CN212306533U - Perch recirculating aquaculture device - Google Patents

Abstract

The utility model discloses a perch recirculating aquaculture device belongs to ecological aquaculture technical field. The cultivation pond is characterized by comprising at least one cultivation pond located at the edge of a rice field, wherein a circular ditch is formed in the periphery of the rice field, and the cultivation pond is fixedly installed between the rice field and the circular ditch. Breed the pond including breeding the district and collecting dirty district, breed the district and collect fixedly connected with separation net between the dirty district, collect dirty district and keep away from one side fixedly connected with blow off pipe of breeding the district, the one end fixed connection that the dirty district of collection was kept away from to the blow off pipe is in the ring ditch bottom, fixedly connected with oxygenation subassembly and inlet tube in the breed district, fixedly connected with suction pump on the inlet tube. The utility model discloses a breeding device utilizes and breeds the perch in the water of breeding circulation between pond, circular drain and paddy field, is favorable to improving the quality of water of breeding the perch water, ensures that rice and perch mutually help each other and mutually benefit under the prerequisite that does not hinder each other, promotes the rice growth, improves the survival rate of perch.

Description

Perch recirculating aquaculture device

Technical Field

The utility model relates to a perch recirculating aquaculture device belongs to ecological aquaculture technical field.

Background

The weever is one of common economic fishes, has white, fat and tender meat, less fine bones, no fishy smell, extremely delicious taste and rich nutrition, grows and breeds in fresh water, is favored to inhabit the bottom layer of clear running water, and can adopt a paddy field breeding mode for breeding the weever. The fish culture in the rice field is an ecological culture mode for freshwater fish culture, and fish products can be harvested while rice is planted by culturing fish in the rice field, so that the planting and culture land is saved. The excrement of the fish can be used as the fertilizer of the rice, the fish cultured in the rice field can eat pests and weeds in the rice field, soil is turned over to promote the decomposition of the fertilizer, so that the rice is utilized to purify the water body, the condition that the water body quality is reduced due to high culture density is avoided, the operation of applying a large amount of chemical fertilizer to the rice is also omitted, and the protection of the surrounding ecological environment is favorably improved.

In the prior art, the patent application with the publication number of CN205794314U discloses an ecological efficient rice and fish mixed culture symbiotic facility, which comprises rice field units for planting rice, wherein a plurality of longitudinally arranged rice field units form rice field unit columns, a plurality of rice field unit columns form rice planting areas, fish ditches for supplying and draining water are arranged among the rice field units, ridges are arranged at the edges of the rice fields, culverts are fixedly connected with the two ends of each fish ditch, culture channels for feeding fishes with the use amount are arranged among the rice field unit columns and around the rice planting areas, and escape-preventing walls for preventing the cultured fishes from escaping are fixed around the culture channels. In the culture process, cultured fishes can move in the culture channel, the fish ditch and the paddy field unit, the moving space of the fishes is determined by the height of the water level, and the culture mode of mixed culture and symbiosis of rice and fish is realized. However, when fish live in the cultivation ditch, the fish ditch and the paddy field unit, once the management is not proper, the conditions that the fish eat rice seedlings, rice roots consume a large amount of oxygen in water and the like easily occur, and the growth of rice and the cultivation of the fish are influenced. Meanwhile, the purification of the water quality by the rice is a process of absorbing organic matters in the water by the rice, the amount of fish manure in the water is increased along with the prolonging of the culture time, and the change of the water quality also causes certain influence on the culture of fishes, particularly weever and other fishes with higher requirements on the culture water quality.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a perch recirculating aquaculture device.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a perch recirculating aquaculture device, includes at least one breed pond that is located the paddy field border, the circular ditch has been seted up to the paddy field periphery, breed pond fixed mounting between paddy field and circular ditch. Breed the pond including breeding the district and collecting dirty district, breed the district and collect fixedly connected with separation net between the dirty district, collect dirty district and keep away from one side fixedly connected with blow off pipe of breeding the district, the one end fixed connection that the dirty district of collection was kept away from to the blow off pipe is in the ring ditch bottom, fixedly connected with oxygenation subassembly and inlet tube in the breed district, the one end that the pond was bred in the inlet tube was kept away from is located the ring ditch, fixedly connected with suction pump on the inlet tube.

