100 Worst Invasive Alien Species" compiled by the International Union for Conservation of Nature (IUCN). In Japan, it is also listed as a "priority alien species" in the list of alien species to prevent ecosystem damage compiled by the Ministry of the Environment and the Ministry of Agriculture, Forestry and Fisheries.

[0010] When capturing shellfish (gastropods) that damage rice paddy crops, such as giant pond snails, they are usually lured with bait and captured in traps, or captured by hand over a wide area. However, these capture methods have problems such as low capture efficiency and heavy labor, as they are basically mostly manual.

[0011] For this reason, there is a growing global need for gastropod organism collection devices that can efficiently collect gastropod organisms.

[0012] For example, a conventional device for collecting gastropod organisms is a portable trap that can capture giant snails on the spot, and is formed by attaching a collection section for scooping up giant snails and bait, a separation section for sieving and removing objects larger than giant snails, a holding section that has both sieving and holding functions to hold only the giant snails that remain after sieving out the giant snails that fall below the sieve and the mud and sand mixture, an extraction section for discharging the giant snails, side enclosures and transfer prevention sections to prevent them from flying out or spilling when scooping or sieving, and a handle and grip section to make it easier to carry and use (see Patent Document 1).

[0013] There is also a trap that has an entrance on the side of a container, and vegetable scraps are placed inside to take advantage of the feeding habits of giant snails, attracting, capturing, and exterminating them (see Patent Document 2).

[0014] JP 2010-099057 A Utility Model Application No. 2005-6704 A

[0015] However, conventional gastropod collection devices, even portable ones like those in Patent Document 1, require knowledge and experience to understand the movements and habits of gastropods in advance, and furthermore, require the hard work of searching for gastropods.

[0016] Similarly, even in the case of a method such as that described in Patent Document 2 that utilizes or suppresses the feeding behavior of gastropods, knowledge and experience are required to be able to understand the movements and habits of gastropods in advance, and furthermore, the hard work of searching for gastropods is required as a prerequisite.

[0017] In other words, even with a portable collection device such as that in Patent Document 1 or an attractant trap with an entrance on the side of a container such as that in Patent Document 2, gastropod organisms are exterminated, which are sparsely distributed, so it is necessary to find areas where gastropod organisms are congregating in advance, which requires specialized knowledge and experience and a great deal of effort.

[0018] In addition to the capture aspect, there is also a need for technology to grasp the number of giant pond snails, a gastropod organism that lives in rice paddies, and to predict and estimate the state of their occurrence in advance, in situations where water level management is difficult due to prolonged rainfall and sudden heavy downpours, in addition to the increase in the number of occurrences due to the expansion of habitats and higher overwintering rates due to rising temperatures in recent years.

[0019] It is thought that collection efficiency could be improved if it were possible to predict and estimate the population density and occurrence of gastropod organisms in advance, but such an excellent device for detecting the occurrence of gastropod organisms is not yet known.

[0020] The present invention has been made to solve the above-mentioned problems, and aims to provide a simple and highly efficient gastropod organism collection device and its uses that utilizes the habits of gastropod organisms and eliminates the need for the manual labor and heavy work of searching for gastropod organisms.

[0021] The inventors have been researching and developing collection techniques from an engineering perspective to address the damage caused by giant snails, a type of gastropod organism that is rapidly increasing in number. In the process, they discovered that by utilizing the unique behavioral characteristics of giant snails, it is possible to efficiently collect giant snails, leading to the invention.

[0022] Thus, the gastropod organism collection device of the present application is a gastropod organism collection device that collects gastropod organisms, and is equipped with a capture section that has a plurality of guide pieces arranged radially, the end ends of the guide pieces fixed to each other, and an opening between the tips of the guide pieces, and the opening of the capture section is formed larger than the maximum outer diameter dimension of the target type of gastropod organism.

[0023] In this way, the gastropod organism collection device of the present application is a gastropod organism collection device that collects gastropod organisms, and is equipped with a capture section that has a plurality of guide pieces arranged radially, the end ends of the guide pieces fixed to each other, and an opening between the tips of the guide pieces, and the opening of the capture section is formed to be larger than the maximum outer diameter dimension of the target type of gastropod organism, so that the size and shape of the opening of the capture section make it easy for individual gastropod organisms to enter without crowding, and the radially formed guide pieces allow gastropod organisms to enter the end ends of the guide pieces from all directions 360 degrees, making it possible to easily capture gastropod organisms with a simple configuration by taking advantage of the habits of gastropod organisms.

[0024] In addition, in the gastropod organism collection device according to the present application, the guide pieces are formed in a rod or plate shape as necessary. In this way, since the guide pieces are formed in a rod or plate shape, gastropod organisms can easily walk on the guide pieces, and gastropod organisms can be easily collected by taking advantage of the habits of gastropod organisms with a simple configuration.

[0025] In addition, in the gastropod organism capturing device according to the present application, the guide piece has a barbed structure as needed. Because the guide piece has a barbed structure, once a gastropod organism has entered the end of the guide piece, an escape route is blocked, and the gastropod organism can be reliably captured with a simple configuration without losing the gastropod organism.

[0026] In addition, in the gastropod organism collection device according to the present application, the guide pieces may have an uneven surface as needed. In this way, the uneven surface of the guide pieces makes it easier for gastropod organisms to walk on the guide pieces, and the gastropod organisms can be easily collected using the habits of the gastropod organisms with a simple configuration.

[0027] In addition, in the gastropod organism collection device of the present application, if necessary, the inductor piece is selected from the group consisting of ceramic, plastic, rubber, cellulose, and resin, or is formed by applying or mixing a conductive material onto a substrate selected from the group consisting of silicon, fluororesin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal. In this way, the inductor piece is formed by applying or mixing a conductive material onto a substrate selected from the group consisting of ceramic, plastic, rubber, cellulose, and resin, or a substrate selected from the group consisting of silicon, fluororesin, ultra-high molecular weight polyethylene, monomer-cast nylon, and polyacetal. Therefore, the inductor piece, which is made of a substrate and a conductive material, is formed from a material that is easy to spawn on when ceramic, plastic, rubber, cellulose, or resin is used, and is formed from a material that is difficult to spawn on when silicon, fluororesin, ultra-high molecular weight polyethylene, monomer-cast nylon, or polyacetal is used. When a material that is easy to spawn on is used, it becomes easier to remove egg masses that have been laid on the wall surface, and when a material that is difficult to spawn on is used, the number of eggs laid on the wall surface can be reduced. Depending on the application, gastropod organisms can be captured by utilizing the habits of gastropod organisms with a simple configuration.

[0028] In addition, in the gastropod organism capture device according to the present application, the conductive material may be made of a carbon material, as needed. In this way, the conductive material is made of a carbon material, which makes it possible to reduce the weight of the inductor piece and improve its durability, thereby enabling gastropod organism capture with a simpler configuration.

[0029] Furthermore, in the gastropod organism collection device according to the present application, the substrate may be biodegradable as needed. Because the substrate is biodegradable, it will naturally decompose when disposed of, making it possible to collect gastropod organisms with a simpler configuration and with less environmental impact.

[0030] Furthermore, the gastropod organism collection device according to the present application may, as necessary, comprise a pair of opposing electrodes disposed via a medium material made of a dielectric or a conductor, the lower electrode of which is disposed near the distal end of the lead of the capture unit, and a DC power supply that outputs a DC voltage between the opposing electrodes. Thus, with the pair of opposing electrodes disposed via a medium material made of a dielectric or a conductor, the lower electrode of which is disposed near the distal end of the lead of the capture unit, and the DC power supply that outputs a DC voltage between the opposing electrodes, when a DC voltage is applied between the opposing electrodes, gastropod organisms are attracted to the vicinity of the lower electrode with a lower potential due to the phenomenon of congregating at a certain electrode (electrotaxis), and move en masse toward the vicinity of the distal end of the lead of the capture unit, thereby enabling more efficient collection of gastropod organisms near the distal end of the lead.

[0031] In addition, in the gastropod organism collection device according to the present application, the lower electrode of the counter electrodes is formed in a rod or plate shape, and the upper electrode of the counter electrodes is formed in one or more rod or plate shapes, as necessary. In this way, since the lower electrode of the counter electrodes is formed in a rod or plate shape and the upper electrode of the counter electrodes is formed in one or more rod or plate shapes, gastropod organisms are electrically attracted and gathered from all directions (360 degrees) by the rod-shaped lower electrode, and gastropod organisms can be collected more efficiently.

[0032] Furthermore, the gastropod organism collection device according to the present application is equipped with a material supply unit that supplies a material composed of organic matter and / or ferric phosphate as needed. By providing the material supply unit that supplies a material composed of organic matter and / or ferric phosphate, the gastropod organisms feed on the supplied material, thereby attracting and / or killing the gastropod organisms, thereby enabling more efficient collection of the gastropod organisms.

[0033] In addition, in the gastropod organism collection device according to the present application, the material supply unit supplies the material at a concentration that increases toward the end of the guide piece of the capture unit as needed. In this way, since the material supply unit supplies the material at a concentration that increases toward the end of the guide piece of the capture unit, gastropod organisms are naturally gathered at the end of the guide piece of the capture unit as they feed, making it possible to more efficiently collect gastropod organisms with a simple configuration.

[0034] Furthermore, the gastropod collection device according to the present application may, as necessary, include a storage section for storing gastropod organisms in a lower bottom region near the end of the guide piece of the capture unit. By providing a storage section for storing gastropod organisms in a lower bottom region near the end of the guide piece of the capture unit, gastropod organisms attracted to the lower bottom region near the end of the guide piece are stored in the storage section without escaping, thereby making it possible to more reliably capture gastropod organisms.

[0035] Furthermore, the gastropod collection device according to the present application may optionally include upper both-end fixing portions that support both upper ends of the guide piece so that the lower part of the guide piece is free to swing. As such, since the gastropods that have been electrically attracted and gathered are provided with upper both-end fixing portions that support both upper ends of the guide piece so that the lower part of the guide piece is free to swing, the guide piece has a shape that allows parts other than the upper both ends of the guide piece to easily flutter and move as the gastropods move on the guide piece, so that the gastropods can be regularly shaken off toward the storage section, making it possible to collect the gastropods more efficiently.

