A device and method for the propagation, release, and rewilding training of large yellow croaker fry.

Abstract

This invention discloses a device and method for the propagation, release, and rewilding training of large yellow croaker fry, relating to the field of marine biological resource conservation technology. The device includes: a water tank containing water, with multiple artificial reefs placed inside; a light source positioned above the water tank; multiple wave-making pumps evenly distributed along one side of the inner wall of the water tank; a release structure for releasing predator pheromones into the water tank; a camera mounted on the inner wall of the water tank; and a controller electrically connected to the camera, light source, and wave-making pumps. The camera collects behavioral characteristic information of the large yellow croaker during rewilding training and sends this information to the controller. A fish behavior analysis system comprehensively analyzes the swimming and reef usage of the large yellow croaker fry in the water tank to determine the effectiveness of the rewilding training. The advantages of this invention are enhanced ability of large yellow croaker fry to adapt to the marine environment and improved survival rate of released fry.

Description

Technical Field

[0001] This invention relates to the field of marine biological resource conservation technology, specifically to a device and method for the propagation, release, and rewilding training of large yellow croaker fry. Background Technology

[0002] Large yellow croaker, also known as yellow croaker or cucumber fish, belongs to the phylum Chordata, class Osteichthyes, order Perciformes, and family Sciaenidae. It is one of my country's traditional "four major marine products" and the most farmed marine fish in the country. Although artificial propagation and release has become an important means of restoring natural fish resources and expanding wild populations, since the successful artificial breeding of large yellow croaker, especially in the last decade or so, while some progress has been made in supplementing wild resources, the release effect has not yet reached expectations, and its wild population has not recovered to its full potential.

[0003] Fish fry used for stock enhancement and release in the market are all artificially bred commercially. Because artificially bred fry lack swimming ability, feeding ability, and anti-predation ability, they cannot adapt to the natural marine environment after release. For example, they cannot adapt to ocean currents, lack predation ability, and cannot effectively avoid predators, resulting in a low survival rate in the wild. This is a common problem currently faced in fish stock enhancement and release.

[0004] Current international experience with the stock enhancement and release of species such as Murray cod and Arkansas dart bass demonstrates that targeted artificial rewilding training of fish fry before release can effectively improve their adaptability and survival rate after entering natural water bodies. Therefore, it is necessary to develop a cost-effective, efficient, and practical method for pre-release rewilding training of fry, which has practical value for improving the survival rate of important economic fish species in my country's stock enhancement and release programs and for the sustainable development of fishery resources. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a device and method for the propagation, release, and rewilding training of large yellow croaker fry, enhancing the ability of large yellow croaker fry to adapt to the marine natural environment and improving the survival rate of released fry.

[0006] This invention provides a device for the propagation, release, and rewilding training of large yellow croaker fry, comprising:

[0007] A water tank for holding water, wherein multiple fish reefs are placed in the water tank;

[0008] A light source is positioned above the water tank to simulate the periodic changes in light intensity under natural conditions.

[0009] Multiple wave-generating pumps are evenly arranged on one side of the inner wall of the water tank to agitate the water flow within the tank.

[0010] A release structure is used to release predator pheromones into the water tank;

[0011] A camera is mounted on the inner wall of the water tank;

[0012] The controller is electrically connected to the camera, the light source, and multiple wave-making pumps. The camera is used to collect behavioral characteristic information of large yellow croaker during rewilding training and send this behavioral characteristic information to the controller. The controller is equipped with a storage unit and an analysis unit. The storage unit is used to store the behavioral characteristic information of large yellow croaker during rewilding training collected by the camera and the behavioral characteristic information of large yellow croaker in the marine ecosystem. The analysis unit compares the collected behavioral characteristic information of large yellow croaker during rewilding training and the behavioral characteristic information of large yellow croaker in the marine ecosystem stored in the storage unit, and comprehensively analyzes the swimming and reef usage of large yellow croaker fry in the tank through a fish behavior analysis system to analyze and judge the effect of its rewilding training.

