Facility breeding device for ovogenesis freshwater snail fries and use method of facility breeding device for ovogenesis freshwater snail fries

Abstract

The invention discloses a facility breeding device for ovolive freshwater snail fries and a use method, and belongs to the field of freshwater snail culture facilities in aquaculture. The facility breeding device comprises a snail seed placing basket, a tail water collecting barrel, a snail seedling collecting bag and an algae culture barrel, and the snail seed placing basket is flatly laid on an aquarium; the lower part downwards sprays to the snail seed placing frame through a water suction pump, a vertical water pipe, a horizontal water inlet pipe and water inlet holes which are formed at equal intervals; a water quality monitor is additionally arranged below the right side in the aquarium, and the water quality index of the water body in the aquarium is maintained within a set range through a control panel and manual intervention measures; a snail seedling outlet and a filter screen are arranged below the left front side of the aquarium, snail seedlings are discharged into a snail seedling collecting pipe in a flushing water mode and enter a tail water collecting barrel, and a snail seedling collecting bag is arranged in the snail seedling collecting barrel; the tail water enters the water purifier from a water outlet in the lower side of the tail water collecting barrel, and is supplied to the algae culture barrel after being purified; and a timer and a water flow control valve are additionally arranged in the middle of the algae culture barrel.

Description

Technical Field

[0001] The present invention provides an artificial breeding device and method for viviparous freshwater snail fry, which relates to the field of freshwater snail breeding facilities in aquaculture and can be used for breeding all species of Bellamya quadrata and Cipangopaludina chinensis in ponds, reservoirs, water channels or rice field ditches. Background Art

[0002] In recent years, the Liuzhou River Snail Rice Noodles in Guangxi Zhuang Autonomous Region have rapidly developed into a new industrial chain with an output value exceeding 10 billion yuan, and its products are sold to more than 20 countries and regions. As the core raw material of this industry and the soul of the high soup, river snails are also a popular food in night snack stalls and physical stores, with an annual consumption of more than 1.5 million tons. However, the current national output of river snail farming is only more than 90,000 tons, far from meeting the market demand. Therefore, it will be an inevitable trend to strengthen the artificial breeding of river snails in the future.

[0003] Currently, the main viviparous freshwater economic snails in the market are Bellamya quadrata and Cipangopaludina chinensis, but there are no related artificial breeding facilities and methods for their fry. At present, the "integration of breeding and cultivation" mode commonly adopted by farmers, that is, directly putting snail seeds during the breeding process without separately collecting snail fry, and the seeds and fry grow together in the same pond. The following problems will occur during the breeding process: First, inbreeding occurs frequently, leading to germplasm degradation; second, the specifications of commercial snails are uneven, the growth is asynchronous, and the cost of manually picking snails is high; third, the mortality rate is high and the yield is low at the fry stage; fourth, the production and supply of fry in the market are still blank.

[0004] Therefore, how to design an artificial breeding device and method for viviparous freshwater snail fry has become a technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] Aiming at the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: to provide an artificial breeding device and method for viviparous freshwater snail fry, so as to solve the problems of germplasm degradation caused by inbreeding, uneven specifications and asynchronous growth of commercial snails, high mortality rate and low yield at the fry stage, etc.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An apparatus and method for the industrialized breeding of ovoviviparous freshwater snail fry, including a water quality monitor, a snail species placement basket, a control panel, a snail fry collection pipe, a tail water collection bucket, a snail fry collection bag, a water purifier, an algae culture bucket, a water pump, and a timer. The snail species placement basket is placed flat on the aquarium, and water is sprayed downward into the snail species placement basket through a water pump, a vertical water pipe, a horizontal water inlet pipe, and equally spaced water inlet holes below; a water quality monitor is installed at the lower right side inside the aquarium, and through the control panel and manual intervention measures, the water quality indicators in the tank are maintained within the set range; a snail fry discharge port is provided at the lower left front side of the aquarium and is equipped with a filter screen. The snail fry is discharged into the snail fry collection pipe by flushing with water and enters the tail water collection bucket, which is provided with a snail fry collection bag inside; the tail water enters the water purifier from the drainage port on the lower side of the tail water collection bucket, and after water quality purification, it supplies water to the algae culture bucket; the other end of the algae culture bucket is connected to the water pump, and a timer and a water flow control valve are installed in the middle.

[0008] Preferably, the snail fry collection pipe is parallel to the bottom of the aquarium, and the bottom of the aquarium slopes downward at an angle of 5 degrees to facilitate the discharge of snail fry.

[0009] Preferably, the mesh diameter of the snail species placement basket is 1 - 2 cm, the mesh diameter of the filter screen at the snail fry discharge port is 1 - 2 cm, and the mesh of the snail fry collection bag is 20 mesh.