[0036] Furthermore, the gastropod collection device according to the present application may optionally include vibration means for intermittently vibrating the guide pieces. By including vibration means for intermittently vibrating the guide pieces, gastropods that have been electrically attracted and gathered are periodically vibrated and shaken off, allowing for more efficient collection of gastropods.

[0037] In addition, the gastropod organism occurrence detection device using the gastropod organism collection device of the present application comprises a collection means for collecting the number of gastropod organisms collected by the gastropod organism collection device, and a calculation means for calculating the occurrence distribution of the gastropod organisms per unit area based on the number of individuals collected by the collection means.

[0038] As such, the gastropod organism occurrence detection device of the present application comprises a collection means for collecting the number of gastropod organisms captured by the gastropod organism capture device, and a calculation means for calculating the occurrence distribution of the gastropod organisms per unit area based on the number of individuals collected by the collection means.Therefore, the occurrence distribution of the gastropod organisms per unit area can be calculated easily and with little sampling error from the number of gastropod organisms captured by the gastropod organism capture device, similar to a sampling survey, making it possible to predict the overall trends of gastropod organisms from a bird's eye view, and the occurrence of gastropod organisms can be detected simply and with high accuracy.

[0039] Furthermore, in the gastropod organism occurrence detection device according to the present application, the calculation means, as necessary, predicts the occurrence of gastropod organisms for the following year from the correlation between the occurrence distribution per unit area calculated by the calculation means and the climatic conditions of the winter of the current year, based on the number of individuals for the current year collected by the collection means. In this way, the calculation means predicts the occurrence of gastropod organisms for the following year from the correlation between the occurrence distribution per unit area calculated by the calculation means and the climatic conditions of the winter of the current year, based on the number of individuals for the current year collected by the collection means. Therefore, the occurrence status of gastropod organisms for the current year and the habitat conditions of gastropod organisms that overwinter and grow can be comprehensively determined based on the number of individuals collected from spring to autumn of the current year and the climatic conditions of the winter when gastropod organisms hibernate, making it possible to predict the occurrence status of gastropod organisms for the following year with even greater accuracy.

[0040] In addition, in the gastropod infestation detection device according to the present application, the collection means collects the number of gastropod organisms at each growth stage of the growing plant, the calculation means calculates the distribution of infestation per unit area for each growth stage, and performs field management for the next growth stage based on the calculated data on the distribution of infestation for the previous growth stage, as necessary. In this way, the collection means collects the number of gastropod organisms at each growth stage of the growing plant, the calculation means calculates the distribution of infestation per unit area for each growth stage, and performs field management for the next growth stage based on the calculated data on the distribution of infestation for the previous growth stage. Therefore, it is possible to accurately predict how to proceed with field management for the next growth stage from the data on the distribution of infestation per unit area calculated from the number of gastropod organisms collected at each growth stage of the growing plant, and it is possible to accurately and easily support field management for the next growth stage without relying on experience or intuition.

[0041] Furthermore, in the gastropod organism occurrence detection device according to the present application, the field management is shallow water management and / or pesticide management as necessary. In this way, since the field management is shallow water management and / or pesticide management, it is possible to accurately predict the optimal shallow water management and / or pesticide management procedure for the next growth stage, which varies from year to year, based on data on the occurrence distribution of the previous growth stage, and it is possible to support the optimal shallow water management and / or pesticide management for the next growth stage accurately and easily without relying on experience or intuition.

[0042] Furthermore, the gastropod organism occurrence detection device according to the present application may, as necessary, be provided with a display means for displaying the calculation results of the calculation means in a message app on an external terminal equipped with a message app. In this way, since the external terminal equipped with a message app is provided with a display means for displaying the calculation results of the calculation means in the message app, the occurrence distribution of gastropod organisms per unit area calculated by the calculation means can be updated each time and displayed in the message app, making it possible to know the latest overall trends of gastropod organisms at any time, thereby improving the accuracy and usability of gastropod organism occurrence predictions.

[0043] Furthermore, a gastropod extermination device using the gastropod collection device according to the present application includes an ultrasonic generator disposed near the bottom surface of the distal end of the guide piece and generating ultrasonic vibrations. Because the ultrasonic generator is disposed near the bottom surface of the distal end of the guide piece and generates ultrasonic vibrations, ultrasonic vibrations are concentrated on the gastropods gathered at the distal end of the guide piece, making it possible to exterminate the gastropods efficiently and reliably.

[0044] Furthermore, a gastropod extermination device using the gastropod collection device according to the present application may also include a vibration reflector, as necessary, having a flat or curved shape, disposed on the upper surface of the capture unit, and reflecting or propagating the ultrasonic vibrations generated by the ultrasonic generator. Since the device includes a vibration reflector, having a flat or curved shape, disposed on the upper surface of the capture unit, and reflecting or propagating the ultrasonic vibrations generated by the ultrasonic generator, when gastropods are gathered below the vibration reflector, the ultrasonic vibrations generated by the ultrasonic generator are reflected and amplified toward the lower part of the vibration reflector without escaping to the upper part by the vibration reflector, and when gastropods are gathered above the vibration reflector, the vibration reflector also functions as a platform for the gastropods, and the ultrasonic vibrations are propagated in a concentrated manner to the gathered gastropods, thereby more reliably exterminating the gastropods.

[0045] Furthermore, in the gastropod extermination device according to the present application, the guide piece is configured to be inclined with respect to the vertical plane as necessary. Because the guide piece is configured to be inclined with respect to the vertical plane, the guide piece reflects upward ultrasonic vibrations downward, and the ultrasonic vibrations are irradiated on the gastropods gathered below, thereby more reliably exterminating the gastropods.

[0046] In addition, in the gastropod extermination device according to the present application, the inside of the container is configured with a parabolic mirror as needed. Because the inside of the container is configured with a parabolic mirror, the ultrasonic vibrations reflected inside the container are focused at a specific focal point, and the ultrasonic vibrations can be significantly amplified and increased in density, making it possible to more reliably exterminate gastropods.

[0047] FIG. 1 shows a configuration diagram of a gastropod organism capturing device according to a first embodiment of the present invention. FIG. 2 shows an explanatory diagram explaining the capturing operation of the gastropod organism capturing device according to the first embodiment of the present invention. FIG. 3 shows a configuration diagram of a gastropod organism capturing device according to the first embodiment of the present invention. FIG. 4 shows a configuration diagram of a gastropod organism capturing device according to a third embodiment of the present invention. FIG. 5 shows an explanatory diagram explaining the capturing operation of the gastropod organism capturing device according to the third embodiment of the present invention. FIG. 6 shows a configuration diagram of a gastropod organism capturing device according to the third embodiment of the present invention. FIG. 7 shows an explanatory diagram of an example of voltage fluctuations in the gastropod organism capturing device according to the third embodiment of the present invention. FIG. 8 shows a configuration diagram of a gastropod organism capturing device according to the third embodiment of the present invention. FIG. 9 shows an explanatory diagram of the concentration gradient of materials in the gastropod organism capturing device according to the third embodiment of the present invention. FIG. 10 shows a configuration diagram of a gastropod organism capturing device according to a fifth embodiment of the present invention. FIG. 11 shows a configuration diagram of a gastropod organism capturing device according to the fifth embodiment of the present invention. FIG. 12 shows a configuration diagram of a gastropod organism capturing device according to the sixth embodiment of the present invention. FIG. 13 shows a configuration diagram of a gastropod organism capturing device according to another embodiment of the present invention. 1 shows a configuration diagram of a gastropod extermination device according to another embodiment of the present invention. FIG. 1 shows a configuration diagram of a gastropod extermination device according to another embodiment of the present invention. FIG. 1 shows a configuration diagram of a gastropod extermination device according to another embodiment of the present invention. FIG. 2 shows the results of attracting gastropod organisms to a collection device according to Example 1. FIG. 3 shows the conditions for attracting gastropod organisms to a collection device according to Example 2. FIG. 4 shows the results of attracting gastropod organisms to a collection device according to Example 3. FIG. 5 shows the results of attracting gastropod organisms to a collection device according to Example 4. FIG. 6 shows the conditions for attracting gastropod organisms to a collection device according to Example 5. FIG. 7 shows the results of attracting gastropod organisms to a collection device according to Example 6. FIG. 8 shows the results of attracting gastropod organisms to a collection device according to Example 7. FIG. 9 shows the results of attracting gastropod organisms to a collection device according to Example 8. FIG. 10 shows the results of attracting gastropod organisms to a collection device according to Example 9.

[0048] (First embodiment) As shown in Figures 1(a) and (b), a gastropod organism collection device according to the first embodiment is a gastropod organism collection device that collects gastropod organisms 100, and is equipped with a capture unit 1 to which a plurality of guide pieces 11 are radially arranged and to which the end ends 11b of the guide pieces 11 are fixed and which has an opening 1a between the tip ends 11a of the guide pieces 11, and the opening 1a of the capture unit 1 is formed to be larger than the maximum outer diameter dimension of the target species of gastropod organisms 100.

[0049] 1(a) and 1(b), a support part 12 is provided that bundles and supports and fixes a plurality of guide pieces 11 near their respective end parts 11b. Depending on the application, a rod-shaped support rod 12a is provided that connects to the support part 12. The support rod 12a enhances portability and makes it easy to carry.

[0050] 1(a) and 1(b), a support part 12 is provided that bundles and supports and fixes a plurality of guide pieces 11 near their respective end parts 11b. Depending on the application, a rod-shaped support rod 12a is provided that connects to the support part 12. The support rod 12a enhances portability and makes it easy to carry.

[0051] In addition, a frame body for fixing the plurality of induction pieces 11 is provided, which is an induction piece support part 13 consisting of an induction piece tip support part 13a that supports the tip end 11a of the induction piece 11, and an induction piece intermediate support part 13c that supports the intermediate position between the tip end 11a and the end end 11b of the induction piece 11.