Through set up between paddy field and ring ditch and breed the pond, breed the breed district in the pond and be used for breeding fish, the dirty district of collection is used for collecting residue excrement and urine, breed the separation net between district and the dirty district of collection and can prevent that the fish from diving to the dirty district of collection, be favorable to reducing the water stirring in the dirty district of collection, promote residue excrement and urine to deposit in the dirty district bottom of collection, the pond wall in the dirty district of collection can adopt back taper pond wall, make residue excrement and urine gather near the blow off pipe in dirty district bottom central authorities of collection, so that discharge it. In the breeding process, a clean water source in the circular ditch is pumped into the breeding pond by utilizing the water inlet pipe and the water suction pump, the oxygen increasing component is used for increasing oxygen in the breeding pond, the oxygen increasing component can be composed of a fan, an air inlet pipe and an exhaust valve, dirt such as residue and excrement in the breeding pond is discharged into the bottom of the circular ditch along a blow-off pipe, and is absorbed by rice as fertilizer after being decomposed, so that the purification of the rice to the water body is realized, and a water circulation system of the water body between the breeding pond and the rice field is formed. Therefore, the water quality of the weever culture water is improved, the damage of the weever to the growth of rice is avoided, the oxygen increasing assembly in the culture pond can ensure the dissolved oxygen amount of the water body in the culture pond, and the survival rate of the weever is favorably improved.

Furthermore, the culture pond is surrounded by glass fiber reinforced plastics, the culture pond is fixedly arranged on the corners of the rectangular rice field, and the upper edge of the culture pond is higher than the rice field. The glass fiber reinforced plastic has stronger tolerance, compressive resistance and heat-proof quality, can not crack in cold and severe weather, also has the heat preservation effect to the pond water in breeding the pond, and easily dismouting, washing and disinfection, conveniently sets up water inlet, drain and overflow mouth at top or bottom. Set up a plurality of ponds of breeding respectively on four angles in paddy field, the figure of breeding the pond can be four, eight or more, breeds the dirty district of collection and breeds the partly of district and bury underground subaerially, and the top of breeding the pond then is higher than ground, makes the surface of water in breeding the pond highly be higher than the annular ditch, conveniently carries out the blowdown under level pressure difference.

Furthermore, the one end fixedly connected with ball assembly that the inlet tube is located the ring ditch, ball assembly keeps the mouth of pipe of inlet tube near the surface of water and be less than the surface of water. The pipe orifice of the water inlet pipe is kept at a height close to the water surface and lower than the water surface, namely water on the inner surface layer of the annular trench is extracted, so that the stability of water inflow can be ensured, and the water quality of the water inflow can be improved.

Further, the floating ball component comprises a floating ball part and a fixing part, the floating ball part is fixedly connected with the water inlet pipe, and the floating ball part and the water inlet pipe are connected to the fixing part in a sliding mode. The water inlet pipe is fixed below the floating ball piece, and the water inlet pipe and the floating ball piece slide up and down along the fixing piece along with the lifting of the water level, so that the stability of the water inlet pipe floating up and down in water is improved, and the situation that the pipe orifice of the water inlet pipe is higher than the water surface under the buoyancy action of the floating ball piece is avoided.

Furthermore, the blow off pipe is located the one end fixedly connected with of ring ditch bottom and prevents stifled subassembly, prevent fixedly connected with valve on the body between stifled subassembly and the dirty district of collection. Prevent stifled subassembly and be used for preventing to breed the mouth of pipe department at the blow off pipe that the discharged filth in the pond blocks up, utilizes valve control to breed the interior periodic blowdown of pond, is favorable to reducing the hydrologic cycle volume under the prerequisite of guaranteeing to breed quality of water in the pond, reduces the energy consumption.

Further, prevent stifled subassembly include with blow off pipe inner wall sliding connection's inner tube, the inner tube stretches out or the blow off pipe of withdrawal along the extending direction of blow off pipe, a plurality of drain have been seted up along circumference on the inner tube lateral wall, the axial extension of inner tube is followed to the drain, the inner tube has the apron of closed inner tube towards the tip swing joint in the blow off pipe outside.

