A high-density and high-benefit method for circulating water culture of freshwater fish

Abstract

The present application relates to the technical field of aquaculture, and especially relates to a high-density and high-benefit freshwater fish circulating water breeding method, which uses a high-density and high-benefit freshwater fish circulating water breeding pond, the breeding pond comprises a pond body, a water inlet pipe and a sewage suction pipe, etc.; a sewage ditch is formed on the pond body; the water inlet pipe is connected to the front side of the pond body; the sewage suction pipe is arranged on the back side of the pond body, and a plurality of branch pipes are arranged on the sewage suction pipe and located in the sewage ditch; the water inlet pipe and the sewage suction pipe are connected to an external filtering device, and a water pump is arranged on the filtering device. The present application realizes that the impurities at the bottom of the pond body are pushed backward to the sewage ditch by the scraper, and the straight plate part of the scraper blocks and limits the impurities in the process of backward movement of the scraper, so that the impurities are not lifted, the sewage passes through the water filtering port when the impurities are moved backward by the scraper, and thus the problem that the collection effect of the impurities is reduced due to the backward movement of the pond water caused by the scraper is avoided.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, and in particular to a high-density, high-efficiency recirculating aquaculture method for freshwater fish. Background Technology

[0002] When freshwater fish are raised in high-density ponds, a certain amount of fish feed will not be eaten by the fish after it is put into the pond. At the same time, the fish will produce feces. After a period of time, the feed residue and feces will gradually settle at the bottom of the pond. In order to prevent the impurities from accumulating in the pond for a long time and breeding bacteria and viruses, the impurities at the bottom of the pond need to be scraped off.

[0003] When scraping impurities in existing aquaculture ponds, some impurities are stirred up, causing some of the impurities that have settled at the bottom of the pond to redisperse in the water. This reduces the effectiveness of impurity collection. Furthermore, the movement of the scraper disturbs the fish at the bottom of the pond, causing them to swim quickly and stir up impurities at the bottom of the pond.

[0004] When high-density aquaculture is carried out in existing aquaculture ponds, fish need to be harvested frequently. However, due to the depth of the aquaculture ponds, the water in the ponds must be drained before the fish can be harvested. Furthermore, the fish are relatively scattered in the ponds, making it inconvenient for staff to harvest them, resulting in low harvesting efficiency. Summary of the Invention

[0005] To overcome the shortcomings of existing aquaculture ponds where scraping impurities with a scraper stirs up some impurities, disturbing the fish at the bottom of the pond and making them easily agitate and stir up the impurities, thus affecting the collection effect and resulting in low harvesting efficiency, this invention provides a high-density, high-efficiency recirculating aquaculture method for freshwater fish.

[0006] Technical solution: A high-density, high-efficiency recirculating aquaculture system for freshwater fish, characterized by the following steps:

[0007] Step 1: Set up several independent recirculating aquaculture ponds, each containing an independent recirculating water treatment unit and biosafety isolation measures;

[0008] Step 2: Optimize water flow design to promote fish activity, increase the amount of fish raised per unit area, and improve space utilization.

[0009] Step 3: By installing debris collection equipment in the aquaculture pond and ultraviolet disinfection and ozone sterilization equipment in the circulating water treatment unit, the circulating water is disinfected regularly.

[0010] In the circulating water aquaculture pond described in step one of the aquaculture method, the aquaculture pond includes a pond body, a water inlet pipe, and a sewage suction pipe; a sewage drainage ditch is provided on the pond body; the front side of the pond body is connected to the water inlet pipe; the sewage suction pipe penetrates through the rear side of the pond body, and the sewage suction pipe is connected to ultraviolet disinfection and ozone sterilization equipment; a plurality of branch pipes located in the sewage drainage ditch are provided on the sewage suction pipe; the water inlet pipe and the sewage suction pipe are jointly connected to an external filtering device, and a water pump is provided on the filtering device; it further includes a connecting plate, a connecting rod, a connecting block, a scraping plate, an isolation component, and a translation component; the translation component is connected to the pond body; the translation component is connected to the connecting plate, and the translation component is used to drive the connecting plate to move horizontally; two symmetrically arranged connecting rods are fixedly connected to the connecting plate; a connecting block is connected to each connecting rod; a scraping plate for scraping impurities is jointly fixedly connected between the two connecting blocks, and the scraping plate is in contact with the bottom of the pond body; an isolation component for separating fish and impurities is jointly connected between the pond body and the connecting rod.