[0013] Preferably, the delivery structure includes:

[0014] A pipe body, one end of which is located inside the water tank, is close to the wave generator pump;

[0015] A storage tank is disposed on the side wall of the water tank. The storage tank stores enemy pheromones. A water pump is installed in the storage tank. The water pump is electrically connected to the controller. The output end of the water pump is connected to the other end of the pipe. The water pump is used to release the enemy pheromones in the storage tank into the water tank through the pipe.

[0016] Preferably, the predator pheromone is a diluted solution of ground meat from sea bass, eel, and grouper.

[0017] Preferably, it further includes:

[0018] The shell is used to hold feed, and the shell has multiple through holes. The shell is placed in the water tank when in use.

[0019] Preferably, the bottom of the water tank is connected to an inlet pipe and a drain pipe. The inlet pipe is used to bring in water, and the drain pipe is used to drain water and discharge the excrement and food residue of the large yellow croaker fry.

[0020] A method for the propagation and rewilding training of large yellow croaker fry, using a large yellow croaker fry propagation and rewilding training device, includes the following steps:

[0021] Place the large yellow croaker fry to be trained into the water tank;

[0022] The controller controls the light intensity and light cycle of the light source to simulate the lighting environment of a marine ecosystem.

[0023] The controller controls the operation of multiple wave-making pumps to simulate the water flow environment of a marine ecosystem and train the swimming ability of large yellow croaker fry.

[0024] Feeding juvenile large yellow croakers trains their hunting abilities;

[0025] The controller controls the water pump to release the predator pheromones in the storage tank into the water tank through the pipe, thereby training the large yellow croaker fry to avoid being preyed upon.

[0026] The camera collects behavioral characteristic information of the large yellow croaker fry during the above-mentioned wilding training and sends the behavioral characteristic information to the controller;

[0027] The analysis unit within the controller compares the collected behavioral characteristic information of large yellow croaker during rewilding training stored in the storage unit with the behavioral characteristic information of large yellow croaker in the marine ecosystem. Through the fish behavior analysis system, it comprehensively analyzes the swimming and reef usage of large yellow croaker fry in the tank and analyzes and judges the effect of its rewilding training.

[0028] If the training effect after analysis meets the standard, the large yellow croaker fry will be released into the wild; if the training effect after analysis does not meet the standard, the large yellow croaker fry will continue to be trained.

[0029] Preferably, training the swimming ability of large yellow croaker fry includes the following steps:

[0030] The controller controls the flow rate of multiple wave-generating pumps to be between 0.2 m / s and 0.25 m / s, forming a gentle water flow. After 24-48 hours, the adaptation of the large yellow croaker fry is observed.

[0031] When the difference between the swimming speed of the large yellow croaker fry in the tank and the flow rate of the wave pump is within ±0.02 m / s, the flow rates of multiple wave pumps are gradually increased. The flow rates of multiple wave pumps are adjusted every 2 hours, and the flow rate difference is 0.02 m / s-0.05 m / s each time. The flow rate difference is equal each time. When the flow rate of the wave pump is adjusted to 0.45 m / s, it is recorded as one round of uniform speed training.

[0032] When the difference between the swimming speed of the large yellow croaker fry in the tank and the flow rate of the wave pump is within ±0.02 m / s, the flow rates of multiple wave pumps are gradually increased. The flow rates of multiple wave pumps are adjusted every 2 hours, and the flow rate difference is 0.02 m / s-0.05 m / s each time. The flow rate difference is not equal each time. When the flow rate of the wave pump is adjusted to 0.45 m / s, it is recorded as one round of variable speed training.

[0033] During the 4-6 day acclimatization process, the fish fry undergo a round of uniform speed training one day and a round of variable speed training every other day, alternating between these two methods to train their swimming ability.

[0034] Preferably, training large yellow croaker fry to hunt by feeding them includes the following steps:

[0035] During uniform or variable speed training, a small amount of Artemia worms are placed into the shell and the shell is placed into the water tank. After 1 hour, a certain amount of pellet feed is added according to the feeding situation.

[0036] Repeat the above feeding method for 3-5 days, gradually increasing the amount of brine shrimp and gradually decreasing the amount of pellet feed each day.

[0037] From day 6 to day 10, completely replace the pelleted feed with brine shrimp;

[0038] After the 10th day, gradually reduce the feeding of brine shrimp, and at the same time put shrimp larvae into the tank, increasing the amount of shrimp larvae day by day until the shrimp larvae completely replace the brine shrimp.

