A constant temperature incubator for rearing rainbow trout fry

Abstract

The application discloses a constant-temperature hatching device special for rainbow trout fry cultivation, and relates to the technical field of aquaculture equipment, which comprises an external heat insulation box body, multiple layers of independent hatching units, a water circulation control system, a main water inlet pipe and a water return pipeline. The hatching unit is of a drawer type structure, is provided with a flow equalizing plate and a conical flow guiding hole at the bottom, forms an upwelling type suspended flow field from bottom to top, and makes fish eggs uniformly suspended and rolled. The water circulation system is integrated with a circulating pump, a refrigeration and heating module, an ultraviolet sterilizer and an oxygen dissolving and increasing device, so that accurate control of water temperature, control of dissolved oxygen content and continuous sterilization are realized. Overflow ports are arranged at the upper parts of the units, water is recycled after being filtered through the water return pipeline, and a closed loop system is formed. The application has the advantages of constant-temperature stability, uniform dissolved oxygen, easy operation, high space utilization and the like, can significantly improve the hatching rate of rainbow trout eggs and the quality of fry, and is suitable for large-scale fry cultivation production.

Description

Technical Field

[0001] This invention relates to the field of aquaculture equipment technology, specifically to a constant-temperature incubation device for rainbow trout fry cultivation. Background Technology

[0002] Rainbow trout (Oncorhynchus mykiss) are typical cold-water fish, and the hatching of their fertilized eggs requires extremely demanding environmental conditions. The optimal hatching temperature range is 10-12°C, and the water must have sufficient dissolved oxygen (usually >7mg / L). The water must also be kept flowing to remove metabolic waste and prevent the growth of water mold.

[0003] In existing technologies, common incubation equipment mainly includes parallel trough incubators and jar incubators. Parallel trough incubators occupy a large area and usually use series water flow, resulting in significantly lower water quality and dissolved oxygen levels at the rear compared to the front, leading to uneven hatching rates.

[0004] Although the hatching tank utilizes the principle of upward water flow, it usually supplies water through gravity drop, making it difficult to achieve precise closed-loop constant temperature control. Furthermore, the process of removing dead eggs can easily disturb the healthy fish eggs at the bottom.

[0005] Furthermore, in summer or in areas with large temperature fluctuations, open systems that rely on natural water temperature often result in the complete loss of fish eggs.

[0006] Therefore, there is an urgent need for a specialized incubation device that can precisely control temperature, provide uniform dissolved oxygen, maximize space utilization, and is easy to manage. Summary of the Invention

[0007] The purpose of this invention is to provide a constant temperature incubation device for rainbow trout fry cultivation, so as to solve the problems of unstable temperature control, uneven dissolved oxygen distribution and difficulty in removing dead eggs in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a constant temperature incubation device for rainbow trout fry cultivation, comprising an external heat-insulating box, multiple independent incubation units, a water circulation control system, a main water inlet pipe and a return water pipe, wherein the external heat-insulating box is provided with an incubation chamber and an equipment chamber, the multiple independent incubation units are stacked inside the incubation chamber, and the water circulation control system is located inside the equipment chamber;

[0009] The water circulation control system includes a circulation pump, a cooling and heating module, an ultraviolet sterilizer, and a dissolved oxygen enrichment device. The circulation pump, cooling and heating module, ultraviolet sterilizer, and dissolved oxygen enrichment device are all installed inside the equipment cavity. The circulation pump is connected to the bottom water inlet of each of the independent incubation units through a main water inlet pipe. The cooling and heating module can adjust the temperature of the water flowing into the independent incubation unit. The ultraviolet sterilizer can sterilize the water flowing into the independent incubation unit. The dissolved oxygen enrichment device is used to ensure the dissolved oxygen content of the water in the independent incubation unit.

[0010] Each of the independent incubation units is provided with an overflow port at the top, which is connected to the return water pipeline and flows back to the input end of the circulation pump to form a closed loop circulation.

[0011] Preferably, the independent incubation unit adopts a drawer-type structure. Each independent incubation unit includes an outer frame and a sliding inner screen tray. The bottom of the outer frame is provided with a flow equalization plate. The branch pipe of the main water inlet pipe is connected to the bottom of the flow equalization plate, so that the water flows vertically through the inner screen tray from bottom to top, forming an upward floating flow field.

[0012] Preferably, the flow equalization plate has a plurality of conical guide holes evenly distributed thereon.

[0013] Preferably, the diameter of the conical guide hole gradually increases from bottom to top, which is used to reduce the inflow velocity and increase the uniformity of water flow diffusion.