[0011] More preferably, the isolation component includes an electric rotating roller, an isolation net, a sliding rod, a first fixing rod, a limiting roller, a second fixing rod, and a limiting rod; an electric rotating roller is installed on the rear side of the pond body; an isolation net is wound on the roller body of the electric rotating roller; a sliding rod is jointly connected between the two connecting rods; the other end of the sliding rod is fixedly connected to the isolation net; a first fixing rod is fixedly connected to each connecting block; a limiting roller is jointly fixedly connected between the two connecting blocks; the limiting roller is located above the scraping plate; two symmetrically arranged second fixing rods are connected to the pond body; a limiting rod is jointly fixedly connected to the lower sides of the two second fixing rods; both the limiting roller and the limiting rod are in contact with the isolation net.

[0012] More preferably, it further includes a pulling rope; the pulling rope is slidably connected to the connecting plate; two symmetrically arranged fixing blocks are provided on the upper side of the connecting plate; the sliding rod is slidably connected to the connecting rod.

[0013] More preferably, the cross-sectional shape of the scraping plate is in the shape of a factory character.

[0014] More preferably, a plurality of water filtering ports are provided on the inclined plate of the scraping plate, and a filter screen is provided in each water filtering port.

[0015] More preferably, a baffle is rotatably connected to one side of each water filtering port away from the sewage drainage ditch, and the baffle is located in front of the filter screen.

[0016] More preferably, it further includes a scraping blade; the scraping blade is fixedly connected to the rear side of the limiting rod; a mud scraping groove is provided on the scraping blade, and the isolation net passes through the mud scraping groove.

[0017] More preferably, the connecting block is slidably connected to the corresponding connecting rod, the second fixing rod is detachably connected to the pond body, and the second fixing rod is fixed to the pond body by a bolt; each first fixing rod is detachably connected to the corresponding connecting plate, and the first fixing rod is fixed to the connecting plate by a bolt.

[0018] More preferably, a brush plate is detachably connected to the inner wall of the scraper trough.

[0019] Beneficial effects: The scraper pushes impurities from the bottom of the pool backward into the drainage ditch. As the scraper moves backward, the straight section of the scraper blocks and limits the impurities, preventing them from being stirred up and affecting the scraping effect. When the scraper moves the impurities backward, the sewage passes through the filter inlet and is intercepted by the filter screen inside the filter inlet. The baffle rotates under the push of the water flow, thus avoiding the problem of reduced impurity collection effect caused by the scraper moving the pool water backward.

[0020] As the electric slider moves the scraper backward, the control motor drives the electric roller to rotate, which synchronously rolls up the isolation net. This isolation net separates the scraper, impurities, and freshwater fish, preventing the scraper from contacting the fish during movement and preventing the fish from stirring up the impurities, thus ensuring the scraper's effective collection of impurities.

[0021] When it is necessary to harvest freshwater fish in the pond, the pull rope is manually pulled, which moves the sliding rod and isolation net upward. Then, the electric slider is controlled to move the connecting plate and its parts backward, and the electric roller is controlled to simultaneously roll up the isolation net. As the electric slider gradually moves to the rear of the pond, the isolation net located between the two connecting rods gradually pushes and drives the freshwater fish backward, thus driving them to the rear of the pond. At this point, the freshwater fish can be harvested manually using a net. The freshwater fish are concentrated in a smaller space at the rear of the pond, making it easier for staff to harvest the fish without draining the water, thus ensuring efficient harvesting and achieving high-efficiency aquaculture.