[0010] Preferably, the water quality monitor, the control panel, the water purifier, and the timer are all purchased as commercially available aquarium products.

[0011] Usage method: Before using the equipment, first cultivate algae such as diatoms or green algae that snails like to eat in the algae culture box 7 days in advance; then close the switch of the snail fry discharge port, and open the water inlet pipe, the water flow control valve, and the water pump; then gently place the snail species with regular specifications, no damage, and vitality into the snail species placement basket. Among them, the snail species of Cipangopaludina chinensis ≥ 3 g, the stocking density is 100 individuals / ㎡, and the male-female ratio is 4:1; the snail species of Cipangopaludina cathayensis ≥ 20 g, the stocking density is 20 individuals / ㎡, and the male-female ratio is 1.5:1. At the same time, turn on the water quality monitor and the control panel, detect the water body in real time, and through manual intervention measures, maintain the temperature within the range of 25 - 28 °C, the dissolved oxygen within the range of 5.0 - 5.5 mg / l, and the algae abundance within the range of 30,000 to 50,000 cells / ml. During the breeding period, by setting the timer, timed and quantitative feeding of algae is achieved, and the specific requirements are 5 times / day and 2 hours / time. After breeding for 7 days, spot-check the number of fry. When the snail fry reaches more than 30 individuals / ㎡, the switch of the snail fry discharge port can be opened, and the snail fry is washed with water to make it enter the snail fry collection pipe, flow through the water to the snail fry collection bag, and the collected snail fry is transferred to the medium culture area for continued cultivation.

[0012] Beneficial effects

[0013] The present invention has the following advantages:

[0014] 1. Environmental control: The facility-based breeding device can provide stable water temperature, dissolved oxygen, algal abundance and other conditions, creating an optimal environment suitable for the growth of snails, thereby increasing the survival rate of fry by more than 90% and the growth rate by more than 20%;

[0015] 2. Yield improvement: Through large-scale and systematic management, the production scale and efficiency of snail fry can be significantly improved. 3-6 batches of snail fry can be produced annually to meet market demand and fill the gap in the snail fry supply market;

[0016] 3. Disease management: Facility-based breeding can effectively reduce the impact of external environmental factors such as water temperature, dissolved oxygen, and bait, enabling the aquaculture environment to be controllable and adjustable, reducing the spread and occurrence of diseases, thereby increasing the survival rate of commercial snails and enhancing aquaculture benefits;

[0017] 4. Resource conservation: Facility-based aquaculture can achieve the recycling of water resources and bait, reducing aquaculture production costs and increasing economic benefits;

[0018] 5. Diversified aquaculture: The facility can support the simultaneous reproduction and aquaculture of various ovoviviparous freshwater economic snails such as Bellamya purificata, Cipangopaludina cathayensis, and Cipangopaludina chinensis, enhancing the flexibility and adaptability of aquaculture;

[0019] 6. Technology integration: Modern facilities are usually equipped with advanced monitoring equipment and automated systems, which help to monitor and manage key parameters such as water quality and temperature in real time, improving management efficiency and reducing the labor cost of fry collection by more than 50%;

[0020] 7. Market competitiveness: The fry produced by facility-based breeding are of higher quality and more uniform (the controllable specification is about 1 g), which can improve market competitiveness and meet the high-standard market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : The facility-based fry breeding device involved in the present invention;

[0022] Figure 2 : The flowchart of the fry breeding workshop involved in the present invention.

[0023] Among them, 1, water inlet pipe; 2, water inlet hole; 3, water level control hole; 4, water quality monitor; 5, snail species placement basket; 6, control panel; 7, fry discharge port; 8, fry collection pipe; 9, tail water collection bucket; 10, fry collection bag; 11, water purifier; 12, algae culture bucket; 13, water pump; 14, timer; 15, water flow control valve; 16, fry discharge port switch; 17, aquarium. DETAILED DESCRIPTION OF THE INVENTION

[0024] Examples are given below to specifically describe the present invention. The disclosed embodiments can be considered illustrative in all aspects and are not restrictive. The scope of the present invention is not limited by the description of the following embodiments, but is only indicated by the scope of the claims, and includes all modifications within the same meaning as the scope of the claims and within the scope of the claims.

[0025] Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.