When the sewage is discharged, a valve on the sewage discharge pipe is opened, the water in the culture pond flushes the residue excrement at the bottom of the sewage collection area into the sewage discharge pipe, the inner cylinder at the tail end of the sewage discharge pipe slides out of the pipe opening of the sewage discharge pipe under the water pressure, and the sewage with the residue excrement leaves the inner cylinder from the sewage discharge opening and enters the annular ditch. After the blowdown was accomplished, closed the valve on the blow off pipe, opened the apron of inner tube tip, then in pushing back the blow off pipe with the inner tube, remaining filth in the inner tube got into the annular ditch from the inner tube tip, put back the inner tube tip with the apron again, be favorable to reducing the discharged filth like this and pile up, block up the mouth of pipe in the mouth of pipe department of blow off pipe, influence follow-up blowdown, also be favorable to reducing the interior long-pending filth of depositing of inner tube. The movable connection between the inner cylinder and the cover plate can be realized through threaded connection or buckle connection.

Furthermore, the two sides of the extension direction of the sewage discharge pipe are rotatably connected with a sewage discharge impeller, and the sewage discharge impeller corresponds to the position of a sewage discharge outlet of the inner cylinder extending out of the sewage discharge pipe. In the process of blowdown, the faecal sewage of residue washes out from the drain, drives the blowdown impeller relative with the drain position and rotates, stirs the rivers, and the sewage area with the exhaust is to far away, is favorable to further reducing the siltation of filth near the blow off pipe mouth of pipe.

Furthermore, the sewage discharge impeller on each side of the sewage discharge pipe is provided with two sewage discharge impellers along the extending direction of the sewage discharge outlet, and the distance between the axes of the two sewage discharge impellers is greater than the length of the sewage discharge outlet. The middle of the sewage draining outlet is opposite to that of the two sewage draining impellers, so that the flushed water flows through the two sewage draining impellers, the two sewage draining impellers are driven to rotate in opposite directions, the stirring of the water flow is promoted, and the accumulation of sewage near the pipe orifice of the sewage draining pipe is reduced.

Furthermore, a driving piece for driving the sewage impeller to rotate is connected to the sewage impeller, and the rotation directions of the two sewage impellers positioned on the same side of the sewage pipe are opposite. The sewage discharge impeller is driven by the driving part to rotate, the driving part can be a waterproof motor or a motor arranged in a closed container, the motor drives the sewage discharge impeller to rotate, and the two sewage discharge impellers on the same side can be driven by the driving part to rotate through the mutually meshed gears, namely, the two sewage discharge impellers on one side of the sewage discharge pipe are driven by the driving part.

Furthermore, two sewage discharge impellers positioned on the same side of the sewage discharge pipe are staggered in the horizontal direction, and the two sewage discharge impellers are staggered up and down, so that the probability that the two sewage discharge impellers are blocked and blocked due to the fact that sewage is clamped between the two sewage discharge impellers is favorably reduced.

The utility model has the advantages that:

1) through set up the breed pond between paddy field and ring ditch, utilize the inlet tube, facility such as suction pump and blow off pipe realize the circulation of water between breed pond and paddy field, the water suction after purifying the paddy field is bred in the pond, the residue excrement and urine that store up in breeding the pond then discharges into the ring ditch through the blow off pipe, provide the nutrient for the paddy field after the decomposition, ensure that rice and perch are mutually helped mutually under the prerequisite that does not hinder each other, be favorable to promoting the rice growth, improve the survival rate of perch, realize the breed of higher density.

2) The culture pond is divided into a culture area and a sewage collecting area, the two areas are divided by the isolation net, the weever is cultured in the culture area, the water stirring of the weever to the sewage collecting area is favorably reduced, and the sediment of residue excrement in the sewage collecting area is promoted. When the blowdown, the rivers of blow off pipe and dirty district junction of collection can form the swirl, and the dirt that will collect dirt district accumulational residue excrement and urine is whole to be discharged along the blow off pipe, and the filth that reduces the dirty district of collection is remained.

3) The floating ball assembly is arranged at the end part of the water inlet pipe, so that the pipe orifice of the water inlet pipe is kept at a position close to the water surface and lower than the water surface, and the water pumped into the culture pond is an upper clear water body in the circular ditch, thereby being beneficial to improving the water quality for culture of the weever. Meanwhile, the anti-blocking component of the sewage discharge pipe is utilized to disperse the discharged sewage at the bottom of the circular trench, so that the phenomenon that the discharged solid sewage is accumulated near the pipe orifice to block the pipe orifice is reduced, and the stability of the water body circulating device is improved.