[0022] By manually moving the second fixed rod, limit rod, and scraper upwards, and simultaneously manually moving the first fixed rod, connecting block, scraper, and limit roller upwards, the limit roller and limit rod are released from their restriction on the isolation net. The isolation net is then rolled up by controlling the electric rotating roller, thus lifting the isolation net upwards and consequently the freshwater fish. This facilitates manual harvesting of the freshwater fish. The scraper, scraper, and limit roller clamp and limit the isolation net, preventing it from folding in the left or right direction. This prevents a large gap between the isolation net and the pool body, which would allow freshwater fish to easily pass through the gap and fall below the isolation net. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the high-density, high-efficiency freshwater fish recirculating aquaculture method of the present invention;

[0024] Figure 2 This is a cross-sectional view of the pool body of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the isolation net, sliding rod, and pull rope combination of the present invention;

[0026] Figure 4 This is a diagram showing the state of the isolation net being pulled upwards according to the present invention;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the scraper of the present invention;

[0028] Figure 6 This is a diagram showing the state of the scraper scraping impurities according to the present invention;

[0029] Figure 7 This is a three-dimensional structural diagram of the electric roller of the present invention;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of the scraper of the present invention;

[0031] Figure 9 This is a diagram showing the state of the isolation net used to catch fish according to the present invention.

[0032] The markings in the diagram are as follows: 1-Pool body, 1001-Drainage ditch, 2-Connecting plate, 3001-Fixing block, 3-Connecting rod, 4-Connecting block, 5-Scraper, 5001-Filter outlet, 5002-Baffle, 101-Inlet pipe, 102-Suction pipe, 201-Slide rail, 202-Electric slider, 301-Electric rotating roller, 302-Isolation net, 303-Slide rod, 304-Pull rope, 305-First fixing rod, 306-Limiting roller, 307-Second fixing rod, 308-Limiting rod, 401-Scraper blade, 40101-Sludge scraping trough. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention.

[0034] Example 1

[0035] A high-density, high-efficiency recirculating aquaculture system for freshwater fish, characterized by the following steps:

[0036] Step 1: Set up several independent recirculating aquaculture ponds, each containing an independent recirculating water treatment unit and biosafety isolation measures;

[0037] Step 2: Optimize water flow design to promote fish activity, increase the amount of fish raised per unit area, and improve space utilization.

[0038] Step 3: By installing debris collection equipment in the aquaculture pond and ultraviolet disinfection and ozone sterilization equipment in the circulating water treatment unit, the circulating water is disinfected regularly.

[0039] A high-density, high-efficiency recirculating aquaculture system for freshwater fish, such as... Figures 1-9 As shown, the recirculating aquaculture pond described in step one of the aquaculture method includes a pond body 1, an inlet pipe 101, and a suction pipe 102; a drainage ditch 1001 is provided on the rear side of the pond body 1; the inlet pipe 101 is connected to the front side of the pond body 1; the suction pipe 102 is provided through the rear side of the pond body 1 and is connected to ultraviolet disinfection and ozone sterilization equipment; several branch pipes located in the drainage ditch 1001 are provided on the suction pipe 102; the inlet pipe 101 and the suction pipe 102 are connected to an external filtration device, and a water pump is provided on the filtration device;

[0040] It also includes a connecting plate 2, a connecting rod 3, a connecting block 4, a scraper 5, an isolation component, and a translation component; the translation component is connected to the pool body 1; the connecting plate 2 is connected to the translation component; two connecting rods 3 are fixedly connected to the lower side of the connecting plate 2, which are arranged symmetrically on the left and right; a connecting block 4 is connected to each connecting rod 3; a scraper 5 is fixedly connected between the two connecting blocks 4, and the scraper 5 is in contact with the bottom of the pool body 1; an isolation component is connected between the pool body 1 and the connecting rods 3.