[0039] Preferably, training large yellow croaker fry to avoid predation includes the following steps:

[0040] The controller controls the flow rate of multiple wave-generating pumps to be between 0.2 m / s and 0.25 m / s, forming a gentle water flow, and observes the adaptation of the large yellow croaker fry.

[0041] When the difference between the swimming speed of the large yellow croaker fry in the tank and the flow rate of the wave pump is within ±0.02m / s, the controller controls the water pump to work and release a certain amount of predator pheromones from the storage tank into the tank through the pipe, so that the large yellow croaker fry are threatened by predation and escape quickly by bursting out of the water.

[0042] The camera collects behavioral characteristic information of the large yellow croaker fry within 10 seconds and sends it to the controller. The controller calculates the burst swimming speed of the fry based on the swimming distance of the fry within 10 seconds.

[0043] When the large yellow croaker fry exhibit a rapid escape response and then return to a steady pace after a period of time, it is recorded as one round of escape training. During the domestication period, six rounds of escape training are conducted at intervals every day.

[0044] When the swimming distance of the large yellow croaker fry under predation stress is consistently 25-30m within 1 minute for 3 consecutive times, the training of their ability to avoid being preyed is terminated.

[0045] Preferably, when the wave pump flow rate is 0.45 m / s, the large yellow croaker fry to be trained swim against the current for 10 minutes, and the swimming speed variation does not exceed ±0.02 m / s. At the same time, within 6-10 minutes after the introduction of predator pheromones, 45%-60% of the large yellow croaker fry are active within the reef, then the training effect meets the standard.

[0046] Compared with the prior art, the present invention discloses a device and method for the propagation, release, and rewilding training of large yellow croaker fry, the beneficial effects of which are:

[0047] This invention is used to domesticate the swimming, feeding and predation evasion abilities of large yellow croaker fry, enhance the ability of artificially bred and released fry to adapt to the marine natural environment, improve the survival rate of released fry, and thus enhance the propagation effect of large yellow croaker after release. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of the present invention;

[0050] Figure 2 This is a schematic diagram of the delivery structure of the present invention.

[0051] The meanings of the labels in the diagram are as follows: 1—Controller, 2—Light source, 3—Water tank, 4—Dispensing structure, 41—Pipe body, 42—Water pump, 43—Storage tank, 5—Camera, 6—Wave pump, 7—Artificial reef, 8—Inlet pipe, 9—Drain pipe, 10—Shell. Detailed Implementation

[0052] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] Furthermore, in the description of this invention, "a plurality of" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0056] Example 1

