75 results about "Predation" patented technology

The invention discloses a bird repelling method based on millimeter wave radar and predation action simulation, which comprises the following steps: sending millimeter waves into a detection area range, and receiving echo signals of the millimeter waves; whether birds exist in the detection area range or not is judged according to the echo signals, and if yes, behavior data and feature data of the birds are determined; a target position is determined based on the behavior data and the feature data, and a simulation bird is launched to the target position to execute a simulation predation expelling action or an interception expelling action; whether birds exist in the detection area or not is recognized through the echo signals of the millimeter waves, if the birds exist in the detection area, the simulated birds are emitted to execute the simulated predation repelling action, bird repelling is achieved, and the problems that the birds are high in adaptability and the bird repelling effect is worse and worse can be effectively solved.

The invention discloses a sepiella maindroni stepped wild domestication device which comprises a plurality of net cages arranged from inside to outside, each net cage is provided with a plurality of meshes, and the meshes in different net cages are gradually increased from inside to outside in a stepped manner; a plurality of suspension type fish reefs are arranged in the net cage, each suspension type fish reef comprises a plurality of single bodies horizontally installed on the floating rope, and each single body is a shell with a plurality of small holes formed in the shell wall. An area which is flat in terrain, relatively gentle in water flow, rich in plankton and about 10 m in water depth is selected near a sea area to be released as a domestication field, the device is put into the domestication field, and in-situ wild domestication is carried out on sepiella maindroni larvae; and the predation capability, the capability of avoiding enemies and the capability of coping with environmental stress after entering a natural sea area are improved, so that the enhancement and release effects are improved.

The utility model provides a rice and fish circulating feeding device with high protective property, which relates to the technical field of rice and fish feeding and comprises a feeding component, a circulating component is arranged on the side surface of the feeding component, a protective component is arranged at the top of the feeding component, the feeding component comprises a culture pond, and the protective component comprises a protective net. And one end of the protective net is connected with a winding roller, a rotating shaft penetrates through the interior of the winding roller, and a winding motor is installed at one end of the rotating shaft. The rotating shaft is electrically driven by the winding motor to rotate, so that the winding roller releases the protective net and pulls the protective net to cover the culture pond, effective protection is provided for fishes in the culture pond, predation of birds and the like is avoided, loss caused by predation of the fishes is reduced, and the service life of the culture pond is prolonged. The economic loss of farmers is reduced, the income of the farmers is further increased, meanwhile, stable growth and development of the fishes in the culture pond are guaranteed, and the culture yield and quality are improved.

The invention belongs to the technical field of environmental engineering, and discloses a predation-enhanced cascade fixed biological membrane sewage treatment process dual-environment-three-component coupling model. Metabolism of autotrophic microorganisms and heterotrophic microorganisms in activated sludge and a biological membrane and predation effects of protozoan and metazoan are comprehensively considered, on the basis of a mass balance principle, a substance conversion way in a biological predation enhanced sewage treatment reactor is analyzed, and dynamic changes of bacteria and pollutants are disassembled into diffusion, metabolism and predation processes; a material flow model framework is established, on the basis of an ASM1 activated sludge model and a biological membrane model, a primary animal predation model and a metazoan predation model are coupled, and a dual-environment-three-component coupling model is recreated. According to the method, the pollutant removal process and the dynamic change of the microbial community are dynamically simulated through multi-model coupling, and the method is suitable for optimizing the design and operation parameters of a sewage treatment reactor and particularly has remarkable application value in regulation and control of a cascade fixed bio-membrane reactor.

The application discloses a kind of control fishing yield seal population recovery potential evaluation method and device, it is related to marine ecological protection and restoration field, mainly includes: four steps of modeling, predation rate calculation, fishing quantity reduction stage determination and seal population recovery potential evaluation.The application is based on Ecopath model, by introducing predation rate parameter, dynamically adjusts seal food habit matrix, reduces the data requirement of modeling, realizes the quantitative evaluation of fishing control measure protection benefit, provides practical method tool for seal population recovery potential evaluation.Therefore the seal population recovery potential evaluation method and device based on control fishing yield provided by the application have good seal population recovery potential evaluation ability, and can be widely applied to marine biological population resource recovery potential evaluation field.