[0052] The gastropod organisms 100 targeted by this collection device include, but are not limited to, pests such as giant apple snails (Pomacea canaliculata), golden apple snails, slugs, small-leaved land snails, and snails, but it is particularly preferable to target giant apple snails, which are an extremely dangerous invasive alien species. Giant apple snails live in rice paddies and have a habit of feeding on young rice seedlings, causing severe damage to rice harvests, making their effective and thorough eradication an urgent issue.

[0053] The induction piece 11 has a fragmented shape and can be made of, for example, resin.

[0054] The radial arrangement of the multiple induction pieces 11 is achieved by fixing the end portions 11b of the multiple induction pieces 11 together, and a shape is formed in which the width between each induction piece 11 increases as the multiple induction pieces 11 move toward the spaces between the respective tip portions 11a.

[0055] The method for fixing the end portion 11b of each guide piece 11 to the guide piece support portion 13, which is the frame body, is not particularly limited, but for example, fixing using an adhesive or fixing using fitting is possible.

[0056] A plurality of guide pieces 11 are radially arranged to form a shape that resembles the roots of rice plants. For example, in the same way that fish gather around fishing reefs in seawater, the gastropods 100 have the tendency to walk around targeting rice plants, so that the gastropods 100 can be easily attracted to the guide pieces 11 and captured.

[0057] As shown in Fig. 1(c), the capture unit 1 has an opening 1a formed between the tip ends 11a of the guide pieces 11. The size L of this opening 1a is set to be larger than the maximum outer diameter M of the target species of gastropod organism 100, as shown in Fig. 1(d).

[0058] For example, in the case of a giant snail, which is a type of gastropod organism 100, the maximum shell height of an adult is about 80 mm, so the maximum outer diameter dimension M can be set to 80 mm, and the size L of the opening 1a can be set to 100 mm. With this configuration, the gastropod organism 100 can freely enter toward the end portion 11b of the guide piece 11.

[0059] With this configuration, as shown in Figure 2, the size and shape of the opening 1a of the capture unit 1 make it easy for individual gastropod organisms 100 to enter without crowding, and the radially formed guide pieces 11 allow gastropod organisms 100 to enter up to the end 11b of the guide pieces 11 from all directions, 360 degrees, making it possible to easily capture gastropod organisms 100 using a simple configuration and taking advantage of the habits of the gastropod organisms 100.

[0060] More preferably, the guide piece 11 can be formed in a rod or plate shape. The guide piece 11 formed in a rod or plate shape has a shape similar to the root of cultivated rice, and therefore the gastropod organisms 100 can easily approach it due to their tendency to approach the rice.

[0061] When the guide piece 11 is plate-shaped, it may have any shape, including, but not limited to, a trapezoidal, rectangular, diamond, square, parallelogram, circular, and elliptical shape. When the guide piece 11 is plate-shaped, a large area is formed on which the gastropod organisms 100 can walk, so that the gastropod organisms 100 that have entered the guide piece 11 can be reliably captured without escaping.

[0062] When the induction piece 11 is rod-shaped, it may be, for example, a straight rod as shown in Fig. 3(a), although there is no particular limitation to this. Alternatively, it may be a bent rod.

[0063] Since the guide piece 11 is formed in a rod or plate shape in this manner, it becomes easier for the gastropod organisms 100 to walk on this guide piece 11, and the gastropod organisms 100 can be easily captured using a simple configuration by taking advantage of the habits of the gastropod organisms 100.

[0064] It is also preferable that the induction piece 11 has a return structure.

[0065] As shown in Figure 3(b), this return structure can be configured as a folded portion 11c consisting of an L-shaped protrusion disposed at the opening 1a of the capture unit 1. This folded portion 11c blocks the exit that would serve as an escape route if the gastropod organism 100 that has entered the end portion 11b of the guide piece 11 attempts to escape to the outside, and the gastropod organism 100 can be reliably captured with a simple configuration without losing the gastropod organism 100.

[0066] In addition, the return structure can also be configured as a protrusion return portion 11d consisting of one or more protrusions arranged along the surface of the guide piece 11, rising at an acute angle in a direction A toward the end portion 11b of the guide piece 11, as shown in Figure 3(c).

[0067] The gastropod organism 100 can proceed without obstacle in direction A toward the end 11b of the guide piece 11, but in direction B toward the tip 11a of the guide piece 11, the protruding return portion 11d becomes an obstacle and the gastropod organism 100 cannot turn back, so that the gastropod organism 100 can be reliably captured with a simple configuration without missing it.

[0068] 3(d), the above-mentioned return structure of the folded portion 11c and the protruding folded portion 11d can be combined. With this configuration, the gastropod organism 100 that has entered the distal end 11b of the guide piece 11 is unable to return because the protruding folded portion 11d becomes an obstacle, and the exit that would otherwise be an escape route is blocked by the folded portion 11c, making it possible to reliably capture the gastropod organism 100 without losing it with a simple configuration.

[0069] 3(e), an uneven portion 11e having an uneven shape can be formed on the surface of the guide piece 11. The uneven portion 11e can be formed by processing the surface of the guide piece 11 using a known processing technique, for example, by embossing or debossing.

[0070] Since the guide piece 11 has an uneven surface, it becomes easier for the gastropod organisms 100 to walk on the guide piece 11 and it also prevents the gastropod organisms 100 from falling off and escaping, so that the gastropod organisms 100 can be easily and reliably captured with a simple configuration.

[0071] The height of the guide pieces 11 is not particularly limited and can be freely set depending on the installation location, but when used in a rice paddy, for example, it is preferable that the height of the guide pieces 11 is at least higher than the water level of the rice paddy. This height of the guide pieces 11 makes it possible to capture gastropods more efficiently without missing any that gather there.

[0072] Second Embodiment The gastropod organism collection device according to the second embodiment includes the capture unit 1, as in the first embodiment, and further includes the inductor piece 11, which is selected from the group consisting of ceramic, plastic, rubber, cellulose, and resin, or is configured by applying or mixing a conductive material onto a substrate selected from the group consisting of silicon, fluororesin, ultra-high molecular weight polyethylene, monomer-cast nylon, and polyacetal.

[0073] When the guide piece 11 is made of a base material selected from the group consisting of ceramic, plastic, rubber, cellulose, and resin, it is made of a material that is easy for spawning to occur. On the other hand, when the guide piece 11 is made of a base material selected from the group consisting of silicone, fluororesin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal, it is made of a material that is difficult for spawning to occur. The base material of the guide piece 11 can be selected depending on the purpose and application.

[0074] The application of the conductive material means spreading the conductive material on the surface of the substrate, and any known method can be used. For example, the conductive material can be applied to the surface of the substrate by spray coating, dispenser coating, roll coating using a roller, brush coating, or dip coating.

[0075] The kneading of the conductive material means to uniformly disperse the conductive material in the base material, and a known method can be used. For example, the base material and the conductive material, which are dry-blended as raw materials, can be melted and kneaded.

[0076] In this way, the inductor piece 11 is formed by applying or mixing a conductive material onto a substrate selected from the group consisting of ceramic, plastic, rubber, cellulose, and resin, or a substrate selected from the group consisting of silicon, fluororesin, ultra-high molecular weight polyethylene, monomer-cast nylon, and polyacetal. Therefore, when ceramic, plastic, rubber, cellulose, or resin is used, the inductor piece 11 is formed from a material that is easy for the organisms to lay eggs on. When silicon, fluororesin, ultra-high molecular weight polyethylene, monomer-cast nylon, or polyacetal is used, the inductor piece 11 is formed from a material that is difficult for the organisms to lay eggs on. When a material that is easy for the organisms to lay eggs on is used, it becomes easier to remove egg masses that have been laid on the wall surface. When a material that is difficult for the organisms to lay eggs on the wall surface is used, the number of eggs laid on the wall surface can be reduced. Depending on the application, the behavior of the gastropod organisms 100 can be utilized to capture the gastropod organisms 100 with a simple configuration.

[0077] More preferably, the conductive material is made of a carbon material. Since the conductive material is made of a carbon material, the inductor piece 11 can be made lighter and more durable, and gastropod organisms 100 can be captured with a simpler structure.

[0078] The carbon material is not particularly limited, but may be selected from the group consisting of carbon nanotubes, carbon nanofibers, graphite, graphene, and carbon black. Such fine carbon materials can further reduce the weight and improve the durability of the guide piece 11, making it possible to capture gastropod organisms 100 with a simpler and more robust structure.

[0079] It is also preferable that the substrate is biodegradable. There is no particular limitation on the biodegradable substrate, but examples thereof include biodegradable plastics and biomass plastics.

[0080] Since the substrate is biodegradable in this way, it will naturally decompose when disposed of, making it possible to capture gastropod organisms 100 with a simpler configuration and with reduced environmental impact.

[0081] (Third embodiment) A gastropod organism capture device according to a third embodiment includes the capture unit 1 as in the first embodiment, and further includes a pair of opposing electrodes 2 disposed via a medium material made of a dielectric or a conductor, as shown in FIG. 4( a), in which the lower electrode 21 of the opposing electrodes 2 is disposed near the end portion 11 b of the inductor piece 11 of the capture unit 1, and a DC power supply 3 that outputs a DC voltage between the opposing electrodes 2.

[0082] This medium material provides electrical conduction between the opposing electrodes 2. The dielectric or conductor constituting this medium material is not particularly limited, but water, for example, can be used. That is, paddy field water can be used as is as this medium material, so the gastropod organism collection device according to this embodiment can be installed by directly placing it in a paddy field.

[0083] The shape of the counter electrode 2 is not particularly limited, and a wide range of commonly used electrode materials can be used, but if use is limited to a short period of time, iron or aluminum, which corrodes and dissolves in water, can be used to eliminate the effort of recovery. For long-term use, electrode materials that do not corrode, such as platinum or carbon, are preferred. The counter electrode 2 can be of any shape as long as it can provide an electric field gradient.

