An indoor circulating water culture system for ricefield eel

Abstract

The application discloses an indoor circulating water breeding system for ricefield eels, which comprises a plurality of breeding boxes and a water circulation module, and further comprises a breeding frame, wherein the breeding frame comprises a breeding box mounting area and a water treatment area; the breeding boxes are mounted in the breeding box mounting area; each breeding box is provided with a partition plate, which divides the breeding box into a breeding area and a waste discharge area; the partition plate is provided with a plurality of round holes with a diameter of 0.1-0.3 cm, and the distance between adjacent round holes is 0.5-0.7 cm; the waste discharge area is provided with a waste discharge port at the bottom, which is connected to the water treatment area through a backwater pipeline; the water circulation module comprises a water inlet pipeline, a water inlet pipe and a circulating water pump; one end of the water inlet pipe is inserted into the bottom of the breeding area, and the other end is connected to the water inlet pipeline; the water inlet pipeline is connected to the water treatment area; and the circulating water pump is used for pumping the purified water in the water treatment area into the water inlet pipe. The round holes with specific diameters and distances on the partition plate and the bottom water inlet pipe are combined to realize the unification of the ricefield eel escape prevention and efficient waste discharge, so that the survival rate and growth speed of the ricefield eels are improved.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, and in particular to an indoor recirculating aquaculture system for eels. Background Technology

[0002] The yellow eel is a unique freshwater fish in my country, with high nutritional and economic value, and a large market demand that exceeds supply.

[0003] Pond cage culture is currently the most common method for eel farming. First, net cages are hung in the pond, then aquatic plants are planted inside to provide a habitat for the eels, and finally, eel fry are released for rearing. However, pond cage culture of eels is susceptible to weather conditions, resulting in low survival rates. It also has limited feeding time throughout the year, requires boating for feeding, and incurs high labor costs. The sustainable development of the eel industry urgently requires the development of new eel farming models to address the industry's problems of low fry survival rates due to the lack of efficient fry cultivation methods and high risks associated with weather-dependent adult eel farming.

[0004] Recirculating aquaculture systems for fish are a type of intensive, factory-style aquaculture that provides stable and controllable environmental conditions for fish growth, eliminating the influence of natural weather and achieving efficient, intelligent, and green aquaculture technology. Efficient sludge collection and discharge are crucial foundations for the success of a recirculating aquaculture system. Eels have cylindrical bodies, like to burrow; they lack fins, cannot swim, adapt to shallow water, and need burrows to survive in deeper water; they do not rely on oxygen in the water and need to periodically surface to breathe air through their oropharynx; eels are timid and easily stressed. The development of recirculating aquaculture systems for eels must fully consider the special habits of eels, solving both escape prevention and ensuring efficient sludge collection and discharge. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the technical problem to be solved by this invention is to propose an indoor recirculating aquaculture system for eels. By setting circular holes of specific diameter and spacing on the partition and cooperating with the bottom water inlet pipe to flush out sludge, the system achieves a balance between preventing eels from escaping and efficient sludge removal, thereby improving the survival rate and growth rate of eels.

[0006] One technical solution adopted in this invention is: an indoor recirculating aquaculture system for eels, comprising several culture boxes and a water circulation module.

[0007] It also includes a breeding rack, which includes a breeding box installation area and a water treatment area; the breeding box is installed in the breeding box installation area;

[0008] Each of the breeding boxes is provided with a partition, which divides the breeding box into a breeding area and a waste disposal area;

[0009] The partition is covered with circular holes of 0.1-0.3cm, and the distance between adjacent circular holes is 0.5-0.7cm;

[0010] The bottom of the sewage discharge area is provided with a sewage outlet, which is connected to the water treatment area through a return water pipeline;

[0011] The water circulation module includes an inlet pipe, an inlet tube, and a circulating water pump. One end of the inlet tube extends into the bottom of the aquaculture area, and the other end is connected to the inlet pipe. The inlet pipe is connected to the water treatment area. The circulating water pump is used to pump the purified water in the water treatment area into the inlet pipe.

[0012] Furthermore, the water circulation module also includes an ultraviolet sterilizer and a heating and cooling unit, which are connected in series in the water inlet pipe.

[0013] Furthermore, it also includes a lighting module, which is mounted on the breeding rack and faces the breeding box.