Drawings

Fig. 1 is a schematic diagram of the position distribution in the rice field of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic view of the position relationship between the inner cylinder and the sewage impeller in the sewage discharge state of the utility model.

In the figure, 1, rice field; 2. a culture pond; 21. a breeding area; 22. a sewage collecting area; 23. an isolation net; 3. a ring groove; 4. a blow-off pipe; 41. a valve; 42. an inner barrel; 421. a sewage draining outlet; 422. a cover plate; 43. a sewage discharging impeller; 44. a drive member; 5. an oxygenation assembly; 6. a water inlet pipe; 61. a float ball member; 62. a fixing member; 7. a water pump.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the utility model provides a technical solution: the utility model provides a perch recirculating aquaculture device, is four including breeding pond 2, and 2 figure in the breed pond of this embodiment set up respectively on four angles of paddy field 1, dig the circular ditch 3 that is equipped with retaining in the periphery of paddy field 1, breed pond 2 and lie in paddy field 1 and circular ditch between 3, conveniently breed pond 2 from 3 water intaking and blowdown of circular ditch. The culture pond 2 of this embodiment is enclosed by glass steel, and the culture pond 2 includes culture area 21 and dirt collecting area 22, and culture area 21 is the cylindrical region that is enclosed by annular glass steel, and dirt collecting area 22 is the back taper region that is enclosed by back taper glass steel, and dirt collecting area 22 is located the below of culture area 21, and fixedly connected with separation net 23 between culture area 21 and dirt collecting area 22, the home range of the fish in the culture pond 2 is injectd in culture area 21. Breed still to connect on the pond 2 and install blow off pipe 4, oxygenation subassembly 5 and inlet tube 6, the one end that breed pond 2 was kept away from to blow off pipe 4 and inlet tube 6 all is connected in the annular ditch 3, forms the hydrologic cycle system of intaking, blowdown jointly with paddy field 1, annular ditch 3. The terrain of the circular ditch 3 is lower than that of the rice field 1, the upper edge of the wall of the culture pond 2 is higher than that of the rice field 1, and when water enters, water on the surface layer of the circular ditch 3 is pumped into the culture pond 2 by using a water pump 7 on a water inlet pipe 6; when in pollution discharge, the water level difference between the culture pond 2 and the circular ditch 3 is utilized to discharge the water with the residue and the excrement into the bottom of the circular ditch 3.

As shown in fig. 2, the oxygen increasing assembly 5 adopted in this embodiment includes a blower, an air inlet pipe, an air inlet coil and an evacuation valve fixed on the air inlet pipe, the air inlet coil is placed in the cultivation area 21, and the air inlet pipe, the evacuation valve and the blower are fixed outside the cultivation pond 2. When the oxygen is added into the culture pond 2, the emptying valve is opened firstly, then the fan is started, after the air inlet coil pipe begins to emit air, the emptying valve is closed, and the dissolved oxygen amount of water in the culture area 21 is kept to be more than 6 mg/L. Meanwhile, in order to ensure the quality of water entering the culture pond 2, one end of the water inlet pipe 6 positioned in the annular ditch 3 is fixedly connected with a floating ball component for keeping the pipe orifice of the water inlet pipe 6 at a height close to the water surface. The floater subassembly that this embodiment adopted includes floater 61 and mounting 62, and floater 61 is the floater that has great buoyancy, can float on the surface of water for having, floater 61 and inlet tube 6 fixed connection, and floater 61 and inlet tube 6 sliding connection are on mounting 62, and inlet tube 6 is located the below of floater 61. Thus, the floating ball piece 61 rises or falls along the fixing piece 62 along with the rise or fall of the water level in the annular ditch 3, and the water inlet pipe 6 also rises or falls along with the floating ball piece 61, so that the pipe orifice of the water inlet pipe 6 is maintained at the height which is close to the water surface below the water surface, and the improvement of the quality of inlet water is facilitated.

