Mandarin fish fry opening pool based on circulating water culture system

Abstract

This utility model relates to the field of fry start-up pond technology, specifically a start-up pond for mandarin fish fry based on a recirculating aquaculture system. The advantages of this utility model are: The direct connection between the fish inlet and the hatching ring pond via a pipe design enables gravity-flow transfer of fry, and the anti-abrasion properties of the PP inner wall reduce the transfer loss rate to below 5%; fry after start-up are discharged to the acclimatization pond with zero contact through the opening and closing of the drain outlet, reducing mechanical damage by up to 90% compared to traditional netting methods; the physical isolation of the movable honeycomb net reduces the fry cannibalism rate from 18% to 0.5%, and combined with the anti-abrasion properties of the PP inner wall, achieves a survival rate of ≥95% during the start-up stage; the circular pond design, through the combination of a 30° conical funnel bottom and a DN100 large-diameter drain outlet, and the synergistic effect of several propulsion nozzles, achieves rapid collection and discharge of uneaten feed and feces; the sewage discharge efficiency is increased by 62.5%, the ammonia nitrogen concentration in the water is reduced to below 0.3 mg / L, and the nitrite concentration is stabilized at 0.05 mg / L.

Description

Technical Field

[0001] This utility model relates to the field of seedling start-up pond technology, and in particular to a mandarin fish seedling start-up pond based on a recirculating aquaculture system. Background Technology

[0002] As a typical carnivorous freshwater economic fish, the artificial breeding technology of mandarin fish is crucial for improving aquaculture efficiency and resource utilization. Among them, the fry incubation stage, that is, the transition period when mandarin fish fry switch from absorbing nutrients from the yolk sac to actively feeding on external food, is a key link that determines the survival rate and later development of fry.

[0003] The existing methods for opening the water spout of mandarin fish have the following defects:

[0004] 1. Square pools have dead corners for sewage discharge, leading to water quality deterioration;

[0005] 2. Manual harvesting and transfer caused stress and death of seedlings (loss rate > 30%);

[0006] 3. Excessive fluctuations in water temperature can affect seedling metabolism. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mandarin fish fry start-up pond based on a recirculating aquaculture system, which effectively solves the deficiencies of the prior art.

[0008] The purpose of this utility model is achieved through the following technical solution: a mandarin fish fry incubation pond based on a recirculating aquaculture system, comprising a circular pond body and a recirculating aquaculture system. The circular pond body is made of PP material, and a conical funnel-shaped sludge discharge tray is provided at the bottom of the circular pond body. A fish inlet channel communicating with the interior of the circular pond body is fixedly connected to the bottom of one side of the circular pond body. At least one set of propulsion nozzles is fixedly connected to the inner wall of the circular pond body, and a water level controller is fixedly connected to the top of one side of the outer wall of the circular pond body. The output end of the sludge discharge tray is connected to... The input end of the water level controller is fixedly connected and connected. The output end of the sewage discharge chassis is also fixedly connected to a normally closed vent. A detachable seedling baffle is fixedly connected to the middle of the inner wall of the circular pool. The seedling baffle is made of PP honeycomb board wrapped with stainless steel mesh. The output end of the recirculating aquaculture system is fixedly connected to an inlet pipe. The inlet pipe is fixedly connected and connected to the input ends of several push nozzles. The input end of the recirculating aquaculture system is fixedly connected to a return pipe. The return pipe is fixedly connected and connected to the output end of the water level controller.

[0009] Preferably, in any of the above schemes, the axes of the plurality of propulsion nozzles form an angle of 15-30° with the tangent of the pool wall, and the outlet flow velocity of the plurality of propulsion nozzles is adjustable in the range of 0.2-0.5m / s.

[0010] The technical effect achieved by adopting the above scheme is: to form a directional circulation, drive the water body to generate centrifugal force, so that uneaten food and feces quickly gather towards the central sewage outlet, while avoiding excessive water flow that would cause the fish fry to consume energy.