[0084] The counter electrode 2 is arranged so that at least one high-level electrode 22 faces at least one low-level electrode 21. The low-level electrode 21 is disposed near the distal end 11b of the induction piece 11 of the capture part 1, but the number and location of the high-level electrodes 22 are not particularly limited.

[0085] For example, the counter electrode 2 can be configured such that one or more upper electrodes 22 are disposed relative to one lower electrode 21. Furthermore, when multiple gastropod collection devices according to this embodiment are installed, one or more upper electrodes 22 can be disposed relative to multiple lower electrodes 21.

[0086] In this way, the opposing electrode 2 allows for flexible electrode arrangement of the lower electrode 21 and the upper electrode 22 depending on the habitat area and shape of the gastropod organisms 100, allowing the gastropod organisms 100 to be optimally captured depending on their occurrence conditions.

[0087] The DC power supply 3 applies a DC voltage between the opposing electrodes 2. This applied voltage may be either positive or negative with respect to the ground potential, and an electric field may be generated from the high-level electrode 22 to the grounded electrode by grounding the low-level electrode 21, an electric field may be generated from the grounded electrode to the low-level electrode 21 by grounding the high-level electrode 22, or an electric field may be generated from the high-level electrode 22 to the low-level electrode 21 without grounding the high-level electrode 22 or the low-level electrode 21.

[0088] The DC power supply 3 that generates this DC voltage is not particularly limited, but an electric field from 1 V / m onwards can be used, in which case solar power generation is also possible. Furthermore, when the electrode spacing is 1.2 m, for example, the applied voltage is preferably 3 to 10 V, which is the range in which the gastropod organisms 100 begin to move towards lower voltages, and is preferably 5 V, in particular, from the viewpoint that the gastropod organisms 100 begin to move most actively towards lower voltages.

[0089] In this way, by applying a DC voltage between the opposing electrodes 2, the gastropod organisms 100 are attracted to the lower electrode with a lower potential based on the phenomenon of gathering at a certain electrode (electrotaxis), as shown in Figure 4 (b), and move all at once toward the vicinity of the end 11b of the induction piece 11 of the capture unit 1, thereby making it possible to more efficiently capture the gastropod organisms 100 near the end 11b of the induction piece 11.

[0090] An insulating sheet or insulating plate made of an insulator can also be laid below the installed low-side electrode 21 and / or high-side electrode 22. For example, as shown in Fig. 4(c), a low-side insulating plate 21a made of an insulator can be laid below the low-side electrode 21, and a high-side insulating plate 22a made of an insulator can be laid below the high-side electrode 22.

[0091] In this way, by insulating the lower area of ​​each electrode with an insulating plate, it is possible to prevent current from flowing to the ground, thereby reducing the loss of electrical energy and enabling collection to be performed more efficiently over a wider collection range.

[0092] The arrangement of the low-side insulating plate 21 a and the high-side insulating plate 22 a is not limited to the arrangement in which they are laid under all of the electrodes as described above, but can be freely arranged depending on the application, location, etc. For example, the low-side insulating plate 21 a may be laid only under the low-side electrode 21, or the high-side insulating plate 22 a may be laid only under the high-side electrode 22.

[0093] The shape of the counter electrode 2 is not particularly limited, but more preferably, the lower electrode 21 is formed in a rod or plate shape, and the higher electrode 22 is formed in one or more rod or plate shapes. The higher electrode 22 can be formed in a rod or plate shape depending on the size and shape of the target area, and can be arranged in one or more.

[0094] Furthermore, when the lower electrode 21 and the upper electrode 22 are formed in a rod-like and / or plate-like shape, it is possible to place these electrodes so that they are raised above the ground and use a holder 22b as a holding device that holds the electrodes from both sides, as shown in Figure 4(d). By holding the electrodes with the holder 22b, the rod-like or plate-like electrodes can be stably installed so that they do not fall over, and because they are placed so that they are raised above the ground, the lower areas of the electrodes can be insulated, thereby further expanding the range of gastropod organisms 100 that can be captured.

[0095] When the low-side electrode 21 and the high-side electrode 22 are formed in a rod shape and / or a plate shape, there is no particular limitation, but for example, as shown in Fig. 5(a), the low-side electrode 21 of the counter electrode 2 may be formed in a rod shape and the high-side electrode 22 of the counter electrode 2 may be formed in a plate shape. Alternatively, the low-side electrode 21 may be formed in a plate shape and the high-side electrode 22 may be formed in a rod shape.

[0096] Because the lower electrode 21 of the counter electrodes 2 is a rod-shaped rod electrode, the gastropod organism collection device according to this embodiment has a shape in which a plurality of induction pieces 11 are formed radially from the rod electrode. Because gastropod organisms 100 tend to gather around the lower electrode 21, the gastropod organisms 100 are attracted to the vicinity of the rod electrode as shown in Fig. 5(b), and form a shape in which they remain at the end 11b of the induction piece 11 as shown in Fig. 5(c).

[0097] Furthermore, when targeting a large body of water such as a rice paddy, by providing multiple pairs of rod-shaped and / or plate-shaped lower electrodes 21 and upper electrodes 22, as shown in Figure 6 (a), it is possible to collect gastropod organisms 100 evenly throughout the entire body of water.

[0098] For example, in an application example to a rice paddy, as shown in Fig. 6(b), a rod-shaped high-side electrode 22 is compact and easy to install, and therefore can be installed along the ridge 201 of a rice paddy 200. In addition to the multiple high-side electrodes 22 installed along the ridge 201, multiple low-side electrodes 21, for example, about 10, can also be installed within the rice paddy 200.

[0099] By grounding (connecting to the earth) one of these higher electrodes 22, current can be passed evenly throughout the rice paddy 200, and current can be passed easily and reliably simply by placing a rod-shaped or plate-shaped lower electrode 21 in the rice paddy 200.

[0100] In this way, the lower electrode 21 of the opposing electrode 2 is formed in a rod shape, and the higher electrode 22 of the opposing electrode 2 is formed in one or more rod or plate shapes, so that the rod-shaped lower electrode 21 electrically attracts and gathers the gastropod organisms 100 from all directions, 360 degrees, allowing the gastropod organisms 100 to be captured even more efficiently.

[0101] The DC power supply 3 can also operate so that the DC voltage it outputs is intermittent. As shown in Figure 7(a) , the rectangular wave changes regularly as the time on the horizontal axis progresses, with the voltage on the vertical axis alternating from A (low level) to B (high level) and back again.

[0102] This change can be either positive or negative with respect to ground potential, and can be within a range of either positive or negative with respect to ground potential, as shown in Figure 7(a) and (b), but can also alternate between positive and negative ranges with respect to ground potential, as shown in Figure 7(c).

[0103] In addition, an electric field may be generated from the high-side electrode 22 to the low-side electrode 21 by grounding the low-side electrode 21, or an electric field may be generated from the grounded electrode to the low-side electrode 21 by grounding the high-side electrode 22, or an electric field may be generated from the high-side electrode 22 to the low-side electrode 21 without grounding the high-side electrode 22 or the low-side electrode 21.

[0104] By applying a voltage intermittently between the opposing electrodes 2 by the DC power supply 3, it is possible to prevent electrolytes from accumulating and adhering to the electrode surface over time, compared to when a DC voltage is applied continuously and uninterruptedly. This not only reduces power consumption, but also prevents the electric field from becoming difficult to apply over time due to deterioration, making it possible to capture gastropod organisms 100 more efficiently and at lower cost.

[0105] The shapes of the capture part 1 and the counter electrode 2 are not limited to those described above. For example, the lower electrode 21 is not particularly limited as long as it is disposed near the end 11b of the lead piece 11 of the capture part 1. For example, as shown in Figure 7(d), the capture part 1 formed by the lead piece 11 can have a semicircular shape, and the lower electrode 21 can be formed in a plate shape along the rectangular end surface 1b of the capture part 1. If the capture part 1 has a semicircular shape, it can be placed on the inner wall or corner (four corners) of a paddy field, which broadens the range of uses depending on the application.

[0106] In addition, in the above, the low-level electrode 21 and the high-level electrode 22 are distinguished as separate bodies, but this is not limited to this, and it is also possible to connect the low-level electrode 21 and the high-level electrode 22 by switching the polarity.

[0107] For example, in the configuration of the semicircular capture unit 1 and plate-like lower electrode 21 shown in Fig. 7(d) above, as shown in Fig. 7(e), a similar semicircular capture unit 1 and plate-like upper electrode 22 can be arranged, and a polarity switching control unit 31 can be provided that controls switching of the polarity of the DC power supply 3 that supplies current between these counter electrodes 2. This polarity switching control unit 31 allows the polarity of the electrodes to be flexibly switched in accordance with the ever-changing capture conditions, enabling more efficient capture of gastropod organisms 100.

[0108] (Fourth embodiment) The gastropod organism collection device according to the fourth embodiment comprises the capture unit 1, the counter electrode 2, and the DC power supply 3, similar to the third embodiment, and further comprises a material supply unit 4 that supplies a material 41 composed of organic matter and / or ferric phosphate, as shown in Figure 8.

[0109] The organic matter that can constitute the material 41 is not particularly limited as long as it contains carbon atoms, and examples thereof include sugars, fish food, etc. This organic matter is a food source for the gastropod organisms 100, including the giant pond snail.

[0110] This material 41 can be composed of ferric phosphate (FePO ４ ) is a naturally occurring component, and as an agent with low environmental impact, it can be effective in exterminating gastropod organisms 100, including giant pond snails.

[0111] This material 41 can be composed of only organic matter, or it can be composed of only ferric phosphate, or it can be composed of a mixture of organic matter and ferric phosphate.

[0112] The DC power supply 3 is also capable of stopping the voltage application when the gastropod organisms 100 are attracted to the lower electrode 21 and reach the material 41. This allows the attraction by the material 41 and the electric attraction to work in a complementary manner, enabling more efficient attraction.

[0113] In this way, since the material supply unit 4 that supplies the material 41 composed of organic matter and / or ferric phosphate is provided, the gastropod organisms 100 feed on the supplied material 41, thereby attracting and / or killing the gastropod organisms 100, thereby making it possible to more efficiently capture the gastropod organisms 100. In other words, when the material 41 contains ferric phosphate, the gastropod organisms 100 can be effectively captured by using both electrical attraction by the counter electrode 2 and the ferric phosphate agent in a superimposed manner.