As shown in fig. 2 and 3, the left end of the sewage discharge pipe 4 is fixedly connected to the center of the bottom of the sewage collection area 22, the right end of the sewage discharge pipe is fixedly connected to the bottom of the annular ditch 3, the right end of the sewage discharge pipe 4 is fixedly connected with an anti-blocking assembly, and the sludge of discharged residue and excrement is prevented from blocking at the pipe orifice of the sewage discharge pipe 4. The valve 41 is fixedly connected to the sewage discharge pipe 4, the valve 41 is used for controlling the on-off of the sewage discharge pipe 4, and the sewage discharge pipe 4 is periodically opened to discharge the sewage in the sewage collection area 22 according to the culture density and the accumulated sewage condition in the culture pond 2. The anti-blocking component that this embodiment adopted includes inner tube 42 with 4 inner wall sliding connection of blow off pipe, and inner tube 42 sliding connection is in the mouth of pipe department of blow off pipe 4, can stretch out or retract the mouth of pipe of blow off pipe 4 along the extending direction of blow off pipe 4, has seted up a plurality of drain 421 along circumference on the inner tube 42 lateral wall, and drain 421 are along the axial extension of inner tube 42, and inner tube 42 has the apron 422 that seals inner tube 42 towards the tip swing joint in the 4 outsides of blow off pipe. When the valve 41 is closed, the inner cylinder 42 is positioned in the sewage discharge pipe 4, when the valve 41 is opened for sewage discharge, sewage with residue and excrement flushes the inner cylinder 42 out of the sewage discharge pipe 4, the inner cylinder 42 extends out of the sewage discharge pipe 4, and the sewage is discharged from a sewage discharge port 421 on the side wall of the inner cylinder 42.

As shown in fig. 2, fig. 3 and fig. 4, the two sides of the extension direction of the sewage pipe 4 are also rotatably connected with the sewage impeller 43, the sewage impeller 43 on one side of the sewage pipe 4 is a group, namely, the two sides of the sewage pipe 4 are respectively provided with a group of sewage impellers 43, each group of sewage impellers 43 comprises two sewage impellers 43, the two sewage impellers 43 are arranged in a vertically staggered manner and are driven to rotate by the same driving part 44, on the central shaft of the two sewage impellers 43 in the same group, the transmission gears which are mutually meshed are fixedly connected, the positions of the two sewage impellers 43 and the sewage outlet 421 of the inner cylinder 42 which extends out of the sewage pipe 4 correspond, and the distance between the axes of the two sewage impellers 43 is greater than the length of the. Therefore, when sewage is discharged, sewage containing residue and excrement is flushed out from the sewage outlet 421 on the inner cylinder 42, the sewage discharge impellers 43 on the two sides rotate under the driving action of the driving piece 44, water is driven to flow around the sewage discharge pipe 4, and deposition and blockage of sewage near the sewage outlet 421 are reduced.

The utility model discloses when using, dig in the periphery of paddy field 1 and establish annular ditch 3 to reserve the open space of installation breed pond 2 at the corner in paddy field 1, locate to dig out the pit that is used for burying underground breed pond 2 in open space, with the ground compaction back of pit, place glass steel pool wall in the pit, the blow off pipe 4 of connecting bottom the dirty district 22 of collection accesss to annular ditch 3 bottoms. After the device is installed, fish are placed into the culture area 21 above the isolation net 23, water on the surface layer is extracted from the annular ditch 3 by the water suction pump 7 and enters the culture pond 2, the oxygen is added into the culture pond 2 by the oxygen adding component 5, a good culture environment is formed, and residue and excrement generated in the culture process fall into the sewage collection area 22 through the isolation net 23 and are deposited on the inclined side wall of the sewage collection area 22. After a certain amount of residue excrement is accumulated in the sewage collecting area 22, a valve 41 on the sewage discharge pipe 4 is opened, the water level in the culture pond 2 is higher than the water level in the annular ditch 3, under the pressure of water level difference, the water in the culture pond 2 is flushed into the sewage discharge pipe 4 and flushes the inner cylinder 42 out of the opening of the sewage discharge pipe 4, water flow forms vortex at the joint of the sewage discharge pipe 4, the residue excrement deposited at the bottom of the sewage collecting area 22 is brought into the sewage discharge pipe 4 and then discharged from the sewage discharge opening 421 of the inner cylinder 42, a sewage discharge impeller 43 outside the sewage discharge opening 421 rotates, water is stirred to flow around, sewage is also brought around, and deposition of the sewage near the opening of the sewage discharge pipe 4 is reduced. After the sewage discharge is finished, the valve 41 is closed, the cover plate 422 at the end part of the inner cylinder 42 is opened, the inner cylinder 42 is pushed back into the sewage discharge pipe 4, and then the cover plate 422 is arranged at the end part of the inner cylinder 42, so that the residue of the sewage in the inner cylinder 42 is reduced.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims (10)