[0041] The isolation assembly includes an electric rotating roller 301, an isolation net 302, a sliding rod 303, a first fixed rod 305, a limiting roller 306, a second fixed rod 307, and a limiting rod 308. An electric rotating roller 301 is installed on the rear side of the pool body 1, with a motor connected to one end. The isolation net 302 is wound onto the roller body of the electric rotating roller 301. A sliding rod 303 is connected between two connecting rods 3. The other end of the sliding rod 303 is fixedly connected to the isolation net 302. A first fixed rod 305 is fixedly connected to each connecting block 4. A limiting roller 306 is fixedly connected between two connecting blocks 4. The limiting roller 306 is located above the scraper 5. Two second fixed rods 307 are connected to the pool body 1, arranged symmetrically on the left and right sides. A limiting rod 308 is fixedly connected to the lower side of the two second fixed rods 307. Both the limiting roller 306 and the limiting rod 308 are in contact with the isolation net 302.

[0042] It also includes a pull rope 304; the pull rope 304 is slidably connected to the connecting plate 2; two fixing blocks 3001 are provided on the upper side of the connecting plate 2 in a left-right symmetrical arrangement; the slide rod 303 is slidably connected to the connecting rod 3.

[0043] The translation component includes a slide rail 201 and an electric slider 202; two slide rails 201 arranged symmetrically on the left and right are bolted to the pool body 1; an electric slider 202 is slidably connected to each slide rail 201; the two electric sliders 202 are fixedly connected to the connecting plate 2.

[0044] The cross-sectional shape of the scraping plate 5 is in the shape of a factory character.

[0045] A number of water filtering ports 5001 are provided on the inclined plate of the scraping plate 5, and a filter screen is arranged in each water filtering port 5001.

[0046] One baffle 5002 is rotatably connected to each side of each water filtering port 5001 away from the sewage drain 1001, and the baffle 5002 is located in front of the filter screen.

[0047] The water in the pool body 1 is pumped into the filtering device through the sewage suction pipe 102, and after being filtered, it flows back into the pool body 1 through the water inlet pipe 101 to perform cyclic filtration on the water in the pool body 1; the impurities at the bottom of the pool body 1 are scraped by the scraping plate 5, and the isolation net 302 is synchronously wound up by the electric roller 301, so as to separate the scraping plate 5, the impurities and the freshwater fish through the isolation net 302; the isolation net 302 is pulled upward by the pulling rope 304, and the freshwater fish in the pool body 1 are gradually pushed backward by the isolation net 302 to gather the freshwater fish in a smaller space at the rear side of the pool body 1, so that it is effectively convenient for the staff to perform the salvage operation on the freshwater fish.

[0048] As Figure 1 shown, with the side where the water inlet pipe 101 is located as the front side, when breeding high-density freshwater fish in the pool body 1, the filtering device is started, and the water in the pool body 1 is pumped into the filtering device through the sewage suction pipe 102, and after being filtered, it flows back into the pool body 1 through the water inlet pipe 101, so as to realize the cyclic filtration of the water in the pool body 1, effectively guarantee the quality of the water in the pool body 1, so as to realize high-density breeding. After breeding freshwater fish for a period of time, impurities such as feed residues and feces will gradually settle at the bottom of the pool body 1. Since these impurities have a certain weight and viscosity, it is difficult for them to move along with the water flow into the sewage drain 1001 and be sucked away by the sewage suction pipe 102. Therefore, the impurities at the bottom of the pool body 1 need to be scraped to ensure the quality of the water in the pool body 1. By controlling the electric slider 202 to drive the connecting plate 2, the connecting rod 3, the connecting block 4 and the scraping plate 5 to slide on the slide rail 201, the scraping plate 5 is moved from the front side of the pool body 1 to the rear side of the pool body 1, so that the impurities at the bottom of the pool body 1 are gradually pushed backward into the sewage drain 1001 by the scraping plate 5. During this process, by controlling the filtering device, the impurities in the sewage drain 1001 are gradually sucked into the filtering device through the sewage suction pipe 102, so as to complete the operation of cleaning the impurities and avoid the long-term accumulation of impurities in the pool body 1 and the breeding of bacteria and viruses.