[0114] More preferably, as shown in Fig. 9(a), the material supply unit 4 supplies the material 41 at a concentration that increases toward the distal end 11b of the guide piece 11 of the capture unit 1. There are no particular limitations on the concentration gradient of the material 41, but, for example, as shown in Fig. 9(b), it is possible to increase the concentration by gradually increasing the amount of material 41 from the opening 1a of the guide piece 11 to the distal end 11b. Alternatively, as shown in Fig. 9(c), it is also possible to concentrate the material 41 only at the distal end 11b of the guide piece 11.

[0115] In this way, the material supply unit 4 supplies the material 41 at a higher concentration toward the end 11b of the guide piece 11 of the capture unit 1, so that as the gastropod organisms 100 carry out their feeding behavior, the gastropod organisms 100 are naturally gathered at the end 11b of the guide piece 11 of the capture unit 1, making it possible to capture the gastropod organisms 100 more efficiently with a simple configuration.

[0116] (Fifth embodiment) The gastropod organism collection device according to the fifth embodiment comprises a capture unit 1, a counter electrode 2, and a DC power supply 3, as in the third embodiment, and further comprises a storage unit for storing gastropod organisms 100 in the lower bottom area near the end 11b of the induction piece 11 of the capture unit 1, as shown in Figure 10.

[0117] 10(a), the container 5 is configured as a collection vessel in which a lower electrode 21 is disposed on the central axis. The lower electrode 21 is electrically connected to the higher electrode 22.

[0118] The area under the bottom surface near the distal end 11b of the guide piece 11 of the capture unit 1 is not particularly limited as long as it includes at least the area directly below the distal end 11b of the guide piece 11. The storage unit 5 is not particularly limited as long as it can store the gastropod organism 100, and can be, for example, a mesh container or a bowl-shaped container made of resin or metal.

[0119] This collection container has an opening 1a with an open top, and can be provided with a net 51 that stretches from the opening 1a along the inner periphery of the interior, spacing the periphery of the lower electrode 21. The net 51 can be made of a material such as synthetic resin or metal. By disposing the net 51 at the opening 1a, which is the entrance for the gastropod organisms 100, it is possible to prevent the gastropod organisms 100 from dispersing.

[0120] The collection container also includes a lid 52 that secures the top while keeping the top open. This collection container can be buried in the soil and installed anywhere, making it highly easy to install. For example, in paddy fields, it can be buried in the soil of the paddy and installed in any location and in any number. In other words, it is easy to install in the field and handle, making it easy to install on site.

[0121] In this way, the capture unit 1 is provided with a storage section 5 for storing gastropod organisms 100 in the lower bottom area near the end 11b of the guide piece 11, so that the gastropod organisms 100 attracted to the lower bottom area near the end 11b of the guide piece 11 are stored in the storage section 5 without escaping, thereby making it possible to capture the gastropod organisms 100 more reliably.

[0122] As shown in FIG. 10(b), the guide piece 11 may also be provided with upper both end fixing portions 11f that support both upper ends of the guide piece 11 so that the lower portion of the guide piece 11 is swingable.

[0123] 10(b), the upper both-end fixing portion 11f can be formed by fixing the guide piece 11 to the guide piece tip support portion 13a and the guide piece end support portion 13b. By fixing both upper ends, which are part of the guide piece 11, the areas of the guide piece 11 other than the upper both ends are loosely fixed and can move easily.

[0124] In this way, as the electrically attracted and gathered gastropod organisms 100 move on the guide piece 11, parts of the guide piece 11 other than the upper two ends thereof flutter freely in the swinging direction C shown in Figure 10 (b), so that the gastropod organisms 100 are periodically shaken out toward the storage section 5 below the guide piece 11 without the need for an external driving force, and the gastropod organisms 100 can be collected more efficiently.

[0125] In addition, it is possible to provide a vibration means for intermittently vibrating the induction piece 11. This vibration means can use ultrasonic vibrations or the like that are generated using an external power source.

[0126] The intermittent vibration means that the induction piece 11 is vibrated at regular intervals (fixed periods), for example, every five seconds.

[0127] In this way, since the guide piece 11 is provided with a vibration means for intermittently vibrating it, the gastropod organisms 100 that have been attracted and gathered together electrically are periodically vibrated and shaken off, and the gastropod organisms 100 can be collected more efficiently.

[0128] A specific collection operation of this embodiment based on the above configuration will now be described.

[0129] First, the counter electrode 2 is immersed in a rice paddy. The DC power supply 3 applies a DC voltage between the counter electrodes 2. After this application, the gastropod organisms 100 are attracted to the vicinity of the lower electrode 21 in accordance with their tendency to gather in areas with lower electric potentials.

[0130] The storage unit 5 stores gastropod organisms 100 that are attracted to the vicinity of the lower electrode 21. When a direct current voltage is applied from the counter electrode 2, the storage unit 5 can capture and collect the gastropod organisms 100 that move in the direction of lower potential by using a net 51 stretched around the lower electrode 21. This prevents the gastropod organisms 100 from escaping, allowing the gastropod organisms 100 to be captured more efficiently.

[0131] Furthermore, the distance between the opposing electrodes 2 is not particularly limited, but can be, for example, 1 m or more, and it is more preferable that a DC voltage of 20 to 50 V is applied between the opposing electrodes 2 for 10 minutes or more.

[0132] In this way, in this embodiment, a direct current flows between the opposing electrodes 2, and the gastropod organisms 100 are attracted to the vicinity of the lower electrode 21 in accordance with their tendency to gather in the direction of lower potential, thereby enabling the gastropod organisms 100 to be efficiently captured.

[0133] 11(a), the lower part of the induction piece 11 (the upper part of the lid 52) may be provided with a support rod 12a with a portion cut out or a disk-shaped notched plate 52a with the lower electrode 21 as its axis. Furthermore, a motor 53 for rotating the notched plate 52a and a motor control unit 53a for controlling the rotation of the motor 53 may be provided. As shown in the cross-sectional view of FIG. 11(b), the notched plate 52a has a surface D with a portion cut out at the lower part of the induction piece 11.

[0134] With this configuration, as shown in Figure 11 (c), the cutout surface D of the cutout flat plate 52a exists as an area with an angle α, and as this cutout surface D rotates and moves due to the driving of the motor 53, the gastropod organisms 100 captured on the guide piece 11 at the top of the cutout surface D fall sequentially into the net 51.

[0135] The motor control unit 53a can also control the motor 53 to alternately rotate at a predetermined angle (for example, 60 degrees) and stop. With this control, when the motor 53 stops, the rotation of the notched flat plate 52a is braked, causing vibrations in the notched flat plate 52a. In other words, the intermittent vibrations cause the gastropod organisms 100 to fall toward the storage unit 5, making it possible to capture the gastropod organisms 100 more efficiently.

[0136] Sixth Embodiment A gastropod organism occurrence detection device can also be configured using the gastropod organism collection device described in each of the above embodiments. As an example, the sixth embodiment, as shown in Figure 12, is configured to include collection means 6 that counts the number of gastropod organisms collected by the gastropod organism collection device described in the third embodiment, and calculation means 7 that calculates the occurrence distribution of the gastropod organisms per unit area based on the number of individuals collected by the collection means 6.

[0137] The collection means 6 collects the number of gastropod organisms attracted to the vicinity of the lower electrode 21 after the voltage application. The collection means 6 can be configured as a collection container in which the lower electrode 21 is arranged on the central axis, as shown in FIG. 10 above. The collection container has an opening with an open top, and a net 51 is arranged at the opening, which serves as an entrance for gastropod organisms, and stretches from the opening along the inner periphery of the lower counter electrode 2 at a distance, thereby preventing the dispersal of gastropod organisms. The collection container can be buried in soil and can be installed anywhere, making it easy to install.

[0138] The calculation means 7 comprises a distribution calculation unit 71 that calculates the number of individuals collected by the collection means 6, and a prediction calculation unit 72 that performs calculations to predict the occurrence distribution of the gastropod organisms per unit area.

[0139] This distribution calculation unit 71 can calculate the number of gastropod organisms per unit area within the collection means 6 (for example, within the collection container) from the number of gastropod organisms attracted to the vicinity of the lower electrode 21.

[0140] The specific operation of this embodiment based on this configuration will now be described.

[0141] The collection means 6 collects the number of gastropod organisms attracted to the vicinity of the lower electrode 21 according to the third embodiment. When the collection means 6 is configured as the collection container, gastropod organisms that move in the direction of lower potential due to the application of a DC voltage from the counter electrode 2 can be captured and collected in a net 51 stretched around the lower counter electrode 2. This prevents gastropod organisms from escaping, improving the accuracy of counting the number of gastropod organisms.

[0142] After this collection, the calculation means 7 calculates the occurrence distribution of gastropod organisms per unit area from the number of individuals collected in the collection step. Specifically, the population number calculation unit calculates the number of individuals collected by the collection means 6. In this calculation, the number of gastropod organisms 100 attracted to the vicinity of the lower electrode 21 can be measured by counting by an observer or by automatic measurement using an AI camera.

[0143] Next, the distribution prediction calculation unit 72 performs a calculation to predict the occurrence distribution of this gastropod organism per unit area based on the calculation by the population calculation unit.

[0144] In this way, based on the phenomenon of gastropod organisms gathering around certain electrodes (electrotaxis), the occurrence distribution of gastropod organisms per unit area can be calculated easily and with little sampling error from the number of gastropod organisms attracted near the lower electrode 21, similar to a sampling survey, making it possible to predict the overall trends of gastropod organisms from a bird's eye view, and the occurrence of gastropod organisms can be detected simply and with high accuracy.

[0145] In addition, the calculation means 7 can also calculate the distribution of occurrence of gastropod organisms per unit area based on the number of gastropod organisms collected by the collection means 6 and the inter-electrode distance between the pair of opposing electrodes 2.