[0057] This invention provides a device for the propagation, release, and rewilding training of large yellow croaker fry, such as... Figure 1 As shown, it includes: a water tank 3, a reef 7, a light source 2, a wave pump 6, a deployment structure 4, a camera 5, and a controller 1. The water tank 3 is used to hold water and serves as a container for cultivating and domesticating large yellow croaker fry. The water tank 3 is a rectangular or oval-shaped cement pond or fiberglass tank with a volume of 15m³. 3The above describes the process of adding water to the tank 3, which contains suitable water for large yellow croaker fry. The inner wall of the tank 3 is painted with a non-toxic, eco-friendly paint to reduce the need for oxygenation equipment such as air stones and air tubes, making the overall acclimatization environment closer to the real marine ecosystem. This accelerates the adaptation of the large yellow croaker fry and reduces stress. Multiple artificial reefs 7 are placed in the tank 3. These reefs have many holes for the fry to hide in. The reefs 7 are heavy enough to sink to the bottom of the tank 3. 10-15 reefs 7 are placed depending on the area of ​​the tank 3. The reefs 7 can be glued to the bottom of the tank 3. The reefs 7 come in various shapes, including squares and triangles, and are hollow inside with circular or other surface features. Various irregular holes, including squares and triangles (three times the length of the fish's body), are used in the fish reef 7. The height of the reef 7 is 1 / 3 to 1 / 2 of the water depth in the tank 3, simulating reefs or shelters in a marine habitat. The light source 2 is located above the tank 3 to simulate the periodic changes of light under natural conditions. The light source is an LED light, using white and yellow light sources that can simulate natural light. The light intensity is adjustable, and 4-6 LED lights can be set according to the size of the tank 3. The light cycle is set to 12 hours (light) and 12 hours (dark) to simulate the natural light environment and cycle. Multiple wave pumps 6 are evenly distributed on one side of the inner wall of the tank 3 to agitate the water flow in the tank 3. The wave pumps 6 are for raising fish. The pump body commonly used inside the cylinder can agitate the water flow speed to simulate the water flow speed in the natural environment. Multiple wave-making pumps 6 are positioned on one side of the water tank 3 to avoid water flow collisions and simulate the direction of natural water flow. These wave-making pumps 6 can be set at different heights and angles to better simulate natural water flow. The wave-making pumps 6 can be the SW or OW models from Jiebao wave-making pumps, or QZB submersible axial flow pumps, Shenpeng electronic wave-making pumps, or other models. The appropriate model of wave-making pump 6 can be selected based on the size of the water tank 3. The number of wave-making pumps 6 (2-4 sets recommended) should be adjusted according to the area of ​​the water tank 3, positioned along the long axis or diagonally. The pump speed and the number of wave-making pumps 6 can be adjusted accordingly. The number of devices is adjusted to regulate the water flow rate during training; the release structure 4 is used to release predator pheromones into the tank 3 to train the large yellow croaker fry to escape and avoid predation; the camera 5 is set on the inner wall of the tank 3, about 75cm from the bottom of the tank 3. The camera 5 is an industrial-grade infrared high-speed waterproof camera with a high waterproof level, which can work underwater. Its position, height and shooting angle can be adjusted. The number of cameras is 2-4 (one is fixed at the wave pump 6, and the rest are set freely according to the area of ​​the tank 3). By setting up the camera 5, the training of the large yellow croaker fry can be observed, the fish dynamics in the tank 3 can be monitored 24 hours a day, and the video can be periodically saved to the hard drive.The controller 1 is electrically connected to the camera 5, the light source 2, and multiple wave pumps 6. The controller 1 can be a central computer that can process data, images, etc. The camera 5 is used to collect behavioral characteristic information of the large yellow croaker during rewilding training and send the behavioral characteristic information to the controller 1. The controller 1 is equipped with a storage unit and an analysis unit. The storage unit is used to store the behavioral characteristic information of the large yellow croaker during rewilding training collected by the camera 5 as well as the behavioral characteristic information of the large yellow croaker in the marine ecosystem. The analysis unit compares the collected behavioral characteristic information of the large yellow croaker during rewilding training and the behavioral characteristic information of the large yellow croaker in the marine ecosystem stored in the storage unit. Through the fish behavior analysis system, it comprehensively analyzes the swimming of the large yellow croaker fry in the tank 3 and the use of the artificial reef 7 to analyze and judge the effect of its rewilding training. This device is used for the breeding and rewilding training of large yellow croaker fry. Before release, the fry are trained in swimming, feeding, and escape abilities. Before use, multiple artificial reefs 7 are arranged in the tank 3 to simulate natural reefs for hiding. Cameras 5 are installed in the tank 3 to capture the behavioral characteristics of the large yellow croaker fry from all angles. During use, the fry are placed in the tank 3. The light source 2 is adjusted to simulate the light cycle changes under natural conditions, and the wave pump 6 is activated to simulate the flow rate and fluctuations of water under natural conditions to train the fry's swimming ability. Predator pheromones can be released into the tank 3 through the release structure 4 to train the fry's escape ability, i.e., predation ability. Feed is also added to the tank 3 to train their feeding ability. During the above training process, the camera 5 records the fry's behavioral characteristics. The final training effect is obtained by comparing and analyzing the data with a fish behavior analysis system. When the training meets the standards, the trained large yellow croaker fry can be released into the wild. Fish analysis systems technology is already quite mature, and commercially available software can meet the requirements, such as Nordas's animal movement tracking system (Ethovision XT).