[0026] An apparatus and method for the facility-based breeding of ovoviviparous freshwater snail fry, comprising a water quality monitor 4, a snail species placement basket 5, a control panel 6, a snail fry collection tube 8, a tail water collection bucket 9, a snail fry collection bag 10, a water purifier 11, an algae culture bucket 12, a water pump 13, and a timer 14. The snail species placement basket 5 is placed flat on the aquarium 17, and water is sprayed downward onto the snail species placement basket 5 through the water pump 13, a vertical water pipe, a horizontal water inlet pipe 1, and equally spaced water inlet holes 2; a water quality monitor 4 is installed below the right side of the aquarium, and the water quality indicators in the aquarium are maintained within the set range through the control panel 6 and manual intervention measures; a snail fry discharge port 7 is provided below the left front side of the aquarium and is equipped with a filter screen, and the snail fry is discharged into the snail fry collection tube 8 by flushing and draining water, and enters the tail water collection bucket 9, which is provided with a snail fry collection bag 10; the tail water enters the water purifier 11 from the drain port on the lower side of the tail water collection bucket 9, and after water purification, it supplies water to the algae culture bucket 12; the other end of the algae culture bucket 12 is connected to the water pump 13, and a timer 14 and a water flow control valve 15 are installed in the middle.

[0027] Preferably, the snail fry collection tube 8 is parallel to the bottom of the aquarium, and the bottom of the aquarium 17 is inclined downward by 5 degrees to facilitate the discharge of snail fry.

[0028] Preferably, the mesh diameter of the snail species placement basket 5 is 1 - 2 cm, the mesh diameter of the filter screen of the snail fry discharge port 7 is 1 - 2 cm, and the mesh of the snail fry collection bag 10 is 20 mesh.

[0029] Preferably, the water quality monitor 4, the control panel 6, the water purifier 11, and the timer 14 are all purchased as commercially available aquarium products.

[0030] Usage method: Before using the device, cultivate algae such as diatoms and green algae that snails like to eat in the algae incubator 12 7 days in advance; then close the switch 16 of the snail seedling discharge port, and open the water inlet pipe 1, the water flow control valve 15, and the water pump 13; then gently put the snail seeds with regular specifications, no damage, and vitality into the snail seed placement basket 5, where the ringed rice snail seeds are ≥3g, the stocking density is 100 snails / ㎡, and the male-female ratio is 4:1; the field snail seeds are ≥20g, the stocking density is 20 snails / ㎡, and the male-female ratio is 1.5:1. At the same time, turn on the water quality monitor 4 and the control panel 6 to detect the water body in real time, and through artificial intervention measures, maintain the temperature in the range of 25-28°C, the dissolved oxygen in the range of 5.0-5.5mg / l, and the algae abundance in the range of 30,000 to 50,000 cells / ml. During the breeding period, set the timer 14 to achieve regular and quantitative feeding of algae, and the specific requirements are 5 times a day and 2 hours each time. After 7 days of breeding, spot-check the number of seedlings. When the number of snail seedlings reaches more than 30 snails / ㎡, the switch 16 of the snail seedling discharge port can be opened, and the snail seedlings can be washed with water to enter the snail seedling collection pipe 8, and then flow through the water to the snail seedling collection bag 10, and the collected snail seedlings can be transferred to the medium-cultivation area for continued cultivation.

[0031] Example

[0032] 1. Facility-based breeding

[0033] Device setup: Use the facility-based breeding device for viviparous freshwater snail seedlings of the present invention to set up the facility-based breeding device to ensure the normal operation of the device.

[0034] Release of broodstock: Release the broodstock into the breeding box. The density of Bellamya purificata is 100 snails / ㎡, and the male-female ratio is 4:1. The density of Cipangopaludina cathayensis is 20 snails / ㎡, and the male-female ratio is 1.5:1. Each group has 3 replicates.

[0035] Daily management: Keep the water temperature at 25-28°C, replenish water regularly, and apply fertilizer paste once every 3 days at a dosage of 5g / ㎡ for cultivating algae (abundance 30,000-50,000 ind / m 3 ).

[0036] Collection of juvenile snails: Regularly collect and transfer to an independent breeding box every 7 days through the snail seedling collection bag, count the number of offspring, and then cultivate to 30 days old to count the growth and survival rate.

[0037] 2. Paddy field seedling breeding

[0038] Paddy field preparation: Set up fences in the paddy field, dig a "field-shaped" snail ditch with a width of 1m and a depth of 30cm, and kill enemy organisms such as wild fish and Pomacea canaliculata.

[0039] Release of broodstock: Evenly release the broodstock into the paddy field. The breeding density and male-female ratio are the same as those in the facility breeding device. Each group has 3 replicates.

[0040] Daily management: Keep the water depth of the paddy field at 10-15 cm, and add fertilizer paste every 3 days at a dosage of 5g / ㎡ to cultivate algae (abundance 30000-50000ind / m 3 ).

[0041] Collection of young snails: A bamboo strip collection device was set up in the rice field to collect young snails every 7 days.