[0014] Furthermore, it also includes an air intake module, which includes an air pump, an air intake pipeline, and an air intake pipe; one end of the air intake pipe extends into the bottom of the breeding area, and the other end is connected to the air pump through the air intake pipeline.

[0015] Furthermore, the bottom surface of the sewage accumulation and discharge area slopes towards the sewage outlet from all sides, forming a concentrated slope bottom structure.

[0016] Furthermore, the sewage outlet is provided with inner and outer sleeves, the inner and outer sleeves comprising:

[0017] The outer sleeve has a grid hole at its bottom and its top is higher than the maximum water level line; the diameter of the grid hole is larger than the diameter of the circular hole.

[0018] An inner sleeve is disposed inside the outer sleeve, with its bottom connected to the drain outlet and its top open.

[0019] Furthermore, the partition is made of acrylic or stainless steel.

[0020] Furthermore, the top of the breeding box is provided with inward and outward extending eaves.

[0021] Furthermore, the water treatment area includes a treatment tank, which is provided in sequence with a sedimentation tank area, a filtration tank area, a biological tank area and a pump tank area.

[0022] The sedimentation tank area is connected to the return water pipeline;

[0023] The filtration tank area is equipped with filter bags, which are connected to the sedimentation tank area through overflow holes provided on the side wall of the sedimentation tank area.

[0024] The biological pool area is equipped with biological packing material, and the biological pool area is connected to the filtration pool area;

[0025] The pump pool area is equipped with a circulating water pump, and the pump pool area is connected to the biological pool area. The water inlet pipe is connected to the pump pool area.

[0026] Furthermore, the breeding rack has a 3-4 layer structure, with the bottom layer being a water treatment area and the top layer being a 2-3 layer breeding box installation area.

[0027] The indoor recirculating aquaculture system for swamp eels of the present invention has at least the following beneficial effects:

[0028] First, by setting round holes with specific diameters and spacing on the partition, and cooperating with the bottom water inlet pipe to flush out the sludge, it can effectively prevent the eels from escaping and quickly push the sludge from the breeding area to the sewage discharge area, thus achieving a combination of escape prevention and efficient sewage discharge.

[0029] Secondly, the breeding rack integrates the breeding box installation area and the water treatment area into one unit. With the help of the water circulation module, it can achieve precise control of water temperature, water quality and light, get rid of the influence of natural weather, and can produce continuously all year round, greatly reducing labor costs.

[0030] Third, the survival rate of newly hatched eel seedlings can reach 90%, and the survival rate of juvenile eels can reach 97.78%. After 100 days of cultivation, the weight gain rate of newly hatched eels reaches 55,768%, which significantly improves the survival rate and growth rate of eels.

[0031] Fourth, the stocking density can reach 3,500 fish per cubic meter of water, and the output efficiency per unit water body is much higher than that of traditional pond and cage aquaculture. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0033] Figure 1 This is a front view structural diagram of an indoor recirculating aquaculture system for eels according to the present invention.

[0034] Figure 2 This is a right-side view of the breeding box structure of an indoor recirculating water aquaculture system for shad, according to the present invention.

[0035] Figure 3 This is a rear view structural diagram of the wastewater discharge area of ​​the breeding box in an indoor recirculating aquaculture system for eels according to the present invention.

[0036] Figure 4This is a front view schematic diagram of the outer sleeve at the drain outlet inside the breeding box of an indoor recirculating water aquaculture system for shad, according to the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-Aquaculture rack; 2-Aquaculture box; 3-Treatment tank; 4-Filter; 5-Circulating water pump; 6-Ultraviolet sterilizer; 7-Heating and cooling unit; 8-Lighting system; 9-Air pump; 10-Control cabinet; 11-Inlet water pipe; 12-Return water pipe; 13-Air supply pipe; 14-Inlet water pipe; 15-Air inlet pipe; 16-Inlet water pipe valve; 201-Eaves; 202-Partition; 203-Aquaculture area; 204-Accumulated sewage discharge area; 205-Outer sleeve; 206-Inner sleeve; 207-Sewage outlet; 208-Grate hole; 301-Sedimentation tank area; 302-Filtration tank area; 303-Biological tank area; 304-Pump tank area; 305-Automatic water replenishment valve; 306-Filter bag; 307-Biological packing material. Detailed Implementation

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] Please see Figure 1 This is a front view structural diagram of an indoor recirculating aquaculture system for eels according to the present invention. The main components of this embodiment include a culture rack 1, a culture box 2, a treatment tank 3, a filter 4, a circulating water pump 5, an ultraviolet sterilizer 6, a heating and cooling unit 7, a lighting system 8, an air pump 9, a control cabinet 10, an inlet water pipe 11, a return water pipe 12, and an air supply pipe 13.

