A fish fry circulating water breeding system

Abstract

The invention discloses a fish fry circulating water breeding system, which relates to the technical field of fish fry breeding, comprising a fish pond and a double sewage discharge module. Fish pond water in the fish pond is discharged into a microfiltration device arranged at the output end of the double sewage discharge module through the double sewage discharge module, and is physically filtered to obtain fish pond water with fish feces impurities removed. The fish pond water with fish feces impurities removed enters a pump pool arranged at the output end of the microfiltration device, and the fish pond water with fish feces impurities removed is transported by a pump station arranged on the pump pool and enters a UV sterilization module arranged at the output end of the pump pool to obtain sterilized fish pond water. The sterilized fish pond water is passed into a biological filtration pool arranged at the output end of the UV sterilization module to remove solid suspended matter in the sterilized fish pond water and remove ammonia, nitrogen and nitrite to obtain purified water. The output end of the biological filtration pool is provided with a medium-pressure oxygenation module. The invention can effectively improve the survival rate of fish fry.

Description

Technical Field

[0001] The present invention relates to the technical field of fish fry breeding, and in particular to a fish fry circulating water breeding system. Background Art

[0002] At present, the depth of the aquaculture pond in the circulating water system of traditional indoor aquaculture is usually 1-2 meters, which is prone to residual bait, fish feces and secretions, as well as sticky pollutants in the water. These substances are prone to breeding a large number of bacteria and parasites, which are not conducive to fish growth and need to be cleaned in time to prevent water quality deterioration. Microfiltration devices or fixed screens are generally used to filter solid suspended matter in aquaculture wastewater. In addition, corrugated plates or ceramic particles are also used through biological treatment to decompose organic matter dissolved in the water, and then return it to the aquaculture pond for recycling.

[0003] However, the existing circulating water seedling raising system uses a water pump to extract water from the fish pond and simply filters it, which cannot effectively remove harmful pathogens and harmful impurities in the water, resulting in a greatly reduced survival rate of the fry. Therefore, in order to solve the above technical problems, a fish fry circulating water seedling raising system is proposed. Summary of the Invention

[0004] The present application provides a fish fry circulating water breeding system, which can effectively improve the survival rate of fish fry.

[0005] The present application provides a fish fry circulating water breeding system, which adopts the following technical solutions:

[0006] A fish fry circulating water breeding system comprises a fish pond and a double sewage discharge module. The fish pond water in the fish pond is discharged into a microfiltration device provided at the output end of the double sewage discharge module through the double sewage discharge module, and is physically filtered to obtain fish pond water with fish feces impurities removed. The fish pond water with fish feces impurities removed enters a pump pool provided at the output end of the microfiltration device. The fish pond water with fish feces impurities removed is transported by a pump station provided on the pump pool and enters a UV sterilization module provided at the output end of the pump pool to obtain sterilized fish pond water. The sterilized fish pond water is passed into a biological filtration pool provided at the output end of the UV sterilization module to remove suspended solids and ammonia, nitrogen and nitrite in the sterilized fish pond water to obtain purified water. The output end of the biological filtration pool is provided with a medium-pressure oxygenation module for increasing the dissolved oxygen saturation of the purified water to obtain purified oxygenated water. The output end of the medium-pressure oxygenation module is connected to the fish pond to circulate the purified oxygenated water into the fish pond.

[0007] By adopting the above technical solution, the UV sterilization module can be used to sterilize the fish pond water, reduce the diseases of the fry, and improve the survival rate of the fry. By providing a biological filtration pool for purifying the water source, the fish pond water is purified and circulated into the fish pond to improve the survival rate of the fry.

[0008] Preferably, the UV sterilization module includes an ultraviolet disinfection and sterilization lamp, and the irradiation dose of the ultraviolet disinfection and sterilization lamp is greater than 30mj / ㎡.

[0009] By adopting the above technical solution, sterilized fish pond water can be obtained.

[0010] Preferably, the biological filtration tank includes a fixed biological bed and a mobile biological bed, and the mobile biological bed includes an organic matter removal unit, a biological denitrification unit, a biological denitrification unit and a biological deammonification unit.

[0011] By adopting the above technical solution, ammonia, nitrogen and nitrite in sterilized fish pond water are removed to obtain purified water.