[0014] Preferably, the cooling and heating module includes a titanium tube chiller and a heating box, both of which are connected in series at the output end of the circulating pump.

[0015] Preferably, the cooling and heating module further includes an intelligent temperature controller and temperature sensors (20) distributed within the incubation chamber. The intelligent temperature controller is configured to maintain the circulating water temperature between 9°C and 14°C, with a control accuracy of ±0.5°C.

[0016] Preferably, the dissolved oxygen aeration device is a Venturi jet generator or a nanobubble generator, connected in series with the outlet of the circulating pump to ensure that the dissolved oxygen content of the water entering the independent incubation unit is not less than 8 mg / L.

[0017] Preferably, a filter cylinder is also fixedly installed inside the equipment cavity. The filter cylinder is connected in series between the return water pipeline and the input end of the circulation pump. The ultraviolet sterilizer is installed inside the filter cylinder, and the filter cylinder is also equipped with removable and replaceable filter cotton and bio-balls.

[0018] Preferably, the walls of the external heat-insulating box are made of double-layer stainless steel with a polyurethane foam insulation layer in between, and the front of the external heat-insulating box is provided with a transparent double-layer hollow glass observation window.

[0019] A method for hatching rainbow trout fry using a dedicated constant-temperature hatching device includes the following steps:

[0020] S1, Equipment preparation and water conditioning:

[0021] Start the water circulation control system and adjust the circulation pump flow rate to maintain the water flow rate of each independent incubation unit at 0.2 to 0.5 L / min; stabilize the circulating water temperature within the range of 9°C to 14°C through the cooling and heating module, with a control accuracy of ±0.5°C; start the dissolved oxygen aeration device to ensure that the dissolved oxygen content of the water entering each independent incubation unit is not less than 8 mg / L; turn on the ultraviolet sterilizer to continuously sterilize the circulating water.

[0022] S2, Fish egg loading:

[0023] Spread the rainbow trout fertilized eggs evenly on the inner screen tray of each independent incubation unit; push the inner screen tray in to automatically seal the bottom water inlet to the branch pipe of the main water inlet.

[0024] S3, Incubation Process Management:

[0025] Water flows through the main inlet pipe to the flow equalization plate at the bottom of each independent hatching unit. It is then decelerated and flows upward through the conical guide holes, forming a vertically upward suspended flow field that keeps the fish eggs in a slightly tumbling state, preventing them from piling up. The development of the fish eggs is checked regularly through the transparent double-layer hollow glass observation window, and dead or abnormal eggs can be removed at any time by pulling out the corresponding drawer-type independent hatching unit. The operation does not interfere with other independent hatching units.

[0026] S4, Water Quality Maintenance:

[0027] The circulating water enters the return water pipeline through the overflow port at the top of each independent incubation unit, flows through the filter tank for physical filtration and biochemical treatment, and then is sterilized by the ultraviolet sterilizer before returning to the circulation pump to form a closed loop; the filter cotton and bio-balls in the filter tank are cleaned or replaced regularly.

[0028] S5, Hatching and Transfer:

[0029] Once the fish eggs have developed to the eye stage or hatched, the water inlet of the corresponding independent hatching unit is closed, the inner screen tray is removed as a whole, and the fry or larvae with yolk sacs are transferred to the subsequent rearing facilities.

[0030] S6, System Cleaning and Disinfection:

[0031] After one batch of hatching is completed, the water in the device is drained, and all independent hatching units, filter tanks and pipelines are cleaned and disinfected in preparation for the next use.

[0032] Beneficial effects

[0033] This invention provides a constant temperature incubation device specifically for rainbow trout fry rearing, which has the following beneficial effects:

[0034] 1. This special constant temperature incubation device for rainbow trout fry cultivation, through the setting of a cooling and heating module, an intelligent temperature controller and a temperature sensor, can achieve precise control of the circulating water temperature within the range of 9°C to 14°C, unaffected by fluctuations in external temperature, ensuring that rainbow trout eggs hatch in the optimal temperature environment, and enabling efficient fry cultivation throughout the year.

[0035] 2. This constant temperature incubation device for rainbow trout fry rearing uses a bottom flow equalization plate and conical guide holes to create a vertical water flow from bottom to top, which keeps the fish eggs in a slightly tumbling and suspended state. This effectively prevents stacking, lack of oxygen and water mold growth, simulates a natural spring environment, and improves the uniformity of hatching and the survival rate.

[0036] 3. This special constant temperature incubation device for rainbow trout fry rearing features an independent incubation unit with a drawer-type design, allowing for individual operation by pulling it out. This facilitates observation, removal of dead eggs, or transfer of fry, and ensures that each unit does not interfere with the others, greatly improving operational convenience and management efficiency.