[0146] By taking into consideration the inter-electrode distance between the pair of opposing electrodes 2, for example, when the inter-electrode distance is small, the gastropod organisms are more likely to be collected by the collection means 6, and the calculation results of the calculation means 7 tend to be calculated as a higher occurrence distribution per unit area than for the entire paddy field, so the calculation results are corrected to a lower value. Also, for example, when the inter-electrode distance is large, the gastropod organisms are more likely to be collected by the collection means 6, and the calculation results of the calculation means 7 tend to be calculated as a lower occurrence distribution per unit area than for the entire paddy field, so the calculation results are corrected to a higher value.

[0147] In this way, by predicting and calculating the occurrence distribution while simultaneously taking into account the number of gastropod organisms attracted to the vicinity of the lower electrode 21 and the distance between the electrodes, the overall trend of gastropod organisms can be predicted with high accuracy, and the occurrence of gastropod organisms can be detected with even higher accuracy and their future trends can be predicted.

[0148] Furthermore, taking into consideration the operating characteristics of gastropod organisms, it is also preferable that the distance between the opposing electrodes 2 is 1 m or more and a DC voltage of 20 to 50 V is applied between the opposing electrodes for 10 minutes or more.

[0149] The size of the pair of opposing electrodes 2 is not particularly limited, but it is more preferable that the higher side of the pair of opposing electrodes 2 has a smaller area than the lower side. For example, the lower electrode 21 can be a large plate, and the higher electrode 22 can be a rod. In this way, by making the area of ​​the higher side of the pair of opposing electrodes 2 smaller than that of the lower side, the lower side of the pair of opposing electrodes 2, where gastropod organisms tend to gather due to electrotaxis, is made larger in area, and then predicting and calculating the occurrence distribution over time, it becomes easier to predict the overall trend of gastropod organisms on a macro level, and the occurrence of gastropod organisms can be detected with even greater accuracy.

[0150] Based on this calculation, the prediction calculation unit 72 performs a calculation to predict the occurrence distribution of this gastropod organism per unit area throughout the entire paddy field. This prediction by the prediction calculation unit 72 is based on the inventor's research results that the distribution density per unit area of ​​the number of gastropod organisms attracted near the lower electrode 21 represents the distribution density throughout the entire paddy field with extremely high accuracy in terms of a sample survey.

[0151] Although the above is based on a collection device collected according to the third embodiment, this is only an example, and the above may be based on a collection device collected according to other embodiments.

[0152] (Other embodiments) In other embodiments, the target period can be scaled up even further, and in each of the above embodiments, as shown in Figure 13(a), the calculation means 7 can be configured to predict the occurrence C of gastropod organisms in the following year based on the correlation between the occurrence distribution A per unit area calculated by the calculation means 7 and the winter climatic conditions B of the current year, based on the number of individuals in the current year collected by the collection means 6.

[0153] The winter season is not particularly limited, but may be, for example, November to March. The winter climate condition B may be, for example, at least one of the average temperature, the minimum temperature, the maximum temperature, and the average humidity for each month in the winter season.

[0154] In this way, the calculation means 7 predicts the occurrence of gastropod organisms for the following year based on the correlation between the occurrence distribution per unit area calculated by the calculation means 7 and the climatic conditions of the winter of the current year, based on the number of individuals collected by the collection means 6 for the current year.Therefore, based on the number of individuals collected from spring to autumn of the current year and the climatic conditions of the winter when gastropod organisms hibernate, the occurrence status of gastropod organisms for the current year and the living conditions of gastropod organisms that overwinter and grow can be determined in a comprehensive manner, making it possible to predict the occurrence of gastropod organisms for the following year, and the occurrence status of gastropod organisms for the following year can be predicted with even greater accuracy.

[0155] In addition, it is also possible to predict the occurrence of gastropods by taking into account each growth stage of the growing plant. For example, in each of the above embodiments, as shown in Figure 13(b), the collection means 6 can collect the number of gastropods at each growth stage of the growing plant, the calculation means 7 can calculate the occurrence distribution per unit area for each growth stage, and the field management for the next growth stage E can be performed based on the calculated occurrence distribution data for the previous growth stage D.

[0156] Although not particularly limited, examples of such growing plants include rice and vegetables that are damaged by gastropod organisms. In the case of the giant pond snail, which damages rice, as an example of a gastropod organism, as shown in Figure 13(c), the growth stages of rice begin around late April, depending on the season, and include the sowing stage, seedling stage, puddling stage, transplanting stage, tillering stage, panicle formation stage, booting stage, heading stage, ripening stage, and harvest stage. For example, it is possible to perform field management for the next growth stage E, the puddling stage, based on data from the seedling stage as the previous growth stage D.

[0157] In this way, the collection means 6 collects the number of gastropod organisms at each growth stage of the growing plants, the calculation means 7 calculates the occurrence distribution per unit area for each growth stage, and field management for the next growth stage is performed based on this calculated data on the occurrence distribution for the previous growth stage.Therefore, it is possible to accurately predict how to proceed with field management for the next growth stage from the data on the occurrence distribution per unit area calculated from the number of gastropod organisms collected at each growth stage of the growing plants, and field management for the next growth stage can be supported accurately and easily without relying on experience or intuition.

[0158] This field management is not particularly limited, but examples include shallow water management and / or pesticide management. For example, in the case of the giant pond snail, which is an example of a gastropod organism that damages rice, as mentioned above, shallow water management can adjust the amount of water required for the next growth stage E, the rice planting stage, based on data from the puddling stage, which is the previous growth stage D of the rice. For example, if an increase in giant pond snails is predicted, the amount of water required for the rice planting stage can be reduced to minimize the growth of giant pond snails. Furthermore, if a decrease in giant pond snails is predicted, the amount of water required for the rice planting stage can be increased to minimize the growth of giant pond snails, and it becomes possible to promote the growth of rice with an abundant amount of water without worrying about giant pond snails.

[0159] Further, this pesticide management includes, for example, adjusting the amount of pesticide to be sprayed. For example, in the case of the giant pond snail, which is an example of a gastropod organism and which feeds on rice, the amount of pesticide to be sprayed in the next growth stage E, the tillering stage, can be adjusted based on data from the puddling stage, which is the previous growth stage D of the rice. For example, if an increase in giant pond snails is predicted, the amount of pesticide required in the rice planting period can be increased to minimize the growth of giant pond snails. Furthermore, if a decrease in giant pond snails is predicted, the amount of pesticide required in the rice planting period can be reduced to minimize the growth of giant pond snails, while also reducing pesticide costs and enabling reduced pesticide cultivation.

[0160] In this way, since this field management is shallow water management and / or pesticide management, it is possible to accurately predict the optimal shallow water management and / or pesticide management procedure for the next growth stage, which varies from year to year, based on data on the occurrence distribution of the previous growth stage, and it is possible to support the accurate and easy optimal shallow water management and / or pesticide management for the next growth stage without relying on experience or intuition.

[0161] In this way, by using the gastropod occurrence detection device according to each embodiment, it is possible to issue an alert including a prediction of the occurrence of feeding damage by gastropods. Furthermore, by instructing thorough shallow water management, proposing appropriate amounts of pesticides to spray, and estimating the density of shellfish before hibernation, it is possible to realize an excellent technology for estimating and predicting the density of gastropods, which can also predict the occurrence of overwintering shellfish in the following season.

[0162] In addition, the gastropod organism occurrence detection device according to each of the above embodiments can also be provided with a display means for displaying the calculation results by this calculation means 7 in a message app on an external terminal equipped with a message app.

[0163] Examples of external devices equipped with a messaging app include smartphones, tablets, and laptop computers. For example, the occurrence status of gastropod organisms detected by the gastropod organism occurrence detection device according to each of the above embodiments can be checked on the screen of a smartphone app regardless of time or location. The calculation by the calculation means 7 can also be performed on a network such as a cloud server, or on a smartphone app. The calculation by the calculation means 7 can also be performed multiple times (on multiple devices), thereby improving the prediction accuracy of gastropod organism occurrence detection based on multiple calculation results.

[0164] Other Embodiments In other embodiments, by using the collection device according to each of the above embodiments, it is possible to configure an extermination device for gastropods that can further exterminate gastropods.

[0165] For example, as shown in FIG. 14( a), the gastropod extermination device according to this embodiment can be configured with an ultrasonic generator 8 that generates ultrasonic vibrations and is disposed near the bottom surface of the distal end 11b of the guide piece 11. The ultrasonic generator 8 is not particularly limited as long as it can generate ultrasonic vibrations. For example, piezoelectric ceramics can be used to generate vibrations at frequencies of 20 kHz or higher. Furthermore, a thin ultrasonic generator 8 is preferred for ease of installation and maintenance. The power source for the ultrasonic generator 8 is not particularly limited, but it can be a battery alone or a battery in combination with a small solar panel. The ultrasonic output is not particularly limited, but it can be configured using one or more transducers. For example, a 100 W transducer can be used alone, or transducers of 50 W or less can be arranged in an array.

[0166] More preferably, the ultrasonic transducer 8 includes a vibration reflecting section 81 that is flat or curved, disposed on the upper surface of the capturing section, and reflects the ultrasonic vibrations generated by the ultrasonic generator 8 .

[0167] The vibration reflecting portion 81 can be made of any material that reflects ultrasonic vibrations, such as stainless steel. The curved structure provides a larger area for reflecting ultrasonic vibrations, further increasing the amount of reflected ultrasonic vibrations. As a result, as shown in FIG. 14( b), the ultrasonic vibrations α generated by the ultrasonic generator 8 are reflected by the vibration reflecting portion 81 toward the interior of the storage portion 5 without escaping upward, thereby ensuring reliable and efficient extermination of the gastropods 100 collected in the net 51.