[0011] Preferably, in any of the above embodiments, the bottom of the seedling barrier is provided with a slot-type fixing structure that is inserted and fixed to the bottom surface of the inner wall of the circular pool. The mesh size of the seedling barrier is 0.5-1.2mm. The water level controller includes a connecting water tank and a constant water level pipe. The return water pipe is connected to the inside of the connecting water tank. The constant water level pipe is inserted into the inside of the return water pipe. By inserting constant water level pipes of different lengths, the overflow height can be changed through the connecting pipe, thereby realizing automatic control of the water level.

[0012] The technical effects achieved by adopting the above solution are as follows: the slot-type fixing structure enables quick insertion and removal of the fry-blocking baffle; the 0.5-1.2mm mesh design not only prevents fish fry with a body length of ≥3mm from escaping, but also allows feed particles ≤0.3mm to pass through, achieving an isolation effectiveness of 99.8% while maintaining a water exchange rate of ≥85%.

[0013] Preferably, in any of the above schemes, the angle of the conical funnel of the sewage discharge chassis is 30°, and the diameter of the sewage outlet in the center of the sewage discharge chassis is not less than DN100.

[0014] The technical effect achieved by adopting the above solution is: with a 30° cone angle and a DN100 sewage outlet, the sewage is discharged in seconds by utilizing gravity acceleration, and the sewage discharge efficiency is improved by 62.5%.

[0015] Preferably, in any of the above embodiments, the recirculating aquaculture system includes a microfilter, an ultraviolet disinfection module, and a constant temperature module. The microfilter is connected to the return water pipe, the output end of the microfilter is connected to the input end of the ultraviolet disinfection module, the output end of the ultraviolet disinfection module is connected to the input end of the constant temperature module, and the output end of the constant temperature module is connected to the input end of the inlet water pipe.

[0016] The technical effects achieved by adopting the above scheme are: the removal rate of suspended solids in water is ≥95%, the inactivation rate of pathogens is ≥99.9%, the water temperature control accuracy is ±0.5℃, and the energy consumption is reduced by 40%.

[0017] Preferably, in any of the above embodiments, a concrete conical bottom support is fixedly connected to the bottom of the circular pool, and the concrete conical bottom support matches the conical bottom profile of the circular pool.

[0018] The technical effects achieved by adopting the above scheme are: to make the seismic resistance level of the pool reach level 8 and to increase the foundation settlement tolerance by 80%.

[0019] This utility model has the following advantages:

[0020] 1. This mandarin fish fry start-up pond based on a recirculating water system features a direct pipe connection between the fish inlet and the hatching ring pond, enabling gravity-flow transfer of fry. Combined with the anti-abrasion properties of the PP inner wall, the transfer loss rate is reduced to below 5%. After start-up, the fry can be discharged to the acclimatization pond with zero contact through the opening and closing of the drain outlet, reducing mechanical damage by up to 90% compared to traditional netting methods. The physical isolation of the movable honeycomb net reduces the fry cannibalism rate from 18% to 0.5%, and combined with the anti-abrasion properties of the PP inner wall, the survival rate during the start-up stage is ≥95%.

[0021] 2. This mandarin fish fry incubation pond based on a recirculating water system adopts a circular pond design. Through the combination of a 30° conical funnel bottom and a DN100 large-diameter sewage outlet, and with the synergistic effect of several propulsion nozzles, it achieves rapid collection and discharge of uneaten feed and feces. Experimental data shows that compared with traditional ponds, the sewage discharge efficiency of this design is increased by 62.5%, the ammonia nitrogen concentration in the water is reduced to below 0.3 mg / L, and the nitrite concentration is stabilized at 0.05 mg / L.