The present invention provides a method for domesticating mandarin fish using large-scaled paraloach as transit bait, and belongs to the field of freshwater fish seed breeding. The mandarin fish domestication method provided by the present invention goes through four stages: starvation → live bait feeding → transit feeding → feed, and the transit feeding of mandarin fish involved includes: fresh dead loach coated with powder → fresh dead loach coated with powder + ice-fresh loach coated with powder → ice-fresh loach coated with powder + feed. The present invention uses loach as transit bait, which not only cleverly caters to the mandarin fish's unique visual response mechanism for feeding, but also significantly improves the feeding efficiency during the feed conversion process, makes full use of the loach's flexible body shape and ability to swim quickly in the water, and perfectly matches the mandarin fish seedlings' extremely high desire to prey on dynamic and active small aquatic organisms, opening up a new efficient and environmentally friendly way for the feed domestication of mandarin fish seedlings. The domestication procedure is highly replicable, with low loss of mandarin fish fry, high domestication rate, few diseases, fast growth of mandarin fish fry and excellent quality.

The present invention discloses a method for monitoring the changes in the ecological environment of urban plains based on the investigation of small mammals. First, after determining the pellet collection points of long-eared owls, the proportion of forest, shrub, grassland, and cultivated land coverage areas, biomass, and vascular plant species richness within the predation range area are obtained; then, based on the pellets of long-eared owls, the parameters for measuring the biodiversity index are calculated: the species richness of prey animals, the appearance frequency of prey animals in the pellets, the predation intensity of prey animals, and the biomass proportion of prey animals; finally, based on the above indicators, the comprehensive index of the ecological environment quality in the urban plain area is calculated to determine the changes in the ecological environment of the urban plain area. The use of this method solves the problem of the inability to long-term observe the biodiversity of small mammals, and provides technical support for long-term observing small mammals with good indicator functions to judge the changes in the comprehensive quality of the urban ecological environment.

The present invention relates to an in-situ biological purification system and method for treating eutrophic water bodies. The purification system comprises several biological purification modules installed in-situ within the water body. Each biological purification module includes a passive protection unit and an active protection unit. The passive protection unit comprises a plurality of fixed fish-repelling isolation devices, which together form a zooplankton protection zone within the water body. The active protection unit comprises a mobile, pursuit-type active fish-repelling device. Advantageously, the in-situ biological purification system continuously repels fish through fish-repelling signals such as bubbles, sound, and light, thereby forming an in-situ zooplankton protection zone in a specific area of the water body. This system fully utilizes the natural water surface to create a protective habitat for zooplankton, reduces predation intensity, increases zooplankton survival rate, biomass, and the proportion of large individuals, and replenishes zooplankton biomass throughout the lake or reservoir, thereby rapidly depleting algae in-situ and achieving the ultimate goal of water pollution control and the protection and restoration of the aquatic ecological environment.

The invention discloses a method and a device for inducing and domesticating bias swimming ability of large yellow croakers, and belongs to the technical field of marine biological resource conservation. The device comprises a lateral swimming ability induction domestication water tank; a T-shaped domestication swim lane is arranged in the domestication area and comprises a starting arm, a left arm area, a right arm area, a left fish collection area and a right fish collection area, wherein the left arm area and the right arm area are located on the two sides of the starting arm respectively. The left arm area and the right arm area are provided with first movable doors used for being communicated with or separated from the corresponding fish collecting areas respectively. A second movable door communicated with or separated from the temporary culture area is arranged on the starting arm; the flow generation area is provided with a flow generator and a flow equalizing pore plate, and the flow equalizing pore plate is arranged at the end part, far away from the temporary culture area, of the starting arm. The invention further provides a corresponding induction and domestication method, after the released juvenile fish is domesticated for a period of time, the lateral swimming capacity of the released juvenile fish in a natural sea area is improved, the predation efficiency of the released juvenile fish is improved, the predation risk of the released juvenile fish is reduced, and therefore the survival rate of the released juvenile fish is increased.

The application provides a breeding pond bird prevention device, which comprises a mounting framework and a protective net connected with the mounting framework; the mounting framework comprises two first supporting rods arranged in parallel with each other and two second supporting rods arranged in parallel with each other, the lower end of the second supporting rod is connected with an extension rod arranged at an angle with the second supporting rod and extending away from the first supporting rod; the protective net comprises a first net body, a second net body and a third net body connected in sequence; the two first supporting rods are connected through the first net body, the upper end of the first supporting rod and the upper end of the second supporting rod are connected through the second net body, and the upper end of the second supporting rod and the extension end of the extension rod are connected through the third net body. After the device is set, the first net body and the second net body can prevent birds from entering the shallow water area from the lower side of the third net body, the third net body forms a slope structure and covers the shallow water area, and birds can be prevented from standing on the shallow water area, thereby reducing the loss of fish and shrimp caused by bird predation.