[0012] Preferably, the dual sewage discharge module includes a bottom discharge pipe located at the bottom of the fish pond and a side discharge pipe located at the side of the fish pond. A fish tank that can be raised and lowered and is used to limit the activity space of the fry is provided inside the fish pond. A water flow path is formed between the outer wall of the fish tank and the inner wall of the fish pond. The input end of the side discharge pipe faces the water flow path. When the fish tank rises below the water surface and the outer side wall of the fish tank faces the output end of the side discharge pipe, the fish pond water in the upper layer of the fish tank crosses the top of the fish tank and passes through the water flow path into the side discharge pipe. The lateral obstruction formed by the fish tank at the input end of the side discharge pipe can effectively avoid the fish in the fish tank from sliding into the water flow path. The fry in the upper layer of the fish tank enter the interior of the side discharge pipe. An elastic net is provided at the bottom of the fish tank, and landscape filling stones are provided on the upper side of the elastic net. The input end of the bottom discharge pipe is located in the space below the elastic net. The fish tank moves up and down, causing relative displacement between the landscape filling stone units. This, on the one hand, serves to disturb the fry at the bottom of the fish tank, and on the other hand, promotes fish feces and impurities at the bottom of the fish tank to enter the gaps between the landscape filling stone units. The bottom discharge pipe is used to extract the fish feces and impurities in the gaps. The interference of the elastic net and the separation of the landscape filling stones prevent the fry at the bottom of the fish tank from entering the bottom discharge pipe.

[0013] By adopting the above technical solution, the lateral obstruction formed by the fish farming tube at the input end of the side discharge pipe, the interference of the elastic net and the separation of the landscape filling stones are used to prevent the fry from entering the bottom discharge pipe and the side discharge pipe.

[0014] Preferably, the output end of the bottom drain pipe is connected to the input end of the microfiltration device, the input end of the pump pool is connected to the output end of the side drain pipe, and the side drain pipe is arranged on one side of the fish pond and close to the upper side of the fish pond.

[0015] By adopting the above technical solution, fish feces, food residues and impurities in the water are deposited at the bottom of the fish pond under the action of gravity, and are input into the microfiltration device through the bottom drainage pipe, and the fish pond water in the middle and upper layers of the fish pond is passed into the interior of the pump pool.

[0016] Preferably, a bracket is provided inside the fish farming tube, a binding rope is provided on the bracket, one end of the binding rope is connected to the bracket, and the other end of the binding rope is connected to a winding assembly, the winding assembly includes several groups of driven wheels and a driving motor provided on the fish pond, and the output end of the driving motor is connected to a driving wheel.

[0017] By adopting the above technical solution, the driven wheel is driven by the driving motor to reel in the binding rope, thereby realizing the lifting and lowering of the fish farming tube in the fish pond.

[0018] Preferably, a partition is provided on the lower side of the elastic net, a suction port is provided at the center of the partition, the suction port passes through the partition, and an impeller is provided directly below the suction port.

[0019] By adopting the above technical solution, the water in the area below the partition forms a vortex through the rotation of the impeller, which is used to quickly absorb fish feces and impurities in the gaps of landscape filling stones and enter the lower space of the partition through the suction port.

[0020] Preferably, a Y-shaped tube is provided on the lower side of the partition, and a first inlet, a second inlet and an outlet are provided on the Y-shaped tube. The outlet is connected to the bottom row pipe, and the first inlet is horizontally facing downwards of the partition.

[0021] By adopting the above technical solution, impurities and fish feces deposited on the partition are adsorbed.

[0022] Preferably, a vertical tube that can vibrate up and down is provided at the second inlet of the Y-shaped tube, a debris inlet head is provided at the top of the vertical tube, the debris inlet head is communicated with the vertical tube, a debris inlet port is provided on the side of the debris inlet head, the vertical tube passes through a through hole provided in the partition, and a recessed portion matching the debris inlet head is provided on the upper side of the through hole. When the vertical tube moves downward with the debris inlet head until the debris inlet port on the debris inlet head overlaps with the inner wall of the recessed portion to varying degrees, the entrance of the debris inlet port becomes narrower, the water flow velocity near the debris inlet port increases, and the suction force increases, which is used to quickly absorb impurities and fish feces on the upper surface of the partition.