[0042] 3. Data Collection

[0043] Litter size: Record the number of litters born by parent snails per square meter per week.

[0044] Survival rate: The survival rate of snails at 30 days of age was recorded.

[0045] Uniformity: The uniformity is expressed by calculating the coefficient of variation based on body weight and shell height. The closer the uniformity value is to 1, the smaller the dispersion of indicators such as size or weight of individuals in the sample, that is, the higher the uniformity.

[0046]

[0047] Catch rate: the ratio of the number of snails caught in one square meter to the total number of snails caught in the same period of time. Repeat 5 times for each group.

[0048] Snail catching efficiency: the time each person spends catching snails within one square meter, and each group repeats 5 times.

[0049] 4. Test results

[0050]

[0051] The number of litters, survival rate of snails, fishing efficiency, catch rate and uniformity of the facility breeding group were significantly higher than those of the rice field seedling breeding group. Through this experiment, it is expected to provide a scientific basis for the facility breeding and rice field seedling breeding of river snails, optimize the breeding technology, and promote the development of the river snail breeding industry.

Claims

1. A facility-based breeding device for ovoviviparous freshwater snail seedlings and a method for using the device, characterized in that: The invention comprises a water quality monitor (4), a snail seed placement basket (5), a control panel (6), a snail seed collection tube (8), a tail water collection bucket (9), a snail seed collection bag (10), a water purifier (11), an algae culture bucket (12), a water pump (13) and a timer (14); the snail seed placement frame (5) is laid flat on an aquarium (17); and the snail seed placement frame (5) is sprayed downwards through the water pump (13), a vertical water pipe and a horizontal water inlet pipe (1) and water inlet holes (2) arranged at equal intervals; a water quality monitor (4) is installed at the lower right side of the aquarium; and the control panel is used to control the water quality of the snail seed placement frame (5). (6) and artificial intervention measures are taken to maintain the water quality index of the water body in the aquarium within the set range; a snail seedling discharge outlet (7) is arranged at the lower left front side of the aquarium and a filter is added, and the snail seedlings are discharged into a snail seedling collection pipe (8) by flushing water, and enter a tail water collection bucket (9) in which a snail seedling collection bag (10) is arranged; the tail water enters a water purifier (11) from the lower side discharge outlet of the tail water collection bucket (9), and after the water quality is purified, water is supplied to an algae culture bucket (12); the other end of the algae culture bucket (12) is connected to a water pump (13), and a timer (14) and a water flow control valve (15) are installed in the middle.

2. The device for breeding ovoviviparous freshwater snail seedlings and the method for using the same according to claim 1, characterized in that: The snail seedling collection tube (8) is parallel to the bottom of the aquarium tank, and the bottom of the aquarium tank is tilted downward by 5 degrees to facilitate the discharge of the snail seedlings.

3. The device for breeding ovoviviparous freshwater snail seedlings and the method for using the same according to claim 1, characterized in that: The mesh diameter of the snail seed placement basket (5) is 1-2 cm, the mesh diameter of the snail seedling discharge outlet (7) is 1-2 cm, and the mesh diameter of the snail seedling collection bag (10) is 20 meshes.

4. The device for breeding ovoviviparous freshwater snail seedlings and the method for using the same according to claim 1, characterized in that: The method comprises the following steps: before using the device, 7 days in advance, culturing algae such as diatoms and green algae that are preferred by snails in an algae culture box (12); then closing the snail seed discharge outlet switch (16), opening the water inlet pipe (1), the water flow control valve (15), and the water pump (13); then gently placing snail seeds that are neatly sized, intact, and vigorous into a snail seed placement basket 5, wherein the ring-edge snail seeds are ≥3g, the density of placement is 100 per square meter, and the male-female ratio is 4:1; the round field snail seeds are ≥20g, the density of placement is 20 per square meter, and the male-female ratio is 1.5:1; at the same time, turning on the water quality monitor (4) and the control panel (6), and real-time detection of the water body is performed. Through artificial intervention measures, the temperature is maintained in the range of 25-28°C, the dissolved oxygen is maintained in the range of 5.0-5.5mg / l, and the algae abundance is maintained in the range of 30,000 to 50,000 cells / ml; during the culture period, a timer (14) is set to achieve regular and quantitative feeding of algae, with the specific requirement of 5 times / day, 2 hours / time; after 7 days of culture, the number of seedlings is randomly checked. When the number of snail seedlings reaches more than 30 / ㎡, the snail seedling discharge outlet switch (16) can be opened, and the snail seedlings can be flushed with water to enter the snail seedling collection tube 8, and then flow to the snail seedling collection bag (10), and the snail seedlings are collected and moved to the medium cultivation area for further cultivation.

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