[0041] The source water for the aquaculture system is tap water. After being filtered by filter 4, the tap water enters the pump area 304 of treatment tank 3. A circulating water pump 5 draws the water from pump area 304, which then flows through inlet pipe 11 to UV sterilizer 6 for disinfection. A heater 7 heats or cools the water, and then the water is distributed to each aquaculture box 2 through inlet pipe 14 inserted into the bottom of the box. The water flows out through drain outlet 207 and back into treatment tank 3 via inlet and return pipes 12. After sedimentation in sedimentation tank area 301, the clear water flows through overflow hole to filter bags 306 in filtration tank area 302 for further filtration. It then enters biological tank area 303 containing biological packing material 307 for purification, and finally enters pump area 304. The circulating water pump 5 in pump area 304 pumps the treated water back to each aquaculture box 2 for recycling. The drain valve in sedimentation tank area 301 is opened weekly for one minute to drain the water; the system automatically replenishes water via automatic water replenishment valve 305. During the aquaculture process, the temperature, dissolved oxygen, and ambient light of the aquaculture water are controlled by the heating / cooling unit 7, the air pump 9, and the lighting system 8 to achieve efficient aquaculture. By extending the water inlet pipe 14 and the air inlet pipe 15 to the bottom of the aquaculture box 2, the water and air flow are used to fully agitate the water, ensuring that all waste is flushed from the aquaculture area 203 to the waste accumulation and discharge area 204. The slope of the waste accumulation and discharge area 204 is then used to further concentrate the waste near the discharge outlet 207. Finally, the siphon effect created by the double-layer pipe design allows all the waste to be discharged. The water flow rate of the water inlet pipe 14 is controlled by the water inlet valve 16.

[0042] The breeding rack 1 has 3-4 layers and is welded from stainless steel. The top 2-3 layers hold breeding boxes 2, and a lighting system 8 is hung on the top of the breeding rack 1 above the breeding boxes 2. The bottom layer of the breeding rack 1 contains a treatment tank 3, a filter 4, an ultraviolet sterilizer 6, and a heating and cooling unit 7. An air pump 9 is installed on the ground side of the breeding rack 1, and a control cabinet 10 is hung on the side of the breeding rack 1 to control the circulating water pump 5, the ultraviolet sterilizer 6, the heating and cooling unit 7, the lighting system 8, and the air pump 9.

[0043] Please see Figures 2-4The breeding box 2 has an open top with 1-5cm inverted eaves 201 extending inwards and outwards from the top. The inner eaves prevent eels from escaping along the edges of the breeding box 2, while the outer eaves facilitate the handling of the breeding box 2. The breeding box 2 is equipped with a lid made of transparent acrylic material, which provides insulation while allowing light to pass through, ensuring the necessary lighting for breeding. The lid has two 5*5cm holes: one for the water inlet pipe 14 and the air inlet pipe 15, and the other for feeding. The breeding box 2 is equipped with a partition 202, which divides the breeding box 2 into a breeding area 203 and a waste collection and disposal area 204. The partition 202 is made of acrylic or stainless steel and is covered with round holes with a diameter of 0.1-0.3mm, spaced 0.5-0.7cm apart. The partition 202 prevents eels from escaping while allowing waste to pass through. On the other side of partition 202 is a wastewater collection area 204, which is 10-15cm wide and has a wastewater outlet 207 in the middle. The slope of the wastewater outlet 207 gradually increases on both sides, and the outlet is located at the bottom of the slope to ensure that waste can be collected at the outlet. The wastewater outlet 207 achieves efficient wastewater discharge and water level control through a sleeve structure. The outer sleeve 205 has a grid hole 208 at the bottom for suction, and the inner sleeve 206 controls the water level. The grid hole 208 at the bottom of the outer sleeve 205 can create a siphon effect, making it easier for waste to enter the middle area of ​​the inner and outer sleeves, and then be discharged through the top of the inner sleeve 206. The length of the inner sleeve 206 is the height of the water level, and the water level of the aquaculture box 2 is controlled by changing the length of the inner sleeve 206.