[0023] By adopting the above technical solution, the vertical pipe vibrates up and down, causing the debris inlet head to move up and down intermittently, so that the arc surface provided on the upper surface of the debris inlet head contacts the lower surface of the elastic net. On the one hand, the vibration of the debris inlet head will drive away the fry located near the elastic net. On the other hand, it will loosen the individual landscaping stone elements, continuously changing the gaps between the landscaping stone elements. The elastic net will be used to screen out impurities and fish feces in the gaps between the landscaping stone elements, and then enter the interior of the bottom discharge pipe through the debris inlet. A corrugated pipe is provided between the vertical pipe and the bottom discharge pipe to adapt to the up and down vibration of the vertical pipe.

[0024] Preferably, an annular plate is provided on the lower side of the partition, the vertical tube is fixed on the annular plate, and an energy-saving driving component is provided at the bottom of the annular plate for driving the annular plate to move up and down and driving the impeller to rotate at the same time.

[0025] By adopting the above technical solution, the annular plate is made to reciprocate up and down under the partition through the energy-saving drive component, which not only saves energy and reduces emissions, but also effectively forms an adsorption area on the lower side of the elastic net, and effectively prevents the fry from entering the bottom row pipe, thereby increasing the survival rate.

[0026] In summary, this application has the following beneficial effects:

[0027] 1. By using circulating water to raise fry, the survival rate of fry is high, with the highest single batch survival rate of 80% and an average of 50-60%. It also has low cost, less labor, low energy consumption, and small footprint. In addition, the amount of water changed in the fish pond is small, only 10-20% is needed, and it can effectively prevent the fry from being adsorbed and killed by high water flow rates during the water circulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the overall structure of the fish fry circulating water breeding system in this embodiment;

[0029] Figure 2 This is a flow chart of the fish fry circulating water breeding system in this embodiment;

[0030] Figure 3 Schematic diagram of the overall structure of the fish pond in this embodiment;

[0031] Figure 4 1 is a cross-sectional view of the overall structure of the fish pond in this embodiment;

[0032] Figure 5 Schematic diagram of the explosion structure between the partition plate and the annular plate in this embodiment;

[0033] Figure 6 Schematic diagram of the overall structure of the energy-saving drive component in this embodiment.

[0034] Explanation of reference numerals: 1. fish pond; 2. double sewage discharge module; 201. bottom discharge pipe; 202. side discharge pipe; 3. microfiltration device; 4. pump tank; 5. pump station; 6. UV sterilization module; 7. biological filtration tank; 701. fixed biological bed; 702. mobile biological bed; 8. medium-pressure oxygenation module; 9. fish tank; 10. elastic net; 11. landscape filling stone; 12. bracket; 13. binding rope; 14. driving wheel; 15. driven wheel; 16. partition ; 17. Suction port; 18. Impeller; 19. Y-shaped pipe; 20. Vertical pipe; 21. Inlet head; 22. Inlet port; 23. Through hole; 24. Recessed portion; 25. Ring plate; 26. Energy-saving drive assembly; 2601. Servo motor; 2602. Special-shaped rod; 2603. Bending portion; 2604. Sleeve; 2605. Connecting rod; 2606. Limiting column; 2607. Movable rod; 2608. Slide groove; 2609. Rotating rod. Implementation Method