[0022] 3. The mandarin fish fry start-up pond based on the recirculating water system controls the water temperature fluctuation within the range of 0.8℃ through the titanium alloy plate heat exchanger of the constant temperature module and the water circulation cycle. According to the test, the feeding activity of mandarin fish fry increased by 40% and the metabolic rate increased by 25% in a constant temperature environment of 26±0.5℃, and the start-up time was shortened to 3-5 days. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the water level controller of this utility model.

[0025] In the diagram: 1-Circular pool body, 2-Inlet pipe, 3-Push flow nozzle, 4-Fish inlet channel, 5-Fry barrier, 6-Water level controller, 61-Connecting water tank, 62-Fixed water level pipe, 7-Return water pipe, 8-Sewage discharge tray, 9-Drain outlet, 10-Recirculating aquaculture system, 11-Concrete cone base support. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0027] like Figure 1As shown, a mandarin fish fry inlet pond based on a recirculating aquaculture system includes a circular pond body 1 and a recirculating aquaculture system 10. The circular pond body 1 is made of PP material. A conical funnel-shaped sludge discharge tray 8 is installed at the bottom of the circular pond body 1. A fish inlet channel 4 communicating with the interior of the circular pond body 1 is fixedly connected to the bottom of one side of the circular pond body 1. At least four sets of propulsion nozzles 3 are fixedly connected to the inner wall of the circular pond body 1. A water level controller 6 is fixedly connected to the top of one side of the outer wall of the circular pond body 1. The output end of the sludge discharge tray 8 is connected to the output end of the water level controller 6. The inlet end is fixedly connected and connected. The outlet end of the sewage discharge chassis 8 is also fixedly connected to a normally closed vent 9. A detachable seed-blocking baffle 5 is fixedly connected to the middle of the inner wall of the circular pool body 1. The seed-blocking baffle 5 is made of PP honeycomb board wrapped with stainless steel mesh. The outlet end of the recirculating aquaculture system 10 is fixedly connected to an inlet pipe 2. The inlet pipe 2 is fixedly connected and connected to the input end of several push flow nozzles 3. The input end of the recirculating aquaculture system 10 is fixedly connected to a return water pipe 7. The return water pipe 7 is fixedly connected and connected to the output end of the water level controller 6.

[0028] As an optional technical solution of this utility model: the axis of several propulsion nozzles 3 forms an angle of 15-30° with the tangent of the pool wall, and the outlet flow velocity of several propulsion nozzles 3 is adjustable in the range of 0.2-0.5m / s. By setting the nozzle angle of 15-30° and adjusting the flow velocity of 0.2-0.5m / s, a directional circulation is formed, which drives the water body to generate centrifugal force, so that the uneaten feed and feces quickly gather towards the central sewage outlet, while avoiding the excessive water flow from causing the fish fry to consume energy.

[0029] As an optional technical solution of this utility model: the bottom of the fry-blocking baffle 5 is provided with a slot-type fixing structure and is inserted and fixed to the bottom surface of the inner wall of the circular pool body 1. The mesh size of the fry-blocking baffle 5 is 0.5-1.2mm. The slot-type fixing structure enables the fry-blocking baffle to be quickly inserted and removed. The mesh size of 0.5-1.2mm not only prevents the escape of fry with a body length of ≥3mm, but also allows feed particles ≤0.3mm to pass through, with an isolation effectiveness of 99.8%, while maintaining a water exchange rate of ≥85%. The water level controller 6 includes a connecting water tank 61 and a water level fixing pipe 62. The return water pipe 7 is connected to the inside of the connecting water tank 61. The water level fixing pipe 62 is inserted into the inside of the return water pipe 7. By inserting water level fixing pipes 62 of different lengths, the overflow height can be changed through the connecting pipe, thereby realizing automatic control of the water level.

[0030] As an optional technical solution of this utility model: the conical funnel angle of the sewage discharge chassis 8 is 30° and the sewage discharge port with a diameter of not less than DN100 is set in the center of the sewage discharge chassis 8. The 30° cone angle is combined with the DN100 sewage discharge port to realize the discharge of sewage in seconds by utilizing the acceleration of gravity, thereby improving the sewage discharge efficiency by 62.5%.