[0058] This embodiment provides a specific structure for the delivery structure 4, such as... Figure 2As shown, the release structure 4 further includes: a pipe 41, a storage tank 43, and a water pump 42. One end of the pipe 41 is located inside the water tank 3, near the wavemaker pump 6. The pipe 41 is a 50mm diameter PVC pipe. The storage tank 43 is located on the side wall of the water tank 3 and stores predator pheromones. The water pump 42 is installed inside the storage tank 43 and is electrically connected to the controller 1. The output end of the water pump 42 is connected to the other end of the pipe 41. The water pump 42 is used to release the predator pheromones from the storage tank 43 into the water tank 3 through the pipe 41. The water pump 42 is a 200-400W water pump. When predation training is needed, the water pump 42 is activated to release the predator pheromones from the storage tank 43 into the water tank 3 through the pipe 41, thereby training the large yellow croaker fry to escape and avoid predation. The pipe body 41 is close to the wave pump 6, which allows the predator pheromone to diffuse more quickly and evenly in the water tank 3 when it is released.

[0059] Furthermore, the predator pheromone is a diluted solution of ground muscle from sea bass, conger eel, and grouper. The release of this predator pheromone can put large yellow croaker fry into an alert state.

[0060] Furthermore, it also includes: a shell 10 for holding feed, with multiple through holes on the shell 10 to facilitate the leakage of feed from inside the shell 10; the shell 10 is placed in the water tank 3 during use. When the shell 10 is placed in the water tank 3, a wave pump 6 can be turned on to create water flow, allowing the shell 10 to move within the water tank 3. Simultaneously, the feed leaking from the multiple through holes can disperse across the surface of the water in the tank 3, facilitating the training of the large yellow croaker fry's feeding ability.

[0061] like Figure 2 As shown, the bottom of the water tank 3 is connected to an inlet pipe 8 and a drain pipe 9. The inlet pipe 8 is used for water intake, and the drain pipe 9 is used for drainage and discharge of excrement and food residue from the large yellow croaker fry.

[0062] Example 2

[0063] A method for the propagation and rewilding training of large yellow croaker fry, using the large yellow croaker fry propagation and rewilding training device in Example 1, includes the following steps:

[0064] Step 1: Place the large yellow croaker fry to be trained into tank 3;

[0065] Step 2: Controller 1 controls the light intensity and light cycle of light source 2 to simulate the light environment and cycle of the marine ecosystem, so as to train the large yellow croaker fry in a more realistic living environment.

[0066] Step 3: Controller 1 controls multiple wave pumps 6 to work, simulating the water flow environment of the marine ecosystem, training the swimming ability of the large yellow croaker fry, so that the large yellow croaker fry can adapt to the real ocean water flow speed after release.

[0067] Step 4: Feed the fry to train their hunting ability;

[0068] Step 5: Controller 1 controls water pump 42 to release the predator pheromone in storage tank 43 into water tank 3 through pipe 41, training the large yellow croaker fry to avoid being preyed upon. Specifically, this is achieved through reef 7. After the predator pheromone is released into water tank 3, the large yellow croaker fry need to hide in reef 7 to train their evasion ability.

[0069] Step 6: Camera 5 collects behavioral characteristic information of the large yellow croaker fry during the above-mentioned rewilding training and sends the behavioral characteristic information to controller 1;

[0070] Step 7: The analysis unit in controller 1 compares the collected behavioral characteristics information of large yellow croaker during rewilding training with the behavioral characteristics information of large yellow croaker in the marine ecosystem stored in the storage unit. Through the fish behavior analysis system, it comprehensively analyzes the swimming of large yellow croaker fry in tank 3 and the use of artificial reef 7 to analyze and judge the effect of its rewilding training.

[0071] Step 8: If the training effect after analysis meets the standard, release the large yellow croaker fry into the wild; if the training effect after analysis does not meet the standard, continue training the large yellow croaker fry or eliminate them.

[0072] This device can train the swimming, feeding, and predation evasion abilities of released large yellow croaker fry, enhance the ability of artificially bred and released fry to adapt to the marine natural environment, improve the survival rate of released fry, and thus enhance the propagation effect of large yellow croaker after release.

[0073] This embodiment provides a method for training the swimming ability of large yellow croaker fry, including the following steps:

[0074] Step 1: Controller 1 controls multiple wave pumps 6 to maintain a flow rate of 0.2m / s-0.25m / s to create a gentle water flow. After 24h-48h, observe the adaptation of the large yellow croaker fry to ensure that the fry can adapt to the water flow with a certain velocity.