[0035] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0036] Embodiment: The present invention discloses a fry circulating water breeding system, such as Figure 1-Figure 2As shown, it includes a fish pond 1 and a double sewage module 2, the double sewage module 2 includes a bottom drainage pipe 201 arranged at the bottom position of the fish pond 1 and a side drainage pipe 202 arranged at the side position of the fish pond 1, the input ends of the bottom drainage pipe 201 and the side drainage pipe 202 are both provided with an interception net, and the interception net is a multi-aperture structure to prevent the fry from entering the bottom drainage pipe 201 and the side drainage pipe 202. The fish pond water in the fish pond 1 is discharged into the microfiltration device 3 arranged at the output end of the double sewage module 2 through the double sewage module 2, the output end of the bottom drainage pipe 201 is connected to the input end of the microfiltration device 3, and the fish feces, food residues and impurities in the water are deposited at the bottom of the fish pond 1 under the action of gravity, and are input into the microfiltration device 3 through the bottom drainage pipe 201, and the fish are removed after physical filtration. The fish pond water without fecal impurities enters the pump pool 4 located at the output end of the microfiltration device 3. The input end of the pump pool 4 is connected to the output end of the side discharge pipe 202. The side discharge pipe 202 is arranged on one side of the fish pond 1 and close to the upper side of the fish pond 1. The fish pond water in the upper and middle layers of the fish pond 1 is passed into the interior of the pump pool 4. The fish pond water without fecal impurities is transported by the pump station 5 located on the pump pool 4 and enters the UV sterilization module 6 located at the output end of the pump pool 4. The UV sterilization module 6 includes an ultraviolet disinfection lamp. The irradiation dose of the ultraviolet disinfection lamp is greater than 30mj / ㎡, which is used to obtain the sterilized fish pond water. The sterilized fish pond water is passed into the biological filtration pool 7 located at the output end of the UV sterilization module 6. Pool 7 includes a fixed biological bed 701 and a mobile biological bed 702. The fixed biological bed 701 includes a filter tank, a water inlet pump, a backwash pump, an induced draft fan, a blower and a water collection tank. A filter plate is provided inside the filter tank. The filter plate divides the inside of the filter tank into a filling area and an empty area from top to bottom. The inside of the filling area is provided with a supporting layer, a gravel layer, a quartz sand layer and an expanded slate layer from top to bottom. A water distributor is provided on the upper side of the supporting layer for removing suspended solids in the sterilized fish pond water. The empty area is connected to the water collection tank through a water pipe for storing the sterilized fish pond water with suspended solids removed. The mobile biological bed 702 includes an organic matter removal unit, a biological denitrification unit, a biological denitrification unit and a biological deammonification unit for removing Purified water is obtained after removing ammonia, nitrogen and nitrite from the sterilized fish pond water. A medium-pressure oxygenation module 8 is provided at the output end of the biological filter tank 7. The new medium-pressure oxygenation has complete power reflux and can reach a dissolved oxygen saturation of 200% without a power source. At the same time, bubbles in the pipeline are removed to increase the dissolved oxygen saturation of the purified water to obtain purified oxygenated water. The output end of the medium-pressure oxygenation module 8 is connected to the fish pond 1 to circulate the purified oxygenated water into the fish pond 1 to form a water cycle. By utilizing the circulating water to raise fish fry, the survival rate of the fish fry is high, the highest single batch survival rate is 80%, and the average can reach 50-60%. In addition, the cost is low, the labor is small, the energy consumption is low, and the floor space is small. In addition, the water change volume of the fish pond 1 is small, only 10-20% is required.

[0037] like Figure 3-Figure 4As shown, the interior of the fish pond 1 is provided with a fish-raising tube 9 which can be raised and lowered and is used to limit the activity space of the fry. A water flow path is formed between the outer wall of the fish-raising tube 9 and the inner wall of the fish pond 1. The input end of the side discharge pipe 202 faces the water flow path. When the fish-raising tube 9 rises below the water surface and the outer wall of the fish-raising tube 9 faces the output end of the side discharge pipe 202, the fish pond water in the upper layer of the fish-raising tube 9 crosses the top of the fish-raising tube 9 and passes through the water flow path into the side discharge pipe 202. The lateral obstruction formed by the fish-raising tube 9 at the input end of the side discharge pipe 202 can effectively prevent the fry located in the upper layer of the fish-raising tube 9 from entering the inside of the side discharge pipe 202, and the fry can be kept away from the fish. An elastic net 10 is provided at the bottom of the fish tank 9, and landscape rocks 11 are provided above the elastic net 10. The input end of the bottom drainage pipe 201 is located in the space below the elastic net 10. The upward and downward movement of the fish tank 9 causes relative displacement between the individual landscape rocks 11. This not only disturbs the fry at the bottom of the fish tank 9, but also encourages fish feces and impurities at the bottom of the fish tank 9 to enter the gaps between the individual landscape rocks 11. The bottom drainage pipe 201 is used to extract the fish feces and impurities in the gaps. The interference of the elastic net 10 and the separation of the landscape rocks 11 prevent the fry at the bottom of the fish tank 9 from entering the bottom drainage pipe 201.