[0049] During the scraping process of scraper 5 against impurities at the bottom of pool 1, due to the presence of numerous freshwater fish in pool 1, in existing equipment, scraper 5 is prone to contact with these fish during movement, potentially causing injury. Furthermore, some fish, startled by scraper 5, may stir up impurities at the bottom of pool 1, reducing the scraper 5's effectiveness in collecting impurities. In this invention, initially, scraper 5 and its components are positioned at the foremost side of pool 1. Limited by limiting roller 306 and limiting rod 308, the isolation net 302 is positioned at the bottom of pool 1, and the isolation net 302... There is a certain gap between the 2 and the inner bottom surface of the pond body 1. During the freshwater fish farming process, impurities gradually pass through the isolation net 302 and accumulate on the inner bottom surface of the pond body 1. Then, as the electric slider 202 drives the scraper 5 to move backward, the motor drives the electric roller 301 to rotate. The electric roller 301 synchronously rolls up the isolation net 302, thereby separating the scraper 5, impurities, and freshwater fish through the isolation net 302. This prevents the scraper 5 from contacting the freshwater fish during movement and prevents the freshwater fish from stirring up the impurities, ensuring the collection effect of the scraper 5 on impurities. It should be noted that when the scraper 5 is scraping mud, if... Figure 3 As shown, the slide bar 303 is located at the bottom of the connecting rod 3 to prevent the isolation net 302 from pushing the freshwater fish.

[0050] When scraper 5 moves the impurities settled at the bottom of tank 1 backward, the straight plate of scraper 5 can block and limit the impurities, preventing them from being stirred up and affecting the scraping effect of scraper 5. At the same time, when scraper 5 moves the impurities backward, it also moves the tank water backward, causing the tank water to flush out some of the impurities accumulated behind the inclined plate of scraper 5, thus reducing the impurity collection effect. Therefore, a filter port 5001 is set on the inclined plate of scraper 5. When scraper 5 moves the impurities backward, the sewage passes through the filter port 5001, and the impurities are intercepted by the filter screen inside the filter port 5001. Figure 6 As shown, the baffle 5002 rotates under the push of the water flow, thereby avoiding the problem of reduced impurity collection effect caused by the scraper 5 moving the pool water backward.

[0051] When the scraper 5 moves to the drainage ditch 1001, the electric slider 202 is controlled to move the scraper 5 forward to reset. Under the reaction force of the water, the scraper 5 is pushed to stick tightly to the filter screen in the filter port 5001. As the scraper 5 moves forward, it pushes the pool water and the impurities that have not been scraped off at the bottom of the pool body 1. The remaining impurities move upward along the inclined surface of the scraper 5 with the pool water, thus preventing the scraper 5 from pushing the remaining impurities to the front of the pool body 1 when it resets forward.

[0052] When it is necessary to catch freshwater fish in pond 1, such as Figure 4As shown, by manually pulling the rope 304, the sliding rod 303 and the isolation net 302 move upward. Then, the rope 304 is tied to the fixing block 3001 to prevent the sliding rod 303 from sliding downward. Then, the electric slider 202 is controlled to move the connecting plate 2 and its parts backward, and the electric roller 301 is controlled to simultaneously roll up the isolation net 302. As the electric slider 202 gradually moves to the rear of the pool 1, the freshwater fish in the pool 1 are gradually pushed and driven backward through the isolation net 302 located between the two connecting rods 3. This drives the freshwater fish to the rear of the pool 1, where they can be manually caught with a net. At this time, the freshwater fish are gathered in a small space at the rear of the pool 1, which makes it easy for staff to catch the fish without draining the water, thus ensuring the efficiency of catching the freshwater fish and achieving high-efficiency aquaculture.