[0168] Furthermore, although the storage unit 5 is not particularly limited, it is more preferable that the inside of the storage unit 5 be constructed from a parabolic mirror, as shown in Figure 14(c). A parabolic mirror is a type of focusing mirror, and has a reflecting mirror in the shape of a paraboloid of revolution centered on a central axis extending vertically from the end portion 11b of the guide piece 11. This causes the ultrasonic vibrations α generated and reflected inside the storage unit 5 to be focused at a specific focal point F, significantly amplifying and densifying the ultrasonic vibrations α, thereby further improving the extermination ability of gastropod organisms 100. That is, as shown in Figure 14(b) above, gastropod organisms 100 gathered at the position of the focal point F of the net 51 can be reliably and efficiently exterminated.

[0169] Furthermore, the configuration of the induction piece 11 is not particularly limited, but it is more preferable that the induction piece 11 be configured to be inclined at an angle θ with respect to the vertical plane, as shown in Fig. 15(a). This angle θ is not particularly limited, but can be, for example, 0°<θ<90°, more preferably 0°<θ<60°, and even more preferably 0°<θ<45°.

[0170] As described above, this guide piece 11 has a fragmentary shape and can be made of, for example, resin. With this inclined guide piece 11, as shown in Figure 15 (b), the ultrasonic vibration α that is reflected below the bottom surface of the end portion 11b of the guide piece 11 and travels upward is reflected downward again when it collides with the guide piece 11, so that the ultrasonic vibration α is irradiated more intensively onto the gastropod organisms 100 gathered below, making it possible to more reliably exterminate the gastropod organisms 100.

[0171] In addition to the above, as shown in FIG. 16( a), the vibration reflector 81 can be configured as a flat or curved plate, disposed on the upper surface of the capture unit, and configured to propagate ultrasonic vibrations generated by the ultrasonic generator 8. This allows the extermination device to have a flat, planar configuration, allowing for easy installation by simply placing it anywhere. With this configuration, as shown in FIG. 16( b), ultrasonic vibrations α are concentrated upward from directly below gastropod organisms 100 that have gathered around the end 11b of the guide piece 11, ensuring reliable extermination of the gastropod organisms 100. Even if the gastropod organisms 100 survive the ultrasonic vibrations α, they have the tendency to move outward using their own feet, making it easy to exterminate weakened gastropod organisms 100 outside the extermination device. In addition, as shown in Fig. 16(c), even in the configuration of the semicircular trapping part 1 and the plate-like lower electrode 21 shown in Fig. 7(d) as in the third embodiment described above, the ultrasonic wave generating part 8 can be attached near the distal end 11b of the guide piece 11. With this configuration, as shown in Fig. 16(d), the ultrasonic vibrations α, including the upper surface reflection by the vibration reflecting part 81, are irradiated in a concentrated horizontal direction onto the gastropod organisms 100 that have gathered at the distal end 11b of the guide piece 11, thereby ensuring the extermination of the gastropod organisms 100.

[0172] The gastropod extermination device described above may also be configured, as in the third embodiment, with a pair of opposing electrodes 2, in which the lower electrode 21 of the opposing electrodes 2 is disposed near the distal end 11b of the induction piece 11 of the trapping unit 1, and a DC power supply 3 that outputs a DC voltage between the opposing electrodes 2. The DC power supply 3 may be configured, as in the third embodiment, with an intermittent application of a voltage of 40 V, for example, by repeating an on-for-1-second / off-for-3-second cycle. This causes gastropod organisms 100 to be attracted to the lower electrode with a lower potential due to the phenomenon of congregating at a certain electrode (electrotaxis), and to move en masse toward the distal end 11b of the induction piece 11 of the trapping unit 1. This allows the attracted gastropod organisms 100 to be exterminated in a concentrated manner by ultrasonic vibrations.

[0173] Furthermore, the gastropod extermination device described above may also include, but is not limited to, a material supply unit 4 that supplies a material 41 composed of organic matter and / or ferric phosphate, as in the fourth embodiment. For example, the active ingredient can be concentrated by tableting or encapsulating the material 41, for example, by forming a layered capsule formulation in which a highly concentrated liquid attractant containing the material 41 is enclosed in an outer shell. It is also possible to diffuse the active ingredient by ultrasonic vibration.

[0174] The following examples are provided to illustrate the features of the present invention more specifically, but the present invention is not limited to these examples.

[0175] Example 1: A collection device (trap) according to the first embodiment was manufactured using a 3D printer (Raise3D Pro2 Plus, manufactured by RAISE3D). Using this trap, an electrical attraction test was conducted on a type of gastropod organism, the giant apple snail (Pomacea canaliculata), in an experimental system consisting of a 3 m x 5 m aquarium shown in Figure 17(a) under the following conditions. The trap was placed in the center of the aquarium, as shown in Figure 17(a), with 15 adult snails arranged on the right side and 15 juvenile snails arranged on the left side. Two plate-shaped high-side electrodes (four in total) were placed on each of the right and left walls.

[0176] <Experimental conditions> Electric attraction time: 60 minutes (voltage 0V after 60 minutes) Dissipation observation time: 120 minutes Number of specimens: 30 (2 specimens / m 2 ) (15 adult shellfish (25mm-40mm), 15 juvenile shellfish (<10mm)) Number of repetitions: 5 times Evaluation: Compare the number of shellfish attracted to the trap with the number of shellfish remaining there after 2 hours

[0177] The results obtained are shown in Figure 17(b), which shows the state of the traps one and two hours after electrical attraction. The black circles in Figure 17(b) are the attracted giant snails. Figure 17(c) shows the number of adult and juvenile giant snails in the traps.

[0178] The results showed that the number of giant snails (adult shells) remained the same two hours after electro-attraction, confirming that they had a strong tendency to remain without dispersing. The increase in the number of giant snails (juvenile shells) two hours after electro-attraction may have been difficult to see in the traps, which may have resulted in errors, so it is thought that the number remained roughly the same.

[0179] In other words, it was confirmed that the giant snails captured in this trap, even when they had extended their abdominal legs and were able to move, could remain in the trap for two hours without scattering, due to the trap's shape, which allows the snails to easily settle.

[0180] (Example 2) An electrical attraction test was conducted on giant apple snails (Pomacea canaliculata), a type of gastropod organism, in an experimental system of a rice paddy shown in Figures 18(a) and (b) using the collection device (trap) of the first embodiment described above under the following conditions.

[0181] In the following, the electrode configuration of the trap is not particularly limited, but the installation of a rod-shaped low-potential electrode (negative electrode) and two rod-shaped high-potential electrodes (positive electrodes) will be referred to as a "rod-rod-rod" combination, and the installation of two plate-shaped high-potential electrodes (positive electrodes) will be referred to as a "rod-plate-plate" combination. Alternatively, it is possible to install a plate-shaped low-potential electrode (negative electrode). <Experimental conditions> Objective: Electric attraction test in rice paddies (Sasebo City) Method: A rod-shaped low-potential electrode (negative electrode) was installed in the trap, and the number of animals attracted by different shapes of high-potential electrodes (positive electrodes) (rod, plate) was measured Experimental time: 2 hours Evaluation: Number of animals captured in the trap

[0182] In the experimental system of a rice paddy shown in Figure 18, two high-potential electrodes (positive electrodes) were placed along the same wall surface with a distance of 1 m between them, and the distance between the wall surface and the low-potential electrode (negative electrode) was 0.5 m.

[0183] In the experimental system of a rice paddy shown in Figure 18(a), a current of 0.08 A was applied continuously at a voltage of 50 V. In the experimental system of a rice paddy shown in Figure 18(b), a current of 0.25 A was applied continuously at a voltage of 50 V.

[0184] The results are shown in the table below. These results confirmed that even in paddy fields, the insects tended to be attracted to the area around the low-potential electrode (negative electrode) installed in the trap. Furthermore, in the case of the "rod-plate" combination, the large-area plate-shaped electrode allowed a large current to flow, resulting in stable attraction behavior.

[0185]

[0186] (Example 3) An electric attraction test was conducted on giant apple snails (Pomacea canaliculata), a type of gastropod organism, in the same tank as in Example 1 above, using a material consisting of ferric phosphate (product name: Scumin Bait 3 (registered trademark)) in combination with electric attraction. The observation period was set at 2 hours, and the number of individuals attracted was evaluated.

[0187] The results for the case of using only the material (ferric phosphate) and the case of using the material (ferric phosphate) in combination with electric attraction are shown in Figure 19. The results show that when only ferric phosphate was used, the giant snails were initially attracted by the effect of the ferric phosphate, but they dispersed over time. When ferric phosphate and electric attraction were used in combination, a large number of giant snails were killed, confirming that electric attraction can enhance the attractant effect of ferric phosphate.

[0188] Example 4: The attraction effect of a combination of electrical attraction and a material (ferric phosphate) on giant apple snails, a type of gastropod organism, including the effect of time, was confirmed in an experimental system using an aquarium as shown in Figure 20(a) under the following conditions: As shown in Figure 20(a), the giant apple snails were aligned in the center of the aquarium, and the lower electrode and material (ferric phosphate) were placed on the right wall, and the lower electrode was placed on the left wall.

[0189] <Experimental conditions> Voltage: 25V (voltage + 10g of ferric phosphate), 0V (ferric phosphate only) Time: 1 hour, 2 hours, 5 hours Shellfish condition: fasting (1 hour only) Ferric phosphate: 10g Repetitions: 3 Number of individuals: 20 per case Determination of survival: 7 days later Aquarium: 170 x 110 cm x 8 cm depth

[0190] The situation after 10 minutes and 30 minutes is shown in Figures 20(b) and 20(c). From these results, it was confirmed that the giant snails were attracted to the right wall where the lower electrode was located as time passed.

[0191] (Example 5) An electric attraction test was conducted on giant apple snails (Pomacea canaliculata), a type of gastropod organism, using a combination of electric attraction and ferric phosphate under the following conditions in an experimental system in a rice paddy (Sasebo City) shown in Figure 21. The promoting effect of using ferric phosphate and electricity in combination was confirmed. Counter electrodes were installed at three locations: installation location A, installation location B, and installation location C, near the banks of the rice paddy shown in Figure 21.