[0038] like Figure 4 As shown, a bracket 12 is provided inside the fish farming tube 9, and a binding rope 13 is provided on the bracket 12. One end of the binding rope 13 is connected to the bracket 12, and the other end of the binding rope 13 is connected to a winding assembly. The winding assembly includes several groups of driven wheels 15 and a driving motor provided on the fish pond 1. The output end of the driving motor is connected to a driving wheel 14, and the binding rope 13 is provided on the driving wheel 14. Several groups of driven wheels 15 are adaptively distributed along the winding direction of the binding rope 13. The adaptive distribution here can be understood as that several groups of driven wheels 15 are provided on the fish pond 1 to avoid friction loss between the binding rope 13 and the fish pond 1. The driving motor is used to rotate the driving wheel 14 and wind up the binding rope 13 to change the free length of the binding rope 13, thereby realizing the lifting and lowering of the fish farming tube 9 in the fish pond 1.

[0039] like Figure 5 and Figure 6As shown, a partition 16 is provided on the lower side of the elastic net 10, and a suction port 17 is provided at the center of the partition 16. The suction port 17 passes through the partition 16, and an impeller 18 is provided just below the suction port 17. The rotation of the impeller 18 forms a vortex in the water below the partition 16, which is used to quickly absorb fish feces and impurities in the gaps of the landscape filling stone 11 and pass through the suction port 17 into the lower space of the partition 16. A Y-shaped tube 19 is provided on the lower side of the partition 16. There are a first inlet, a second inlet and an outlet, the outlet is connected to the bottom discharge pipe 201, the first inlet is horizontally facing the bottom of the partition 16, and is used to absorb impurities and fish feces deposited on the partition 16. The second inlet is provided with a vertical pipe 20 that can vibrate up and down, and a debris inlet head 21 is provided on the top of the vertical pipe 20. The debris inlet head 21 is connected to the vertical pipe 20, and a debris inlet port 22 is provided on the side of the debris inlet head 21. The vertical pipe 20 vibrates up and down, and the debris inlet head 21 moves up and down intermittently, so that the debris inlet head 21 is provided with a small amount of impurities. The arc surface contacts the lower surface of the elastic net 10. On the one hand, the vibration of the inlet head 21 will drive away the fry near the elastic net 10. On the other hand, it will loosen the gaps between the attached landscape filling stones 11, continuously change the gaps between the attached landscape filling stones 11, and use the elastic net 10 to screen out impurities and fish feces in the gaps between the attached landscape filling stones 11, and enter the interior of the bottom discharge pipe 201 through the inlet port 22. A corrugated pipe is provided between the vertical pipe 20 and the bottom discharge pipe 201 to adapt to the impurities and fish feces in the gaps between the attached landscape filling stones 11. The vertical tube 20 vibrates up and down, and passes through the through hole 23 provided in the partition 16. The upper side of the through hole 23 is provided with a recessed portion 24 that matches the debris inlet head 21. When the vertical tube 20 moves downward with the debris inlet head 21 until the debris inlet port 22 on the debris inlet head 21 overlaps with the inner wall of the recessed portion 24 to varying degrees, the entrance of the debris inlet port 22 becomes narrower, the water flow velocity near the debris inlet port 22 increases, and the suction force is increased, which is used to quickly absorb impurities and fish feces on the upper surface of the partition 16.

[0040] like Figure 5-Figure 6 As shown, an annular plate 25 is provided on the lower side of the partition 16, and the vertical pipe 20 is fixed on the annular plate 25. The bottom of the annular plate 25 is provided with an energy-saving drive component 26 for driving the annular plate 25 up and down and driving the impeller 18 to rotate. Figure 6As shown, the energy-saving drive component 26 includes a servo motor 2601, and the output end of the servo motor 2601 is connected to a special-shaped rod 2602, the top of the special-shaped rod 2602 is connected to the bottom of the impeller 18, and the middle part of the special-shaped rod 2602 is provided with a bending portion 2603 in the horizontal direction, and a sleeve 2604 is movably provided on the bending portion 2603, and a connecting rod 2605 is provided on the sleeve 2604. The free end of the connecting rod 2605 is provided with a limiting column 2606, and the limiting column 2606 passes through a movable rod 2607 rotatably arranged at the bottom of the fish pond 1. The interior of the movable rod 2607 is provided with a slide groove 2608, and the limiting column 2606 is movably arranged in the slide groove 2608. The top of the movable rod 2607 is hinged with a rotating rod 2609, and the free end of the rotating rod 2609 is rotatably connected to the bottom of the annular plate 25.