The utility model relates to the technical field of freshwater fish breeding, and discloses a reservoir ecological freshwater fish rotifer preying device which comprises a material tank, a lower floating block for providing buoyancy is arranged at the bottom of the material tank, a motor is fixedly installed in the middle of the top side of the material tank, and six sets of discharging openings are formed in the bottom wall of the material tank in an array mode. A feeding assembly used for assisting in feeding rotifers is arranged in the material tank, a triggering assembly used for triggering and starting the feeding assembly is arranged in the middle of the supporting plate, and a photovoltaic panel used for providing power for all the components is arranged on the outer side of the material tank. Fish schools can be attracted to gather through the bionic bait, when the fish schools bite the bait, the guide rod can be driven to move downwards, so that the contacts make contact with one another, then the motor can be started, the gear disc rotates to drive the rotating rod to rotate, and then the spiral discharging rod is driven to rotate in the discharging opening to assist in rotifer throwing; therefore, fish schools can prey conveniently, and waste is avoided.

The utility model discloses a multi-chamber bait device which comprises a bait shell, the bait shell is provided with a trapping cavity and a trapping hole, the trapping cavity is communicated with the outside through the trapping hole, the bait shell is further provided with a plurality of trapping grooves formed in the bottom of the trapping cavity, the trapping grooves are mutually independent, and bait which is filled through a hot filling technology and has different ingredients is arranged in the trapping grooves respectively. The bait is tightly attached to the corresponding trapping groove. According to the multi-cavity bait device, the trapping grooves are formed in the bottom of the trapping cavity, and the bait with different ingredients is injected into the trapping grooves in a hot filling mode, so that the multi-cavity bait device can meet the predation preference of cockroaches of different varieties, and the trapping effect is good. And the baits are filled into the corresponding trapping grooves by adopting a hot filling process, so that the baits are tightly attached into the corresponding trapping grooves, and the situation that different baits roll and collide relative to the bait shell to cause odor mixing and influence the trapping effect is avoided.

The invention relates to the technical field of reservoir scheduling, and discloses a reservoir optimization scheduling method and device based on an improved piebald algorithm, and the method comprises the steps: constructing a reservoir optimization scheduling model; wherein the reservoir optimal scheduling model takes the water level of the hydropower station in each time period within the reservoir scheduling period as a decision variable; randomly generating an initialized population; wherein individuals in the initialized population represent the water level of the hydropower station in each time period within the reservoir dispatching deadline; iteratively updating the position of each individual in the initialized population by simulating the inhabiting and hovering behaviors, the diving behavior and the change of predation efficiency of the emerald; and when the iteratively updated population satisfies an iteration stop condition, determining an optimal reservoir scheduling scheme based on the iteratively updated population. According to the method, the problems of algorithm prematurity and local optimum can be effectively avoided, and the optimization efficiency of the reservoir scheduling scheme is improved.

This invention relates to the technical field of mandarin fish farming, and in particular to a feeding device for the domestication of mandarin fish, which is easy to operate and improves the predation efficiency of mandarin fish. It includes a mounting platform, a positioning ring, a storage box, a moving platform, a feeding tube, a feed pipe, a feeding block, a spring, and a drive mechanism. The positioning ring is coaxially mounted on the mounting platform. The storage box is coaxially rotatably mounted on the mounting platform via the positioning ring. Multiple sets of moving platforms are equidistantly slidably mounted on the bottom of the mounting platform. Multiple sets of feeding tubes are equidistantly mounted on the moving platforms. A feed pipe is installed at the inlet of each feeding tube. The feeding block is slidably mounted inside the shaft cavity of the feeding tube. Both ends of the spring are respectively connected to the feeding block and the shaft cavity wall of the feeding tube. The diameter of the shaft cavity of the feeding tube is slightly larger than the diameter of the feed pellets. The drive mechanism is mounted on the mounting platform and is respectively connected to the storage box and the multiple sets of feeding blocks.