[0192] <Experimental conditions> Method: The number of oysters attracted after 2 hours was compared between when ferric phosphate was sprayed around the negative electrode and when only the iron was sprayed, and the number of oysters killed after 7 days was compared. Voltage: 50V Current: 0.5-0.8A Application method: 1 second on / 1 second off Experimental time: 2 hours Ferric phosphate: 10g, sprayed within 20-30cm from the electrode Evaluation: Number of oysters attracted (30cm on both sides of the electrode; adult oysters (≧25mm), juvenile oysters (11-25mm) *excluding oysters under 10mm), number of oysters killed after 7 days

[0193] The results obtained for the three installation locations are shown in Figures 22(a) to (c). The results showed that when ferric phosphate was used in combination with electricity, the number of giant snails attracted and killed increased. After electrical attraction, the giant snails tended to remain enclosed in their shells. This suggests that many individuals were attracted to the material (ferric phosphate) by electrical attraction.

[0194] Example 6 The experiment of Example 5 was carried out under the following conditions, except that the material (ferric phosphate) was omitted, and an electric attraction test for giant pond snails was carried out.

[0195] <Experimental conditions> Voltage: 50V Current: 0.5-0.8A Application method: 1 second ON / 1 second OFF Experimental time: 24 hours, 48 ​​hours Evaluation: Number of attracted heads (30cm on both sides of the electrode; adult oysters (≧25mm), juvenile oysters (11-25mm) *excluding those under 10mm)

[0196] Figure 23(a) shows the results for the three installation locations A, B, and C, 24 hours after voltage application. Figure 23(b) shows the results for 48 hours after voltage application. The results confirmed that the giant snails moved from the positive electrode to the negative electrode, from higher to lower potential, at all three installation locations, while the electrical attraction effect continued over time. It was also confirmed that the number of individuals attracted tended to increase as the attraction time increased. In particular, approximately two to three times as many individuals were attracted 48 hours after voltage application compared to 24 hours after voltage application.

[0197] Example 7 Using the above-described collection device, a type of gastropod organism, the density of giant apple snails was estimated, occurrence forecasts were made, and an electric attraction test for shellfish density was carried out under the following conditions.

[0198] (Condition 1) Shellfish density: 2 heads / m 2 , 4 head / m 2 , 10 head / m 2 Applied voltage: 40 V Negative electrode shape: rod (φ1 cm, 30 cm), plate (20 × 20 cm × thickness 5 mm) Experimental rice field: 2.5 m × 5 m (within the Sasebo National College of Technology site) Observation time: 3 hours (Condition 2) Shellfish density: 4 individuals / m 2 Applied voltage: 20V, 40V, 60V Negative electrode shape: rod (φ1cm, 30cm) Experimental rice field: 2.5m x 5m (within the Sasebo National College of Technology site) Observation time: 3 hours

[0199] The results are shown in Figure 24. The results show that the giant snails move from the direction of higher potential to the direction of lower potential, and whether the negative electrode is rod-shaped or plate-shaped, the number of giant snails attracted to the area around the electrode can be used to determine the snail density (heads / m 2 It was confirmed that it is possible to estimate (predict) the above with high sensitivity.

[0200] (Example 8) For giant apple snails (Pomacea canaliculata), a type of gastropod organism, an occurrence detection device was used to estimate the density of giant apple snails, predict their occurrence, and conduct an electrical attraction test for shellfish density under the following conditions. The device is composed of a bucket-shaped storage tank that can store water inside to accommodate giant apple snails, and is equipped with a lower electrode 21 in the center, the trap (collection means 6) arranged around this lower electrode 21, and four higher electrodes 22 near the inner surface.

[0201] (Conditions) Electrodes: 4 positive electrodes (plates), 1 negative electrode (rod) Voltage: 20V Shell density: 10, 20, 50, 100 shells / m 2 Observation time: 3 hours (3 repetitions)

[0202] The results obtained for voltages of 0 V and 20 V are shown in Figure 25. No giant snails escaped from the traps, confirming that the number of snails captured in the traps tends to depend on the snail density. It was confirmed that the snail density can be predicted from the number of giant snails captured in the traps.

[0203] (Example 9) The relationship between the size of the giant apple snail shells and the attraction results was investigated under the following conditions using an occurrence detection device consisting of an aquarium containing giant apple snails, a type of gastropod organism.

[0204] (Conditions) Shell height 8-13mm (juvenile shellfish) 30-35mm (adult shellfish) Voltage V (electric field V / m) 0V (0V / m), 2V (2.7V / m), 5V (6.7V / m), 10V (13.3V / m), 20V (26.7V / m) Number of specimens 10 Experimental time 30 minutes

[0205] Figure 26 shows the results of counting the number of individuals that entered within 3 cm of the electrode. The results confirmed that adult oysters are more easily attracted to low voltages than juvenile oysters and react faster than juvenile oysters. Furthermore, while juvenile oysters are less attracted to low voltages than adult oysters, they are able to move even under high voltages that would electrocute adult oysters and prevent them from moving. Therefore, it was confirmed that they are attracted close to the electrode under an uneven electric field. It was confirmed that the densities of adult and juvenile oysters can be measured separately.

[0206] DESCRIPTION OF SYMBOLS 1 Capture section 1a Opening 1b End surface 11 Inductor 11a Tip section 11b End section 11c Folded section 11d Protruding return section 11e Concave and convex section 11f Upper both end fixing section 12 Support section 12a Support rod 13 Inductor support section 13a Inductor tip support section 13b Inductor end support section 13c Inductor middle support section 2 Counter electrode 21 Lower side electrode 21a Lower side insulating plate 22 High side electrode 22a High side insulating plate 22b Holder 3 DC power supply 31 Polarity switching control section 4 Material supply section 41 Material 5 Storage section 51 Net 52 Lid 52a Notched flat plate 53 Motor 53a Motor control section 6 Collection means 7 Calculation means 71 Distribution calculation section 72 Prediction calculation unit 8 Ultrasonic wave generation unit 81 Vibration reflection unit 100 Gastropod organism 200 Paddy field 201 Ridge

Claims

1. A gastropod organism collection device for collecting gastropod organisms, comprising: a plurality of guide pieces arranged radially, the ends of which are fixed to one another; and a capture section having an opening between the tips of the guide pieces, wherein the opening of the capture section is formed larger than the maximum outer diameter of the target type of gastropod organism.

2. A gastropod organism capturing device according to claim 1, characterized in that the guide piece is formed in a rod or plate shape.

3. A gastropod organism capturing device according to claim 1, characterized in that the guide piece has a barbed structure.

4. A gastropod organism capturing device according to claim 1, characterized in that the guide piece has an uneven surface.

5. A gastropod organism collection device according to claim 1, characterized in that the inductive piece is made of a material selected from the group consisting of ceramic, plastic, rubber, cellulose, and resin, or a material selected from the group consisting of silicon, fluororesin, ultra-high molecular weight polyethylene, monomer cast nylon, and polyacetal, to which a conductive material has been applied or mixed.

6. A gastropod organism trapping device according to claim 5, characterized in that the conductive material is made of a carbon material.

7. A gastropod organism trapping device according to claim 5, characterized in that the substrate is biodegradable.

8. A gastropod organism collection device as described in claim 1, characterized in that it comprises: a pair of opposing electrodes arranged via a medium material made of a dielectric or conductive material, the lower electrode of which is arranged near the end of the inductor piece of the capture section; and a DC power source that outputs a DC voltage between the opposing electrodes.

9. A gastropod organism collection device as described in claim 8, characterized in that the lower electrode of the opposing electrodes is formed in a rod or plate shape, and the higher electrode of the opposing electrodes is formed in one or more rod or plate shapes.

10. The gastropod organism collection device according to claim 8, further comprising a material supply section for supplying a material comprising organic matter and / or ferric phosphate.

11. A gastropod organism capturing device according to claim 10, characterized in that the material supply section supplies the material in a concentration that increases toward the end of the guide piece of the capture section.

12. A gastropod organism capturing device according to any one of claims 1 to 5, characterized in that the capturing part has a storage section for storing gastropod organisms in a lower area of ​​the bottom surface near the end of the guide piece.

13. A gastropod organism collection device as described in claim 12, characterized in that it is provided with upper end fixing parts that support both upper ends of the guide piece so that the lower part of the guide piece can swing freely.

14. A gastropod organism collecting device as set forth in claim 12, characterized in that it comprises vibration means for intermittently vibrating the guide piece.

15. A gastropod organism occurrence detection device comprising: a collection means for collecting the number of gastropod organisms captured by the gastropod organism capture device described in claim 8; and a calculation means for calculating the occurrence distribution of the gastropod organisms per unit area based on the number of individuals collected by the collection means.

16. A gastropod organism occurrence detection device as set forth in claim 15, characterized in that the calculation means predicts the occurrence of gastropod organisms in the following year from the correlation between the occurrence distribution per unit area calculated by the calculation means and the winter climatic conditions of the current year, based on the number of individuals collected by the collection means for the current year.

17. A gastropod organism occurrence detection device as described in claim 15, characterized in that the collection means collects the number of gastropod organisms at each growth stage of the growing plant, the calculation means calculates the occurrence distribution per unit area for each growth stage, and performs field management for the next growth stage based on the calculated occurrence distribution data for the previous growth stage.

18. The gastropod organism occurrence detection device according to claim 17, characterized in that the farmland management is shallow water management and / or pesticide management.

19. The gastropod organism occurrence detection device according to claim 15, further comprising a display means for displaying the calculation results by the calculation means on an external terminal equipped with a message application.

20. A gastropod extermination device using the gastropod collection device described in claim 1, characterized in that it comprises an ultrasonic generator disposed near the bottom surface of the distal end of the guide piece and which generates ultrasonic vibrations.

21. A gastropod extermination device as set forth in claim 20, characterized in that it comprises a vibration reflecting section that is flat or curved, is disposed on the upper surface of the capturing section, and reflects or propagates the ultrasonic vibrations generated by the ultrasonic generating section.

22. A gastropod extermination device according to claim 20, characterized in that the guide piece is configured to be inclined relative to a vertical plane.

23. The gastropod extermination device according to claim 20, wherein the inside of the storage section is made up of a parabolic mirror.

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