[0037] 4. This special constant temperature incubation device for rainbow trout fry cultivation integrates filtration, sterilization, oxygenation and temperature control, realizing water circulation purification and parameter optimization, ensuring clean and stable water quality, reducing the incidence of diseases and improving the overall health of the fry. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a constant temperature incubation device for rainbow trout fry cultivation proposed in this invention;

[0039] Figure 2 This is a schematic diagram of the independent incubation unit structure of a constant temperature incubation device for rainbow trout fry cultivation proposed in this invention;

[0040] Figure 3 This is a cross-sectional view of an independent incubation unit of a constant-temperature incubation device for rainbow trout fry cultivation proposed in this invention.

[0041] Figure 4 This is a schematic diagram of the water circulation control system of a constant temperature incubation device for rainbow trout fry cultivation proposed in this invention;

[0042] Figure 5 This is a schematic cross-sectional view of the flow equalization plate of a constant temperature incubation device for rainbow trout fry cultivation proposed in this invention.

[0043] Figure 6 This is a cross-sectional view of the filter tank of a constant-temperature incubation device for rainbow trout fry cultivation proposed in this invention.

[0044] In the diagram: 1. External insulated enclosure; 2. Independent incubation unit; 3. Water circulation control system; 4. Main water inlet pipe; 5. Return water pipe; 6. Incubation chamber; 7. Equipment chamber; 8. Circulation pump; 9. Refrigeration and heating module; 10. Ultraviolet sterilizer; 11. Dissolved oxygenation device; 12. Bottom water inlet; 13. Overflow outlet; 14. Outer frame; 15. Inner screen tray; 16. Flow equalization plate; 17. Branch pipes; 18. Conical guide hole; 19. Intelligent temperature controller; 20. Temperature sensor; 21. Filter tank; 22. Filter cotton; 23. Biochemical balls; 24. Titanium tube chiller unit; 25. Heating box. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Example 1, please refer to Figure 1-6 The present invention provides a technical solution: a constant temperature incubation device for rainbow trout fry cultivation, comprising an external heat-insulating box 1, multiple independent incubation units 2, a water circulation control system 3, a main water inlet pipe 4 and a return water pipe 5. The external heat-insulating box 1 is provided with an incubation chamber 6 and an equipment chamber 7. Multiple independent incubation units 2 are stacked inside the incubation chamber 6. The water circulation control system 3 is located inside the equipment chamber 7.

[0050] The walls of the external heat insulation box 1 are made of double-layer stainless steel with a polyurethane foam insulation layer in between. This design can help maintain a constant internal temperature of the external heat insulation box 1. The front of the external heat insulation box 1 is provided with a transparent double-layer hollow glass observation window, which can facilitate observation of the interior of the external heat insulation box 1.

[0051] The water circulation control system 3 includes a circulation pump 8, a cooling and heating module 9, an ultraviolet sterilizer 10, and a dissolved oxygen enrichment device 11. The circulation pump 8, the cooling and heating module 9, the ultraviolet sterilizer 10, and the dissolved oxygen enrichment device 11 are all installed inside the equipment cavity 7. The circulation pump 8 is connected to the bottom water inlet 12 of each independent incubation unit 2 through the main water inlet pipe 4. The cooling and heating module 9 can adjust the temperature of the water flowing into the independent incubation unit 2. The ultraviolet sterilizer 10 can sterilize the water flowing into the independent incubation unit 2. The ultraviolet sterilizer 10 is a 15W ultraviolet sterilization lamp. The dissolved oxygen enrichment device 11 is used to ensure the dissolved oxygen content of the water in the independent incubation unit 2.

[0052] Each independent incubation unit 2 is equipped with an overflow port 13 at the top. The overflow port 13 is connected to the return water pipe 5 and flows back to the input end of the circulation pump 8 to form a closed loop circulation.

[0053] The inner side of the external heat-insulating box 1 is equipped with 5 layers of guide rails from top to bottom. The independent incubation unit 2 adopts a drawer-type structure and is made of ABS material. Each independent incubation unit 2 includes an outer frame 14 and a sliding inner screen tray 15. The bottom of the inner screen tray 15 is a 60-mesh nylon screen. The bottom of the outer frame 14 is equipped with a flow equalization plate 16. Several conical guide holes 18 are evenly distributed on the flow equalization plate 16. The branch pipe 17 of the main water inlet pipe 4 is connected to the bottom of the flow equalization plate 16. The branch pipe 17 of the main water inlet pipe 4 is connected to the interface behind each layer of guide rails. When the inner screen tray 15 is pushed into place, the interface automatically connects to the bottom water inlet 12 through the sealing ring. The water flow discharged from the branch pipe 17 enters the inner side of the outer frame 14. After being decelerated and rectified by the flow equalization plate 16, the water flow passes vertically through the inner screen tray 15 from bottom to top, forming an upward floating flow field.