A bionic bird-catching spider based on the coupling of degrees of freedom, with four bionic front legs connected to the head of the bionic torso; four bionic hind legs connected to the chest of the bionic torso; a bionic chelicera also provided at the very front end of the bionic torso A; a bionic spinneret provided at the rear end of the bionic torso A; the bionic torso is arranged in a quasi-elliptical shape, mimicking the real overall appearance of the wild tiger-striped bird-catching spider; the bionic walking legs are divided into a bionic hind leg of a crank-rocking block linkage eight-bar mechanism and a bionic front leg of a worm gear and worm linkage anti-quadrilateral, respectively using different bionic design principles to achieve the corresponding bionic target design requirements; the bionic chelicera adopts an independently designed electromagnetic transient control dead point four-bar mechanism to complete the predation action reliably and quickly; the liquid emission module is controlled by air pressure and can adjust the spraying angle in the vertical direction to increase its liquid emission range.

The utility model discloses an ortes fuscipes feeding device convenient to feed and clean. The ortes fuscipes feeding device comprises a first cavity, a second cavity, a third cavity and a water containing box. The first cavity is an activity space for the hunting otorhinus fulvidraco; the second cavity is a living prey activity space; the second cavity is located above the first cavity, the first cavity is arranged at the bottom of the second cavity, and the first cavity and the second cavity are detachably connected; the second cavity is arranged at the top opening of the first cavity; the first cavity, the second cavity and the third cavity form a relatively sealed space; the water containing box is used for feeding the hunting otorhinus fulvidraco with water; the water containing box is located in the third cavity in a penetrating mode. The living prey is separated from the activity space of the hunting ostis, so that predation injury or anti-predation risk of low-age nymphs of the hunting ostis can be effectively avoided, and the breeding survival rate can be increased.

The patented Animal Seed Deterrent System offers an innovative solution for protecting seeds from being eaten by animals such as rodents, wild boars, and birds. It uses fake seeds to attract animals and deter them from eating real seeds. These fake seeds are sown either before or at the same time as the real seeds and contain scents and materials that smell a certain way but are not suitable for consumption. The scents are permanently incorporated into the material to ensure long-term deterrence. In addition, the real seeds are coated with a special coating containing similar scents and materials to the fake seeds to enhance the deterrent effect.A unique feature of the system is that it takes bird predation into account. The fake seeds are visually similar to real seeds and are scattered on the surface to be found first by birds. This innovative method offers an effective, cost-efficient, and environmentally friendly solution for protecting seeds and promoting plant growth.

1. The name of the design product: wall-mounted predatory dish (NW-61). 2. The use of the design product: the design product is used for pet predation. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The application relates to the technical field of pest control, in particular to a natural enemy insect releasing device for forest pest control, which comprises a UAV body, a fixing seat fixed at the bottom end of the UAV body and a plurality of stainless steel pipe releasing barrels fixed at the bottom end of the fixing seat at equal angles. When the sealing cover plate is opened for releasing, the smooth material surface of the arc-shaped glass sheet contacts with insects, the surface of the arc-shaped glass sheet is free of fiber protrusions and has extremely low friction coefficient, crawling insects can smoothly climb to the releasing port, the climbing success rate is obviously improved, and the subsequent predation and breeding capacity is not affected. When the sealing cover plate is closed and releasing is not performed, the ground glass roller rotates to drive the ground glass surface to face the inside of the stainless steel pipe releasing barrel, sufficient climbing support points are provided for insects, the insects can climb to different heights of the inner wall of the stainless steel pipe releasing barrel, the problem that the insects are crowded and accumulated at the bottom of the stainless steel pipe releasing barrel is solved, and the body surface damage and suffocation risk caused by extrusion are avoided.

The invention relates to an omnivorous fish control method and application thereof, and belongs to the technical field of water ecological restoration. The invention provides a control method for omnivorous fishes. The control method comprises the following steps: putting carnivorous fishes into a small water body containing the omnivorous fishes; the mass ratio of the carnivorous fishes to the omnivorous fishes is 1: (1-3). According to the method, carnivorous fishes with a specific proportional relation are put into a small water body containing omnivorous fishes, so that the biomass of the omnivorous fishes can be remarkably reduced, a cascade effect is triggered, the predation of the omnivorous fishes on zooplankton is reduced, the biomass of the zooplankton is increased, the predation of the zooplankton on planktonic algae is increased, and the survival rate of the zooplankton is increased. Furthermore, the disturbance of omnivorous fishes to the bottom mud can be reduced, and the total suspended matter concentration is reduced, so that the effect of repairing the water quality is achieved.