[0031] As an optional technical solution of this utility model: the recirculating aquaculture system 10 includes a microfilter, an ultraviolet disinfection module, and a constant temperature module. The microfilter is connected to the return water pipe 7, the output end of the microfilter is connected to the input end of the ultraviolet disinfection module, the output end of the ultraviolet disinfection module is connected to the input end of the constant temperature module, and the output end of the constant temperature module is connected to the input end of the inlet water pipe 2. The constant temperature module adopts a titanium alloy plate heat exchanger. The three-stage treatment of microfilter, ultraviolet disinfection, and titanium alloy plate heat exchanger enables the removal rate of suspended solids in the water to be ≥95%, the inactivation rate of pathogens to be ≥99.9%, the water temperature control accuracy to be ±0.5℃, and the energy consumption to be reduced by 40%.

[0032] As an optional technical solution of this utility model: a concrete cone bottom support 11 is fixedly connected to the bottom of the circular pool 1. The concrete cone bottom support 11 matches the cone bottom contour of the circular pool 1. The concrete support that is completely in contact with the cone bottom of the pool makes the seismic resistance level of the pool reach level 8 and the foundation settlement tolerance is increased by 80%.

[0033] The working process of this utility model is as follows: When the user uses it...

[0034] 1) Open the fish inlet 4 of the hatching ring pool and the opening pool, and use gravity flow velocity ≤0.1m / s to transport the newly hatched mandarin fish fry to the outer ring area of ​​the fry blocking baffle 5 in the opening pool.

[0035] 2) Insert the regulating pipe at the preset height through the water level controller 6 to stabilize the water level in the pool at 50-80cm, adjusting according to the density of water splashes;

[0036] 3) Turn on the propulsion nozzle 3, set the flow rate to 0.2-0.5 m / s, and make an angle of 15-30° between the nozzle and the tangent of the pool wall to drive the water to form a centrifugal circulation;

[0037] 4) Start the circulating water treatment system 10. Water flows through the microfilter to remove particles ≥80μm → UV disinfection at 30mJ / cm 2 Irradiation dose → Temperature control accuracy of titanium alloy plate heat exchanger ±0.5℃ → Reflux to open pool, cycle 15-30 minutes / time;

[0038] 5) Insert a movable honeycomb net with 5 mesh openings of 0.5-1.2mm to isolate the opening area from the central sewage discharge area. Adjust the net height to 1 / 3-2 / 3 of the pond body according to the growth stage of the fish fry.

[0039] 6) Open the drain valve 8 on the drain tray 3-5 times a day for 10-15 seconds each time to use gravity to discharge the sediment through the return water pipe 7 to the water treatment system;

[0040] 7) After the opening is completed, remove the fry-blocking baffle 5 and open the drain outlet 9. The fry will flow with the water to the acclimatization pond at a flow rate of 0.3-0.6 m / s.

[0041] 8) After the breeding cycle is over, fully open the drain outlet to drain all the water from the pool. Use a high-pressure water gun with a pressure of ≥5MPa to rinse the pool walls and honeycomb nets.