[0054] The diameter of the tapered guide hole 18 gradually increases from bottom to top, which is used to reduce the inlet flow velocity and increase the uniformity of water flow diffusion.

[0055] The cooling and heating module 9 includes a titanium tube chiller 24 and a heating box 25. Both the titanium tube chiller 24 and the heating box 25 are connected in series at the output end of the circulating pump 8. By setting the titanium tube chiller 24, the water discharged from the circulating pump 8 can be cooled, and by setting the heating box 25, the water discharged from the circulating pump 8 can be heated.

[0056] The cooling and heating module 9 also includes an intelligent temperature controller 19 and temperature sensors 20 distributed in the incubation chamber 6. The intelligent temperature controller 19 is configured to maintain the circulating water temperature between 9°C and 14°C, with a specific water temperature setting of 11.5°C and a control accuracy of ±0.5°C. When the circulating pump 8 is working, the circulating flow rate is controlled to a level that makes the fish eggs tremble gently at the bottom without being stirred up, approximately 0.2-0.5 L / min / independent incubation unit 2.

[0057] The dissolved oxygen aeration device 11 is a Venturi jet or a nanobubble generator, connected in series to the outlet of the circulating pump 8 to ensure that the dissolved oxygen content of the water entering the independent incubation unit 2 is not less than 8 mg / L.

[0058] Tests have shown that, compared to traditional parallel troughs, this device increases the fertilization rate of eggs by about 15% and reduces the incidence of water mold disease by 80%.

[0059] Example 2, including Example 1, and based on Example 1, provides a technical solution: a filter cylinder 21 is fixedly installed inside the equipment cavity 7. The filter cylinder 21 is connected in series between the return water pipe 5 and the input end of the circulation pump 8. An ultraviolet sterilizer 10 is installed inside the filter cylinder 21. The filter cylinder 21 is also equipped with removable and replaceable filter cotton 22 and biochemical balls 23. By setting the filter cotton 22, the water entering the filter cylinder 21 can be filtered. By setting the biochemical balls 23, the water in the filter cylinder 21 can be biochemically treated. By using the ultraviolet sterilizer 10, the water in the filter cylinder 21 can be sterilized, thereby ensuring the cleanliness and hygiene of the water in the entire water circulation control system 3.

[0060] A method for hatching rainbow trout fry using a dedicated constant-temperature hatching device includes the following steps:

[0061] S1, Equipment preparation and water conditioning:

[0062] Connect the constant temperature incubation device to the power supply and water circuit, adjust the flow rate of the circulation pump 8 to keep the water flow rate of each independent incubation unit 2 at 0.2 to 0.5 L / min; stabilize the circulating water temperature within the range of 9°C to 14°C through the cooling and heating module 9, with a control accuracy of ±0.5°C; start the dissolved oxygen aeration device 11 to ensure that the dissolved oxygen content of the water entering each independent incubation unit 2 is not less than 8 mg / L; turn on the ultraviolet sterilizer 10 to continuously sterilize the circulating water.

[0063] S2, Fish egg loading:

[0064] Spread the rainbow trout fertilized eggs evenly on the inner screen tray 15 of each independent incubation unit 2; push the inner screen tray 15 in so that the bottom water inlet 12 is automatically sealed and connected to the branch pipe 17 of the main water inlet pipe 4.

[0065] S3, Incubation Process Management:

[0066] Water flows through the main inlet pipe 4 to the flow equalization plate 16 at the bottom of each independent hatching unit 2. It is then decelerated and flows upward through the conical guide hole 18, forming a vertically upward suspended flow field. This keeps the fish eggs in a slightly tumbling state, preventing them from piling up. The development of the fish eggs is checked regularly through the transparent double-layer hollow glass observation window. Dead or abnormal eggs can be removed at any time by pulling out the corresponding drawer-type independent hatching unit 2. The operation does not interfere with other independent hatching units 2.

[0067] S4, Water Quality Maintenance:

[0068] The circulating water enters the return water pipe 5 through the overflow port 13 at the top of each independent incubation unit 2, flows through the filter tank 21 for physical filtration and biochemical treatment, and then returns to the circulation pump 8 after being sterilized by the ultraviolet sterilizer 10, forming a closed loop circulation; the filter cotton 22 and biochemical balls 23 in the filter tank 21 are cleaned or replaced regularly.