The present invention discloses a method for rapid construction and efficient carbon sequestration of oyster reefs based on a predation-defense strategy in the field of marine environment restoration technology. The method for rapid construction and efficient carbon sequestration of oyster reefs based on a predation-defense strategy includes the following steps: S1: Investigating the composition structure of macrobenthos and nekton in the sea area for oyster reef construction; S2: Selecting indigenous oyster individuals over 2 years old in the target sea area as artificial breeding parent bodies; S3: Conducting temperature increase and ripening promotion on the selected oyster parent bodies, waiting for production at a constant temperature of 21-25 °C, changing the water by one full volume per day during the ripening promotion period, and the daily bait feeding amount is 20-30*10 4 cells of unicellular algae / ml. Through the application of the predation-defense strategy, the present invention induces the survival instinct of oysters to play, increases the material and energy expenditure of oysters for oyster shell growth, thereby enhancing the carbon sequestration ability of oysters per unit time and realizing the carbon sequestration function of oyster reefs with higher efficiency.

The utility model belongs to the technical field of predatory mites, and particularly relates to a thrip predatory mite feeding device which comprises a base, a feeding box and a supporting device. The supporting device is arranged on the surface of the feeding box and the surface of the base and comprises a plurality of supporting plates, the supporting plates are inserted into the inner surface of the feeding box, a storage box is arranged on the upper surfaces of the supporting plates, two storage blocks are fixedly connected to the two sides of the storage box correspondingly, and a separating device is arranged at the bottom end of the base and comprises a water tank. The upper surface of the water tank is fixedly connected with the bottom end of the base. Supporting frames are fixedly connected to the four corners of the bottom end of the water tank. By arranging the whole device, predatory mites can be bred in a relatively uniform mode, so that large-scale breeding is facilitated, meanwhile, the position of the storage box can be conveniently adjusted so as to adapt to different breeding requirements, the breeding box can be conveniently disassembled and assembled through part of parts of the supporting device, and thus the breeding box can be conveniently cleaned.

The invention discloses an application of an lprR gene in regulating and controlling the predation capability of stenotrophomonas maltophilia. The invention provides a substance for inhibiting or reducing or down-regulating the content or activity of LprR protein, or a substance for inhibiting or reducing or down-regulating the expression of an LprR protein coding gene, and any one of the following applications: 1) improving the predatory ability of stenotrophomonas maltophilia; experiments prove that after the lprR gene is knocked out, the predatory ability of the mutant under the hungry condition is remarkably improved, the predatory ability of a complementary strain basically recovers to be consistent with that of a wild type, and in an NYG culture medium, the predatory ability of the mutant, the predatory ability of the complementary strain and the predatory ability of the wild type are not remarkably different.

The present invention discloses a shoal structure for attracting wading birds, comprising a shoal area formed by being constructed on the shore and surrounded by a shoal outer wall, wherein a microhabitat structure is arranged in the shoal area; a maze area is constructed in the shoal area, wherein the maze area consists of a main maze passage and a plurality of side maze passages connected thereto; a plurality of entrances and exits to the shoal area are arranged on the shoal outer wall; the microhabitat structure comprises an annular microhabitat enclosure constructed in the shoal area, wherein the area surrounded by the microhabitat enclosure forms a microhabitat water area, wherein a plurality of plant planting constraint rings are fixedly arranged in the microhabitat water area; the maze-style shoal structure can enrich surrounding suitable aquatic animals in the shoal area, thereby improving the predation efficiency of target wading birds, enhancing their population breeding capacity, expanding the animal landscape and ecological restoration effect, and at the same time providing convenience for the investigation and monitoring of surrounding wading birds, especially rare species of wading birds.

The present invention relates to the technical field of natural enemy insect breeding, and particularly to a method, feed and device for breeding **Pristhesancus plagipennis** using wingless fruit flies. The present invention provides a method for breeding **Pristhesancus plagipennis** using wingless fruit flies, including: breeding **Pristhesancus plagipennis** with wingless fruit fly adults. Through experimental research, the present invention discovers that the predation preference of **Pristhesancus plagipennis** is that it prefers to prey on wingless fruit fly adults. Based on the predation characteristics of **Pristhesancus plagipennis** in different insect states, the present invention uses wingless fruit fly adults to breed **Pristhesancus plagipennis**, eliminating the cumbersome steps of planting host plants to breed prey, reducing the breeding cost, and improving the efficiency of breeding **Pristhesancus plagipennis**. In addition, by using the device provided by the present invention, it is possible to complete the entire generation of breeding **Pristhesancus plagipennis** with wingless fruit flies indoors.