[0042] In summary, this invention achieves gravity-flow transfer of fry through a direct pipe connection between the fish inlet and the hatching ring pool. Combined with the anti-scratch properties of the PP inner wall, the transfer loss rate is reduced to below 5%. After hatching, the fry can be discharged to the acclimatization pool with zero contact via the opening and closing of the drain outlet, reducing mechanical damage by up to 90% compared to traditional netting methods. The physical isolation of the movable honeycomb net reduces the cannibalism rate of fry from 18% to 0.5%. Combined with the anti-scratch properties of the PP inner wall, the survival rate during the hatching stage is ≥95%. The combination of a 30° conical funnel bottom and a DN100 large-diameter drain outlet, along with the synergistic effect of several propulsion nozzles, enables rapid collection and discharge of uneaten food and feces. Experimental data shows that compared to traditional ponds, this design improves sewage discharge efficiency by 62.5%, reduces ammonia nitrogen concentration to below 0.3 mg / L, and stabilizes nitrite concentration at 0.05 mg / L. The recirculating aquaculture system 10 uses a titanium alloy plate heat exchanger in a constant temperature module to control the water temperature fluctuation within 0.8℃. Tests have shown that mandarin fish fry exhibit 40% increased feeding activity, 25% increased metabolic rate, and a shorter feeding time of 3-5 days when kept at a constant temperature of 26±0.5℃.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mandarin juvenile fish opening pool based on a recirculating aquaculture system, characterized in that: The system includes a circular pool (1) and a recirculating aquaculture system (10). The circular pool (1) is made of PP material. A conical funnel-shaped wastewater discharge tray (8) is provided at the bottom of the circular pool (1). A fish inlet channel (4) communicating with the inside of the circular pool (1) is fixedly connected to the bottom of one side of the circular pool (1). At least four sets of push nozzles (3) are fixedly connected to the inner wall of the circular pool (1). A water level controller (6) is fixedly connected to the top of one side of the outer wall of the circular pool (1). The output end of the wastewater discharge tray (8) is fixedly connected to and communicates with the input end of the water level controller (6). The output end of the sewage discharge chassis (8) is also fixedly connected to a normally closed vent (9). A detachable seedling baffle (5) is fixedly connected to the middle of the inner wall of the circular pool (1). The seedling baffle (5) is made of PP honeycomb board wrapped with stainless steel mesh. The output end of the recirculating aquaculture system (10) is fixedly connected to an inlet pipe (2). The inlet pipe (2) is fixedly connected to and communicates with the input ends of several push nozzles (3). The input end of the recirculating aquaculture system (10) is fixedly connected to a return water pipe (7). The return water pipe (7) is fixedly connected to and communicates with the output end of the water level controller (6).

2. The mandarin fish fry start-up pond based on a recirculating aquaculture system according to claim 1, characterized in that: The axes of several of the propulsion nozzles (3) form an angle of 15-30° with the tangent of the pool wall, and the outlet flow velocity of several of the propulsion nozzles (3) is adjustable in the range of 0.2-0.5m / s.

3. The mandarin fish fry start-up pond based on a recirculating aquaculture system according to claim 1, characterized in that: The bottom of the seedling barrier (5) is provided with a slot-type fixing structure and is inserted and fixed to the bottom surface of the inner wall of the circular pool (1). The mesh size of the seedling barrier (5) is 0.5-1.2mm. The water level controller (6) includes a connecting water tank (61) and a water level control pipe (62). The return water pipe (7) is connected to the inside of the connecting water tank (61). The water level control pipe (62) is inserted into the inside of the return water pipe (7).

4. The mandarin fish fry start-up pond based on a recirculating aquaculture system according to claim 1, characterized in that: The angle of the conical funnel of the sewage discharge chassis (8) is 30°. The sewage discharge port with a diameter of not less than DN100 is provided in the center of the sewage discharge chassis (8).

5. The mandarin fish fry start-up pond based on a recirculating aquaculture system according to claim 1, characterized in that: The recirculating aquaculture system (10) includes a microfilter, an ultraviolet disinfection module and a constant temperature module. The microfilter is connected to the return water pipe (7). The output end of the microfilter is connected to the input end of the ultraviolet disinfection module. The output end of the ultraviolet disinfection module is connected to the input end of the constant temperature module. The output end of the constant temperature module is connected to the input end of the inlet pipe (2). The constant temperature module uses a titanium alloy plate heat exchanger.

6. The mandarin fish fry start-up pond based on a recirculating aquaculture system according to claim 1, characterized in that: The bottom of the circular pool (1) is fixedly connected to a concrete cone bottom support (11), which matches the cone bottom profile of the circular pool (1).

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