[0053] It should be noted that each time freshwater fish need to be caught, the electric slider 202 can be controlled to drive the connecting rod 3 and its parts to a certain position in the pool body 1 according to the required catch amount. Then, the pull rope 304 can be manually pulled to lift the sliding rod 303 and the isolation net 302 upwards. Then, the electric slider 202 can be controlled to drive the isolation net 302 backwards to drive the freshwater fish behind the connecting rod 3, so as to control the catch amount more precisely.

[0054] Example 2

[0055] Based on Example 1, such as Figures 3-9 As shown, it also includes a scraper 401; the scraper 401 is fixedly connected to the rear side of the limiting rod 308; a mud scraping groove 40101 is opened on the scraper 401, and the isolation net 302 passes through the mud scraping groove 40101.

[0056] The connecting block 4 is slidably connected to the corresponding connecting rod 3. The second fixing rod 307 is detachably connected to the pool body 1 and is fixed to the pool body 1 by a pin. Each first fixing rod 305 is detachably connected to the corresponding connecting plate 2 and is fixed to the connecting plate 2 by a pin.

[0057] The inner wall of the scraper trough 40101 is detachably connected to a brush plate.

[0058] Since some impurities adhere to the isolation net 302, during the process of the electric roller 301 winding up the isolation net 302, the isolation net 302, under the limitation of the limiting rod 308 and the limiting roller 306, continuously moves horizontally within the scraping groove 40101 of the scraper blade 401. The inner wall of the scraping groove 40101 scrapes the isolation net 302, thereby removing the impurities adhering to the surface of the isolation net 302. The brush plate in the scraping groove 40101 further enhances the cleaning effect on the isolation net 302.

[0059] Because pool 1 has a certain depth, it is difficult for staff to retrieve freshwater fish located at the bottom of pool 1. Furthermore, due to the limitations imposed by the limiting roller 306 and limiting rod 308, the electric rotating roller 301 cannot retract the isolation net 302 to lift it upwards. Therefore, when driving the freshwater fish to the rear of pool 1 through the isolation net 302, the pin on the second fixing rod 307 is manually removed to detach it from pool 1. The pin on the first fixing rod 305 is then removed to detach it from the connecting plate 2. The second fixing rod 307 is then manually moved upwards, which in turn moves the limiting rod 308 and scraper 401 upwards. Simultaneously, the first fixing rod 305 is manually moved upwards, which in turn moves the connecting block 4, scraper 5, and... The limiting roller 306 moves upward, thereby releasing the limiting roller 306 and the limiting rod 308 from restricting the isolation net 302. By controlling the electric rotating roller 301, the isolation net 302 is rolled up, thereby lifting the isolation net 302 upward and lifting the freshwater fish upward, which effectively facilitates the manual harvesting of freshwater fish. The scraper 401, scraper 5 and limiting roller 306 work together to support the isolation net 302, reducing the difficulty of the electric rotating roller 301 to roll up. The scraper 401, scraper 5 and limiting roller 306 clamp and limit the isolation net 302 to prevent the isolation net 302 from folding in the left and right directions, which would result in a large gap between the isolation net 302 and the pool body 1, making it easy for freshwater fish to pass through the gap between the isolation net 302 and the pool body 1 and fall below the isolation net 302.