[0041] The servo motor 2601 drives the special-shaped rod 2602 to rotate. On the one hand, it drives the impeller 18 to rotate to form a vortex under the partition 16. On the other hand, it drives the connecting rod 2605 to be displaced in the horizontal direction, so that the movable rod 2607 and the rotating rod 2609 are linked. Through the limiting effect of the vertical tube 20 in the through hole 23, the annular plate 25 is made to reciprocate up and down under the partition 16. This not only saves energy and reduces emissions, but also effectively forms an adsorption area on the lower side of the elastic net 10, and can effectively prevent the fry from entering the bottom row pipe 201, so that the survival rate is high.

[0042] Working principle: When using the fish pond 1 to raise seedlings, first place the seedlings inside the fish farming tube 9, and use the winding rope 13 to move the fish farming tube 9 upward until the outer wall of the fish farming tube 9 blocks the input end of the side discharge pipe 202 to prevent the side discharge pipe 202 from adsorbing the seedlings. Then, the fish pond water in the fish pond 1 is passed into the interior of the microfiltration device 3 through the double sewage discharge module 2 for physical filtration to remove fish feces impurities and discharge them into the pump pool 4. The water removing fish feces impurities is output to the UV sterilization module 6 by the pump station 5. After irradiation by the ultraviolet disinfection lamp, the fish pond water in the fish pond 1 is sterilized. The sterilized fish pond water is passed into the biological filtration pool 7 to remove ammonia, nitrogen and nitrite in the sterilized fish pond water to obtain purified water. Finally, the dissolved oxygen saturation of the purified water is increased through the medium-pressure oxygenation module 8. The overall solution can effectively ensure the survival rate of the seedlings by recycling the fish pond water.