[0044] The treatment tank 3 is a square box made of gray PP or metal, divided into a sedimentation tank area 301, a filtration tank area 302, a biological tank area 303, and a pump tank area 304. The sedimentation tank area 301 has a horizontal perforated baffle 10cm from the top. Filter cotton is laid on the baffle to perform the first filtration of the aquaculture water flowing into the treatment tank 3. The filtered water flows through the holes in the horizontal baffle to the bottom of the sedimentation tank area 301. After the water level in the sedimentation tank area 301 rises, it flows through an overflow hole in the partition between the sedimentation tank area 301 and the filtration tank area 302 into the filter bag 306 in the filtration tank area 302 (it should be noted that this overflow hole is located below the aforementioned horizontal baffle to prevent impurities from the first filtration above the horizontal baffle from entering the filter bag 306). The filter bag 306 in the filtration tank area 302 can be set as a 100-mesh filter bag, which can perform a second filtration of the aquaculture return water. The water then flows to the bottom of the biological tank area 303, which is filled with biological packing material 307. The water filtered through the biological tank area 303 flows into the pump tank area 304 through the opening at the bottom of the biological tank area 303. The pump tank area 304 is equipped with a circulating water pump 5 and an automatic water replenishment valve 305.

[0045] Example 1

[0046] In this embodiment, the aquaculture rack 1 has four layers, with the top three layers holding three aquaculture boxes 2, for a total of nine boxes 2. The boxes are made of beige-gray PP material, with an inner rim of 1cm, a length of 42.5cm, a width of 28cm, and a height of 13.5cm. The partition 202 is made of transparent acrylic material, 0.5cm thick, with 0.1cm diameter holes spaced 0.5cm apart. The outer sleeve 205 of the drain outlet 207 has an inner diameter of 3.5cm and a length of 10cm, while the inner sleeve 206 has an inner diameter of 2cm and a length of 3cm, indicating a water depth of 3cm in the aquaculture boxes 2. The system is run for 5 days before aquaculture. Purchase newly hatched eel larvae from a breeding company. Their average weight is 0.0128±0.001g. After one day of settling, change 1 / 5 of the water daily, replenishing with the same volume of water from the circulating water system. On the fifth day, once the larvae have fully adapted to the system, release them into individual rearing boxes (2), 15 larvae per box. Place 2 / 3 of the box with black shade netting for hiding and resting. Maintain the temperature at 28±1℃ using a heater / cooler (7); control the light intensity at 30-70 Lx using a lighting system (8), with 8 hours of light followed by 16 hours of darkness; control the flow rate using the inlet valve (16). The inlet pipe (14) has an inner diameter of 1cm and a flow rate of 30mL / s. Feed them tubifex worms every morning. Before feeding, disinfect the tubifex worms with a 2% saline solution for 3 minutes, then rinse them 5 times with tap water. Feed them 2% of their total weight. Before feeding, turn off the circulating water pump 5, then feed the animals. Turn the circulating water pump 5 back on half an hour later. Clean the filter bag 306 once a week and disinfect it with povidone-iodine. After draining the sedimentation tank for 1 minute, the system will automatically replenish the water. After 100 days of rearing, the final average weight was 9.70 ± 0.35 g. The specific growth parameters are shown in Table 1.

[0047] Table 1. Growth parameters of 100-day rearing of yellow eel fry.

[0048] Survival rate (%) Initial body length (cm) Final body length (cm) Initial average weight (g) Final average weight (g) Weight gain rate (%) 89.52±3.81 2.88±0.04 22.02±0.22 0.0128±0.001 9.70±0.35 75194±2908

[0049] Example 2

[0050] The circulating water system used in this implementation case is basically the same as that in Implementation Case 1, the only difference being that the diameter of the round holes on the baffle 202 is 0.3 cm and the spacing between the holes is 0.7 cm. The eels were artificially bred fry with an initial weight of 3.69 ± 0.03 g. After 61 days of rearing, the final average weight was 22.21 ± 0.30 g. Specific growth data are shown in Table 2.

[0051] Table 2. Growth parameters of yellow eel fry after 66 days of rearing.