1. The utility model provides a perch recirculating aquaculture device which characterized in that: the rice field cultivation device comprises at least one cultivation pond (2) located at the edge of a rice field (1), wherein a circular ditch (3) is formed in the periphery of the rice field (1), and the cultivation pond (2) is fixedly arranged between the rice field (1) and the circular ditch (3); breed pond (2) including breeding district (21) and collection dirty district (22), breed district (21) and collection dirty district (22) between fixedly connected with separation net (23), one side fixedly connected with blow off pipe (4) of breeding district (21) are kept away from in collection dirty district (22), one end fixed connection in ring ditch (3) bottom of dirty district (22) of collection is kept away from in blow off pipe (4), breed fixedly connected with oxygenation subassembly (5) and inlet tube (6) in district (21), the one end that breeds pond (2) is kept away from in inlet tube (6) is located ring ditch (3), fixedly connected with suction pump (7) are gone up in inlet tube (6).

2. The perch recirculating aquaculture device of claim 1, wherein: the cultivation pond (2) is enclosed by glass fiber reinforced plastics, the cultivation pond (2) is fixedly installed on the corners of the rectangular rice field (1), and the upper edge of the cultivation pond (2) is higher than the rice field (1).

3. The perch recirculating aquaculture device of claim 1, wherein: one end fixedly connected with ball float subassembly that inlet tube (6) are located ring ditch (3), the ball float subassembly keeps the mouth of pipe of inlet tube (6) being close to the surface of water and being less than the surface of water.

4. The perch recirculating aquaculture device of claim 3, wherein: the floating ball component comprises a floating ball piece (61) and a fixing piece (62), the floating ball piece (61) is fixedly connected with the water inlet pipe (6), and the floating ball piece (61) and the water inlet pipe (6) are connected to the fixing piece (62) in a sliding mode.

5. The perch recirculating aquaculture device of claim 1, wherein: the one end fixedly connected with that blow off pipe (4) are located ring ditch (3) bottom prevents stifled subassembly, fixedly connected with valve (41) on the body between preventing stifled subassembly and the dirty district of collection (22).

6. The perch recirculating aquaculture device of claim 5, wherein: prevent stifled subassembly include with blow off pipe (4) inner wall sliding connection's inner tube (42), inner tube (42) are stretched out or are retracted blow off pipe (4) along the extending direction of blow off pipe (4), a plurality of drain (421) have been seted up along circumference on inner tube (42) lateral wall, the axial extension of inner tube (42) is followed in drain (421), inner tube (42) have apron (422) of closed inner tube (42) towards the tip swing joint in the blow off pipe (4) outside.

7. The perch recirculating aquaculture device of claim 6, wherein: the both sides of blow off pipe (4) extending direction rotate and are connected with blowdown impeller (43), blowdown impeller (43) correspond with drain (421) position that inner tube (42) stretched out behind blow off pipe (4).

8. The perch recirculating aquaculture device of claim 7, wherein: the sewage discharge impeller (43) on each side of the sewage discharge pipe (4) is provided with two parts along the extending direction of the sewage discharge port (421), and the distance between the axes of the two parts of the sewage discharge impeller (43) is greater than the length of the sewage discharge port (421).

9. The perch recirculating aquaculture device of claim 8, wherein: the sewage discharging impeller (43) is connected with a driving piece (44) for driving the sewage discharging impeller (43) to rotate, and the rotating directions of the two sewage discharging impellers (43) which are positioned on the same side of the sewage discharging pipe (4) are opposite.

10. The perch recirculating aquaculture device of claim 8, wherein: two sewage discharge impellers (43) which are positioned on the same side of the sewage discharge pipe (4) are arranged in a staggered manner in the horizontal direction.

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