[0075] Step 2: When the difference between the swimming speed of the large yellow croaker fry in tank 3 and the flow rate of wave pump 6 is within ±0.02 m / s, that is, when the swimming speed of the large yellow croaker fry is close to the flow rate of wave pump 6, it means that the large yellow croaker fry have adapted to the flow rate in tank 3. Gradually increase the flow rate of multiple wave pumps 6, adjusting the flow rate of multiple wave pumps 6 every 2 hours. The flow rate difference of each adjustment is 0.02 m / s-0.05 m / s, and the flow rate difference is equal each time. For example, increase by 0.02 m / s each time. When the flow rate of wave pump 6 is adjusted to 0.45 m / s, it is recorded as one round of uniform speed training.

[0076] Step 3: When the difference between the swimming speed of the large yellow croaker fry in tank 3 and the flow rate of wave pump 6 is within ±0.02 m / s, the swimming speed of the large yellow croaker fry is close to the flow rate of wave pump 6. Gradually increase the flow rate of multiple wave pumps 6. Adjust the flow rate of multiple wave pumps 6 every 2 hours. The flow rate difference for each adjustment is 0.02 m / s-0.05 m / s, and the flow rate difference for each adjustment is not equal. For example, if the flow rate is increased by 0.02 m / s in this adjustment, it will be increased by 0.04 m / s in the next adjustment. The flow rates are not equal in the two adjacent adjustments. When the flow rate of wave pump 6 is adjusted to 0.45 m / s, it is recorded as one round of variable speed training.

[0077] Step 4: During the 4-6 day acclimatization process, conduct a round of uniform speed training every day and a round of variable speed training every other day to alternately train the swimming ability of the large yellow croaker fry.

[0078] By adjusting the number, speed, and direction of the wave-generating pumps 6, different flow rates are created within the water tank 3 to form circulation or waves, allowing the large yellow croaker fry to gradually adapt to the changing water flow patterns, improving their independent swimming ability and enabling them to actively feed on formulated feed. The value of 0.45 m / s represents the maximum swimming speed that the large yellow croaker fry can achieve without exhaustion; adjusting the water flow to 0.45 m / s can train their swimming speed. If the large yellow croaker fry show signs of exhaustion during the swimming ability training process, that stage of training should be immediately stopped, and the water flow speed should be adjusted appropriately.

[0079] Example 3

[0080] As a further improvement on Example 2, this example provides a method for training the predatory ability of large yellow croaker fry by feeding them feed, including the following steps:

[0081] Step 1: During the uniform speed training or variable speed training, simultaneously place a small amount of brine shrimp into the shell 10 and put the shell 10 into the water tank 3. After 1 hour, supplement with a certain amount of pellet feed according to the feeding situation.

[0082] Step 2: Repeat the above feeding method for 3-5 days, gradually increasing the amount of brine shrimp and gradually decreasing the amount of pellet feed each day.

[0083] Step 3: From day 6 to day 10, completely replace the pelleted feed with brine shrimp;

[0084] Step 4: After the 10th day, gradually reduce the feeding of brine shrimp, and at the same time put shrimp larvae into tank 3, and increase the amount of shrimp larvae every day until the shrimp larvae completely replace the brine shrimp.

[0085] The above-mentioned method for training the predation ability of large yellow croaker fry mainly involves, after the fry have adapted to the environment of tank 3, feeding them with a combination of pellet feed and live bait (shrimp fry or brine shrimp) based on their feeding habits. The proportion of live bait is then gradually increased until they are fully accustomed to it. The amount of pellet feed is then gradually reduced to enhance their autonomous predation ability, allowing them to gradually adapt to the marine environment in terms of bait type and predation capacity. Specifically, during feeding, the feed is placed inside the shell 10, and the wave pump 6 is activated simultaneously. The water flow causes the shell 10 to move irregularly within the tank 3, allowing the feed to leak more easily from the openings, thus encouraging the fry to actively feed and developing their predation ability. Furthermore, training their predation ability is conducted simultaneously during uniform or variable-speed training to better simulate the predation behavior under natural water flow conditions.