[0043] During the circulation process of the above-mentioned fish pond water, the servo motor 2601 drives the rotation of the special-shaped rod 2602. On the one hand, it drives the impeller 18 to rotate to form a vortex under the partition 16. On the other hand, it causes the vertical pipe 20 to reciprocate up and down, and causes the inlet head 21 to intermittently move up and down, so that the arc surface provided on the upper surface of the inlet head 21 contacts the lower surface of the elastic net 10, which is used to drive away the fry near the elastic net 10. In addition, it loosens the individual units of the attached landscape filling stones 11, continuously changes the gaps between the attached landscape filling stones 11, and uses the elastic net 10 to screen out impurities and fish feces in the gaps of the attached landscape filling stones 11, thereby preventing the fry from entering the bottom discharge pipe 201, which is used to improve the survival rate of the fry.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A fish fry circulating water breeding system, characterized by: The invention comprises a fish pond (1) and a double sewage discharge module (2). The fish pond water in the fish pond (1) is discharged into a microfiltration device (3) provided at the output end of the double sewage discharge module (2) through the double sewage discharge module (2), and is subjected to physical filtration to obtain fish pond water with fish feces impurities removed. The fish pond water with fish feces impurities removed enters a pump pool (4) provided at the output end of the microfiltration device (3), and the fish pond water with fish feces impurities removed is transported by a pump station (5) provided on the pump pool (4) and enters a UV sterilization module (6) provided at the output end of the pump pool (4) for sterilization. Sterilized fish pond water is obtained, and the sterilized fish pond water is introduced into a biological filtration pool (7) provided at the output end of a UV sterilization module (6) for removing suspended solids in the sterilized fish pond water and removing ammonia, nitrogen, and nitrite to obtain purified water. The output end of the biological filtration pool (7) is provided with a medium-pressure aeration module (8) for increasing the dissolved oxygen saturation of the purified water to obtain purified oxygenated water. The output end of the medium-pressure aeration module (8) is connected to the fish pond (1) for circulating the purified oxygenated water into the fish pond (1); The dual sewage module (2) comprises a bottom drainage pipe (201) provided at the bottom of the fish pond (1) and a side drainage pipe (202) provided at the side of the fish pond (1). A fish culture tube (9) which can be raised and lowered and is used to limit the activity space of the fry is provided inside the fish pond (1). A water flow path is formed between the outer wall of the fish culture tube (9) and the inner wall of the fish pond (1). The input end of the side drainage pipe (202) faces the water flow path. When the fish culture tube (9) rises below the water surface and the outer wall of the fish culture tube (9) faces the output end of the side drainage pipe (202), the fish pond water in the upper layer of the fish culture tube (9) crosses the top of the fish culture tube (9) and passes through the water flow path into the side drainage pipe (202). The lateral obstruction formed by the fish culture tube (9) at the input end of the side drainage pipe (202) can effectively avoid the fish culture tube (9) from entering the water flow path. ) The fry at the upper position in the middle enters the interior of the side discharge pipe (202), the bottom of the fish culture tube (9) is provided with an elastic net (10), the upper side of the elastic net (10) is provided with a landscape filling stone (11), the input end of the bottom discharge pipe (201) is located in the lower side space of the elastic net (10), the fish culture tube (9) moves up and down, so that the landscape filling stone (11) monomers are relatively displaced, on the one hand, to interfere with the fry at the bottom of the fish culture tube (9), and on the other hand, to promote the fish feces and impurities at the bottom of the fish culture tube (9) to enter the gaps between the landscape filling stone (11) monomers, and to use the bottom discharge pipe (201) to extract the fish feces and impurities in the gaps, and to prevent the fry at the bottom of the fish culture tube (9) from entering the bottom discharge pipe (201) through the interference of the elastic net (10) and the separation of the landscape filling stone (11); A partition (16) is provided on the lower side of the elastic net (10), a suction port (17) is provided at the center of the partition (16), the suction port (17) passes through the partition (16), and an impeller (18) is provided directly below the suction port (17); A Y-shaped tube (19) is provided on the lower side of the partition (16), and a first inlet, a second inlet and an outlet are provided on the Y-shaped tube (19), the outlet is connected to the bottom row tube (201), and the first inlet is horizontally facing downward of the partition (16); A vertical pipe (20) capable of vibrating up and down is provided at the second inlet of the Y-shaped pipe (19), a debris inlet head (21) is provided at the top of the vertical pipe (20), the debris inlet head (21) is communicated with the vertical pipe (20), a debris inlet opening (22) is provided on the side of the debris inlet head (21), the vertical pipe (20) passes through a through hole (23) provided in the partition (16), and a recessed portion (24) matching the debris inlet head (21) is provided on the upper side of the through hole (23). When the vertical pipe (20) moves downward with the debris inlet head (21), until the debris inlet opening (22) on the debris inlet head (21) overlaps with the inner wall of the recessed portion (24) to varying degrees, the entrance of the debris inlet opening (22) becomes narrower, the water flow velocity near the debris inlet opening (22) increases, and the suction force increases, so as to quickly absorb impurities and fish feces on the upper surface of the partition (16); An annular plate (25) is provided on the lower side of the partition (16), the vertical pipe (20) is fixed on the annular plate (25), and an energy-saving drive component (26) is provided at the bottom of the annular plate (25) for driving the annular plate (25) to move up and down and simultaneously drive the impeller (18) to rotate.

2. The fry circulating water breeding system according to claim 1, characterized in that: The UV sterilization module (6) comprises an ultraviolet disinfection and sterilization lamp, and the irradiation dose of the ultraviolet disinfection and sterilization lamp is greater than 30 mj / m2.

3. The fish fry circulating water breeding system according to claim 1, characterized in that: The biological filtration tank (7) comprises a fixed biological bed (701) and a mobile biological bed (702), and the mobile biological bed (702) comprises an organic matter removal unit, a biological denitrification unit, a biological denitrification unit, and a biological deammonification unit.

4. The fish fry circulating water breeding system according to claim 1, characterized in that: The output end of the bottom discharge pipe (201) is connected to the input end of the microfiltration device (3), and the input end of the pump pool (4) is connected to the output end of the side discharge pipe (202). The side discharge pipe (202) is arranged on one side of the fish pond (1) and close to the upper side of the fish pond (1).

5. The fish fry circulating water breeding system according to claim 1, characterized in that: The fish culture tube (9) is provided with a bracket (12) inside, and a binding rope (13) is provided on the bracket (12). One end of the binding rope (13) is connected to the bracket (12), and the other end of the binding rope (13) is connected to a winding assembly. The winding assembly includes a plurality of groups of driven wheels (15) and a driving motor provided on the fish pond (1), and the output end of the driving motor is connected to a driving wheel (14).

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