[0060] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A high-density, high-efficiency recirculating aquaculture system for freshwater fish, characterized by: It includes the following steps: Step 1: By setting a number of independent recirculating aquaculture ponds, each pond contains an independent circulating water treatment unit and biosecurity isolation measures; Step 2: By optimizing the water flow design to promote fish activities, increasing the aquaculture quantity per unit area, and improving space utilization; Step 3: By setting debris collection equipment in the aquaculture pond and ultraviolet disinfection and ozone sterilization equipment in the circulating water treatment unit, regularly disinfecting the circulating water; The aquaculture pond includes a pond body (1), a water inlet pipe (101) and a sewage suction pipe (102); a sewage drain (1001) is opened on the pond body (1); the front side of the pond body (1) is connected to the water inlet pipe (101); the rear side of the pond body (1) is penetrated by the sewage suction pipe (102), and the sewage suction pipe (102) is connected to the ultraviolet disinfection and ozone sterilization equipment; a number of branch pipes located in the sewage drain (1001) are provided on the sewage suction pipe (102); the water inlet pipe (101) and the sewage suction pipe (102) are jointly connected to an external filtration device, and a water pump is provided on the filtration device; the feature is that it further includes a connecting plate (2), a connecting rod (3), a connecting block (4), a scraper (5), an isolation component and a translation component; the translation component is connected to the pond body (1); the translation component is connected to the connecting plate (2), and the translation component is used to drive the connecting plate (2) to move horizontally; two symmetrically arranged connecting rods (3) are fixedly connected to the connecting plate (2); each connecting rod (3) is connected to a connecting block (4); a scraper (5) for scraping impurities is jointly fixedly connected between the two connecting blocks (4), and the scraper (5) is in contact with the bottom of the pond body (1); an isolation component for separating fish and impurities is jointly connected between the pond body (1) and the connecting rod (3); The isolation component includes an electric rotating roller (301), an isolation net (302), a sliding rod (303), a first fixing rod (305), a limiting roller (306), a second fixing rod (307) and a limiting rod (308); the electric rotating roller (301) is installed on the rear side of the pond body (1); the isolation net (302) is wound on the roller body of the electric rotating roller (301); a sliding rod (303) is jointly connected between the two connecting rods (3); the sliding rod (303) is fixedly connected to the other end of the isolation net (302); a first fixing rod (305) is fixedly connected to each connecting block (4); a limiting roller (306) is jointly fixedly connected between the two connecting blocks (4); the limiting roller (306) is located above the scraper (5); two symmetrically arranged second fixing rods (307) are connected to the pond body (1); a limiting rod (308) is jointly fixedly connected to the lower sides of the two second fixing rods (307); both the limiting roller (306) and the limiting rod (308) are in contact with the isolation net (302).

2. The high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 1, characterized in that, It further includes a pull rope (304); the pull rope (304) is slidably connected to the connecting plate (2); two symmetrically arranged fixing blocks (3001) are provided on the upper side of the connecting plate (2); the sliding rod (303) is slidably connected to the connecting rod (3).

3. A high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 2, characterized in that, The cross-sectional shape of the scraper (5) is in the shape of a factory character.

4. A high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 3, characterized in that, The scraper (5) has several filter ports (5001) on its inclined plate, and each filter port (5001) is equipped with a filter screen.

5. A high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 4, characterized in that, Each filter outlet (5001) is rotatably connected to a baffle (5002) on the side away from the drain (1001), and the baffle (5002) is located in front of the filter screen.

6. A high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 1, characterized in that, It also includes a scraper (401); the scraper (401) is fixed to the rear side of the limiting rod (308); a mud scraping groove (40101) is opened on the scraper (401), and the isolation net (302) passes through the mud scraping groove (40101).

7. A high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 1, characterized in that, The connecting block (4) and the corresponding connecting rod (3) are slidably connected. The second fixing rod (307) is detachably connected to the pool body (1). The second fixing rod (307) is fixed to the pool body (1) by a pin. Each first fixing rod (305) is detachably connected to the corresponding connecting plate (2). The first fixing rod (305) is fixed to the connecting plate (2) by a pin.

8. A high-density, high-efficiency recirculating aquaculture system for freshwater fish according to claim 7, characterized in that, The inner wall of the scraper trough (40101) is detachably connected to a brush plate.

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