[0086] In this embodiment, the other structures are the same as in embodiment 2, except that optimizations have been made to embodiment 2.

[0087] Example 4

[0088] As a further improvement on Example 2, the training of large yellow croaker fry to avoid predation includes the following steps:

[0089] Step 1: Controller 1 controls multiple wave pumps 6 to maintain a flow rate of 0.2m / s-0.25m / s to create a gentle water flow. Observe the adaptation of the large yellow croaker fry. After the large yellow croaker fry adapt to the flow rate, train them to escape.

[0090] Step 2: When the difference between the swimming speed of the large yellow croaker fry in the tank 3 and the flow rate of the wave pump 6 is within ±0.02m / s, the swimming speed of the large yellow croaker fry is close to the flow rate of the wave pump 6. The controller 1 controls the water pump 42 to work and release a certain amount of predator pheromones from the storage tank 43 into the tank 3 through the pipe 41, so that the large yellow croaker fry will be threatened by predation and escape quickly by bursting swimming.

[0091] Step 3: Camera 5 collects behavioral characteristic information of the large yellow croaker fry within 10 seconds and sends it to controller 1. Controller 1 calculates the fry's burst swimming speed based on the swimming distance within 10 seconds. The calculation formula is "s=vt", where s is the distance swam within 10 seconds, t is the time (10 seconds), and v is the speed (the fry's burst swimming speed).

[0092] Step 4: When the large yellow croaker fry exhibit a rapid escape reaction and then return to a constant speed after a period of time, that is, when they gradually reduce their swimming speed until it is close to the flow rate of wave pump 6, this is recorded as one round of escape training. During the domestication period, six rounds of escape training are conducted every day at intervals.

[0093] Step 5: When the swimming distance of the large yellow croaker fry under predation stress is consistently 25-30m within 1 minute for 3 consecutive times, the training of their ability to avoid being preyed on ends.

[0094] Based on the area and fry density of tank 3, a fixed amount of tissue mixture of ferocious predatory fish is released at a fixed time every day to create predation pressure on the large yellow croaker fry. Their ability to avoid predation is assessed through specific anti-predation behaviors (freezing time and utilization of reef 7), ultimately improving their survival rate after release.

[0095] Furthermore, the rewilding training effect of large yellow croaker fry in tank 3 was comprehensively analyzed using a fish behavior analysis system. When the flow velocity of wave pump 6 was 0.45 m / s, the large yellow croaker fry to be trained could swim against the current for 10 minutes, and the swimming speed variation did not exceed ±0.02 m / s. At the same time, when 45%-60% of the large yellow croaker fry were active within the reef 7 within 6-10 minutes after the introduction of predator pheromones, the training effect met the standard. In addition, the swimming of large yellow croaker fry and the use of artificial reef 7 were analyzed using a fish behavior analysis system. Large yellow croaker fry that met the training standards still needed to undergo actual training. During training, wave pump 6 was turned on. When the large yellow croaker fry swam against the current for more than 10 minutes at a water flow speed of 0.45 m / s, and the survival rate of the trained fish reached more than 75% after adding natural enemy fish to the tank 3 for 1 hour, the training effect met the standard and they could be released. When the large yellow croaker fry swam against the current for less than 10 minutes at a water flow speed of 0.45 m / s, or the survival rate of the trained fish reached less than 75% after adding natural enemy fish to the tank for 1 hour, the training effect did not meet the standard, and they needed to be trained again or eliminated.

[0096] Furthermore, the amount of predator pheromones released into tank 3 is 5%-8% of the water volume in tank 3.

[0097] In this embodiment, the other structures are the same as in embodiment 2, except that optimizations have been made to embodiment 2.

[0098] This invention provides a more realistic marine environment for the rewilding training of released fry, comprehensively improving their survival ability in the wild through environmental adaptability, feed type conversion, enhanced swimming ability, improved predation ability, and better avoidance of predators. Based on the biological characteristics of large yellow croaker and its predator signal recognition mechanism, predator pheromones are introduced in a targeted manner to more efficiently train their ability to avoid predator stress. Simultaneously, in-depth video and image analysis is conducted on the behavioral characteristics of large yellow croaker fry during rewilding training to establish a database, providing a reference for studying the growth, development, and adaptability assessment of released large yellow croaker fry, and also providing theoretical data for the artificial breeding of this species. This invention can also be scaled up for use in outdoor cement ponds and factory-style recirculating aquaculture systems for large-scale rewilding training of released fish fry.