The utility model relates to the field of aquaculture, and discloses an aquaculture cage which comprises a first mounting frame, the top of the first mounting frame is in lap joint with a second mounting frame, and a first screen is inserted in the periphery of the surface of the first mounting frame; the adjusting mechanism comprises a connecting assembly, the bottom of the connecting assembly is in lap joint with the top of the second mounting frame, a movable frame is rotationally connected to one side of the connecting assembly, a second screen is fixedly connected to the inner wall of the movable frame, inserting grooves are formed in the two sides of the second mounting frame, and a plug pin is slidably connected to the inner wall of the connecting assembly. And a first spring is lapped on the surface of the bolt. According to the aquatic product breeding device, the breeding areas of the device are adjusted through movement of the movable frame, after the space in the device is divided into the multiple breeding areas, the device can breed multiple types of aquatic products at the same time, the practicability of the device is improved, and the situation that the aquatic products prey one another can be avoided.

This invention relates to the field of forestry pest and disease control technology, specifically to an intelligent simulation system for the control effect of natural enemies in forestry pest and disease control. The system includes an ecological monitoring integration module, a behavior stage discrimination module, a predation rate inversion module, a stage index mapping module, and a parameter feedback correction module. Based on forest pest monitoring nodes, it analyzes the pest quantity information uploaded by the nodes and determines the sampling point location corresponding to signal changes. This invention integrates forest pest monitoring data, natural enemy activity, and environmental changes in a time series, and introduces behavior stage discrimination based on ecological state information. Combined with paired statistics of natural enemy behavior and pest quantity, it dynamically reveals the ecological response relationship under different behavior stages. The simulated data can automatically adjust the parameter set according to periodic monitoring differences, and the stage effects and trends are promptly mapped into management indicators, making the simulation of control effects more stage-discriminative and ecologically adaptable.

The invention discloses a method for preventing and controlling tomato leaf miners by using adult ladybirds, which comprises the following steps: preying larvae of the first, second and third instar of the tomato leaf miners in a submerged channel by using the adult ladybirds in a room, and preying the larvae of the first, second and third instar of the tomato leaf miners in the submerged channel by using the adult ladybirds; and in the field, releasing the ladybird adults by using a cage method to prevent and control the tomato leaf miners. According to the method, it is clear that the adult ladybird can prey on the first, second and third instar larvae of the tomato leaf miner in the subterranean channel, a Holding II type predation function reaction model is fitted, and a theoretical basis is provided for field release of the adult ladybird to prevent and control the tomato leaf miner. The field prevention and control effect of the heterodyea axyridis on the tomato leaf miner is defined, and a theoretical basis is provided for green prevention and control of the tomato leaf miner and further development and utilization of the heterodyea axyridis. According to the method, the heterodyea axyridis can be used as one of superior natural enemies for preventing and controlling the tomato leaf miners, the tomato leaf miners are prevented and controlled for a long time, pesticide pollution is reduced, pests are prevented from generating drug resistance, and a green prevention and control technology of agricultural pests is facilitated.

The invention discloses a breeding method of chisodochidae. According to the method, on the basis that the theoretical daily maximum predation amount of the tenebrio molitor on the hyphantria cunea young larvae is defined, the tenebrio molitor larvae are cut into segments to serve as substitute feed of the hyphantria cunea for artificial propagation of the hyphantria cunea, then the natural enemy can be used for preventing and treating 1-2 instar larvae of the hyphantria cunea, the hyphantria cunea can be effectively controlled by means of the predation characteristic of the natural enemy, and the method is suitable for large-scale popularization and application. The practical significance is realized.

To provide the construction and a method of a natural farm that gives no stress to an aquatic organism, causes no risk of disturbing an environment due to escape, is safe, and has low costs by installing an escape and hiding place of a juvenile fish, protecting the juvenile fish, improving a survival rate of the juvenile fish, culturing the juvenile fish by natural predation of an organism, employing water quality with natural purification action, and culturing the juvenile fish in the same ecosystem as that in the ambient, and to create a rich fishing place in a coast by discharging deep ocean water onto a front layer of a sea level having poor nutrition.SOLUTION: Proliferation is achieved by protecting a juvenile fish by providing: a surrounding part provided in a land side water area of an offshore breakwater block, having no bottom surface, having a lower end edge portion always contacting a water bottom, and having an upper end edge portion always being over the water level; and a hiding place for a juvenile fish that has entered the place through a clearance part, that is provided in the surrounding part, and to and from which a juvenile fish can enter and exit and an adult fish cannot enter and exit, and by fertilizing the periphery of the surrounding part by a deep water upwelling device.SELECTED DRAWING: Figure 1