[0052] Survival rate (%) Initial body length (cm) Final body length (cm) Initial average weight (g) Final average weight (g) Weight gain rate (%) 97.78±3.85 17.50±0.34 29.45±0.17 3.69±0.03 22.21±0.30 502.4±11.28

[0053] In this embodiment, the aquaculture rack 1 has three layers, with the top two layers holding two aquaculture boxes 2, for a total of four boxes 2. The aquaculture boxes 2 are made of beige PP material, with an inner rim of 6cm, a length of 62cm, a width of 52cm, and a height of 37cm. The partition 202 is made of 304 stainless steel, 0.2cm thick, with 0.3cm diameter holes spaced 0.7cm apart. The outer sleeve 205 of the drain outlet 207 has an inner diameter of 4.5cm and a length of 35cm, while the inner sleeve 206 has an inner diameter of 2.8cm and a length of 25cm, indicating a water depth of 25cm in the aquaculture boxes 2. The system is run for 5 days before aquaculture. The temperature is controlled at 28±1℃ by the heater 7; the light intensity is controlled at 30-70 Lx by the lighting system 8, with 8 hours of light followed by 16 hours of darkness; the flow rate is controlled by the inlet valve 16, with an inner diameter of 1cm in the inlet pipe 14 and a flow rate of 60mL / s. Commercially prepared eel feed is given every morning. First, add water equal to 50% of the feed weight and soak for 10 minutes until softened. Then, feed the eel at a ratio of 2% of its total weight. The circulating water pump (5) is kept running during feeding. Two plecos are kept in each rearing box to clean the inner walls of the box. The filter bags (306) are cleaned weekly and disinfected with povidone-iodine. The system automatically replenishes water after draining the sedimentation tank for one minute by opening the drain valve.

[0054] The above description merely illustrates preferred embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. An indoor recirculating aquaculture system for eels, comprising several culture boxes and a water circulation module, characterized in that, It also includes a breeding rack, which includes a breeding box installation area and a water treatment area; the breeding box is installed in the breeding box installation area; Each of the breeding boxes is provided with a partition, which divides the breeding box into a breeding area and a waste disposal area; The partition is covered with circular holes of 0.1-0.3cm, and the distance between adjacent circular holes is 0.5-0.7cm; The bottom of the sewage discharge area is provided with a sewage outlet, which is connected to the water treatment area through a return water pipeline; The water circulation module includes an inlet pipe, an inlet tube, and a circulating water pump. One end of the inlet tube extends into the bottom of the aquaculture area, and the other end is connected to the inlet pipe. The inlet pipe is connected to the water treatment area. The circulating water pump is used to pump the purified water in the water treatment area into the inlet tube.

2. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The water circulation module also includes an ultraviolet sterilizer and a heating and cooling unit, which are connected in series in the water inlet pipe.

3. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, It also includes a lighting module, which is mounted on the breeding rack and faces the breeding box.

4. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, It also includes an air intake module, which includes an air pump, an air intake pipeline, and an air intake pipe; one end of the air intake pipe extends into the bottom of the breeding area, and the other end is connected to the air pump through the air intake pipeline.

5. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The bottom surface of the sewage accumulation and discharge area slopes towards the sewage outlet from all sides, forming a concentrated slope bottom structure.

6. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The sewage outlet is provided with inner and outer sleeves, the inner and outer sleeves comprising: The outer casing has a grid hole at its bottom and its top is above the maximum water level line, and is equipped with a sealing cap; the diameter of the grid hole is larger than the diameter of the circular hole. An inner sleeve is disposed inside the outer sleeve, with its bottom connected to the drain outlet and its top open.

7. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The partition is made of acrylic or stainless steel.

8. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The top of the breeding box has inward and outward extending eaves.

9. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The water treatment area includes a treatment tank, which is sequentially equipped with a sedimentation tank area, a filtration tank area, a biological tank area and a pump tank area. The sedimentation tank area is connected to the return water pipeline; The filtration tank area is equipped with filter bags, which are connected to the sedimentation tank area through overflow holes provided on the side wall of the sedimentation tank area. The biological pool area is equipped with biological packing material, and the biological pool area is connected to the filtration pool area; The pump pool area is equipped with a circulating water pump, and the pump pool area is connected to the biological pool area. The water inlet pipe is connected to the pump pool area.

10. The indoor recirculating aquaculture system for eels as described in claim 1, characterized in that, The breeding rack has a 3-4 layer structure. The bottom layer of the breeding rack is a water treatment area, and the top layer of the water treatment area is a 2-3 layer breeding box installation area.

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