[0099] The advantages of this invention are that it is used to domesticate the swimming, feeding and predation evasion abilities of large yellow croaker fry, enhance the ability of artificially bred fry to adapt to the marine natural environment, improve the survival rate of fry, and thus enhance the propagation effect of large yellow croaker after release.

[0100] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A method for training large yellow croaker fry to proliferate, release and wild, characterized in that, The method comprises the following steps: putting the to-be-trained large yellow croaker fry into a water tank; controlling the light intensity and light cycle provided by the light source to the water tank through a controller to simulate the light environment of the marine ecosystem; the controller controls the operation of multiple wave-making pumps located in the water tank to simulate the water flow environment of the marine ecosystem, train the swimming ability of the large yellow croaker fry, the flow rate of the wave-making pump is controlled at 0.2 m / s-0.25 m / s to form a gentle water flow, and the adaptation of the large yellow croaker fry is observed, and the feeding of feed trains the predation ability of the large yellow croaker fry, when the difference between the swimming speed of the large yellow croaker fry in the water tank and the flow rate of the wave-making pump is within ±0.02 m / s, the controller controls the feeding mechanism to feed the enemy pheromone into the water tank to train the ability of the large yellow croaker fry to avoid being preyed upon, the flow rate of the multiple wave-making pumps is increased every 2 hours, the flow rate difference of each adjustment is 0.02 m / s-0.05 m / s, and the flow rate difference of each adjustment is equal, and when the flow rate of the wave-making pump is adjusted to 0.45 m / s, it is recorded as one round of uniform speed training; the behavior characteristic information of the large yellow croaker fry in the above wild training within 10 seconds is captured by a camera, and the behavior characteristic information is sent to the controller, the controller calculates the burst swimming speed of the fry within 10 seconds according to the swimming distance of the fry, when the large yellow croaker fry produces a rapid escape reaction and recovers to uniform speed after a period of time, it is recorded as one round of escape training, and during the domestication, six rounds of escape training are performed every day, and when the swimming distance of the large yellow croaker fry within 1 minute under predation stress is stably at 25-30 m for three times in a row, the training of the ability of the large yellow croaker fry to avoid being preyed upon is ended; the controller comprehensively analyzes the swimming and fish reef use of the large yellow croaker fry in the water tank through the behavior characteristic information of the large yellow croaker in the wild training and the behavior characteristic information of the large yellow croaker in the marine ecosystem through a fish behavior analysis system to analyze and determine the wild training effect; when the flow rate of the wave-making pump is 0.45 m / s, the to-be-trained large yellow croaker fry swims at the top flow for 10 minutes, and the swimming speed variation amplitude is not more than ±0.02 m / s, and at the same time, within 6-10 minutes after the addition of the enemy pheromone, 45%-60% of the large yellow croaker fry activity area is in the fish reef in the water tank, then the training effect meets the standard.

2. The method according to claim 1, wherein the method is characterized by, The training time of the large yellow croaker fry is 4-6 days, one round of uniform speed training is performed per day, and one round of variable speed training is performed every other day, and the swimming ability training of the large yellow croaker fry is alternately completed.

3. The method according to claim 2, wherein the method is characterized by, The feeding of feed trains the predation ability of the large yellow croaker fry, which comprises the following steps: during the uniform speed training or variable speed training, a small amount of brine shrimp is simultaneously fed into the water tank, and a certain amount of pellet feed is supplemented after 1 hour according to the feeding condition; the above feeding mode is repeated for 3-5 days, and the amount of brine shrimp is increased day by day and the amount of pellet feed is reduced day by day; from the 6th day to the 10th day, the brine shrimp completely replaces the pellet feed; after the 10th day, the feeding of brine shrimp is gradually reduced, and shrimp fry is put into the water tank, and the amount of shrimp fry is increased day by day until the shrimp fry completely replaces the brine shrimp.

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