[0069] S5, Hatching and Transfer:

[0070] Once the fish eggs have developed to the eye stage or hatched, the water inlet of the corresponding independent hatching unit 2 is closed, the inner screen tray 15 is pulled out as a whole, and the fry or larvae with yolk sacs are transferred to the subsequent rearing facilities.

[0071] S6, System Cleaning and Disinfection:

[0072] After one batch of hatching is completed, the water in the device is drained, and all independent hatching units 2, filter tanks 21 and pipelines are cleaned and disinfected in preparation for the next use.

[0073] The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments of this disclosure. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0074] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A constant-temperature incubation device specifically for rainbow trout fry rearing, characterized in that, It includes an external heat-insulating box (1), multiple independent incubation units (2), a water circulation control system (3), a main water inlet pipe (4) and a return water pipe (5). The external heat-insulating box (1) is provided with an incubation chamber (6) and an equipment chamber (7). Multiple independent incubation units (2) are stacked inside the incubation chamber (6). The water circulation control system (3) is located inside the equipment chamber (7). The water circulation control system (3) includes a circulation pump (8), a cooling and heating module (9), an ultraviolet sterilizer (10), and a dissolved oxygen enrichment device (11). The circulation pump (8), the cooling and heating module (9), the ultraviolet sterilizer (10), and the dissolved oxygen enrichment device (11) are all installed in the equipment cavity (7). The circulation pump (8) is connected to the bottom inlet (12) of each independent incubation unit (2) through the main water inlet pipe (4). The cooling and heating module (9) can adjust the temperature of the water flowing into the independent incubation unit (2). The ultraviolet sterilizer (10) can sterilize the water flowing into the independent incubation unit (2). The dissolved oxygen enrichment device (11) is used to ensure the dissolved oxygen content of the water in the independent incubation unit (2). Each of the independent incubation units (2) is provided with an overflow port (13) at the top. The overflow port (13) is connected to the return water pipe (5) and flows back to the input end of the circulation pump (8) to form a closed loop circulation. The independent incubation unit (2) adopts a drawer-type structure. Each independent incubation unit (2) includes an outer frame (14) and a sliding inner screen tray (15). The bottom of the outer frame (14) is provided with a flow equalization plate (16). The branch pipe (17) of the main water inlet pipe (4) is connected to the bottom of the flow equalization plate (16), so that the water flows vertically through the inner screen tray (15) from bottom to top, forming an upward floating flow field. Several conical guide holes (18) are evenly distributed on the flow equalization plate (16). The diameter of the conical guide holes (18) gradually increases from bottom to top, which is used to reduce the inlet flow velocity and increase the uniformity of water flow diffusion.

2. The constant temperature incubation device for rainbow trout fry rearing according to claim 1, characterized in that: The cooling and heating module (9) includes a titanium tube chiller (24) and a heating box (25), both of which are connected in series to the output end of the circulating pump (8).

3. The constant temperature incubation device for rainbow trout fry rearing according to claim 1, characterized in that: The cooling and heating module (9) also includes an intelligent temperature controller (19) and temperature sensors (20) distributed in the incubation chamber (6). The intelligent temperature controller (19) is configured to maintain the circulating water temperature between 9°C and 14°C with a control accuracy of ±0.5°C.

4. The constant temperature incubation device for rainbow trout fry rearing according to claim 1, characterized in that: The dissolved oxygen enrichment device (11) is a Venturi jet or a nano bubble generator, connected in series to the outlet of the circulating pump (8) to ensure that the dissolved oxygen content of the water entering the independent incubation unit (2) is not less than 8 mg / L.

5. The constant temperature incubation device for rainbow trout fry rearing according to claim 1, characterized in that: A filter cylinder (21) is also fixedly installed inside the equipment cavity (7). The filter cylinder (21) is connected in series between the return water pipe (5) and the input end of the circulation pump (8). The ultraviolet sterilizer (10) is installed inside the filter cylinder (21). The filter cylinder (21) is also equipped with a removable and replaceable filter cotton (22) and biochemical balls (23).

6. The constant temperature incubation device for rainbow trout fry rearing according to claim 1, characterized in that: The wall of the external heat insulation box (1) is made of double-layer stainless steel structure, with polyurethane foam insulation layer in the middle, and the front of the external heat insulation box (1) is provided with a transparent double-layer hollow glass observation window.

7. A method for hatching rainbow trout fry using a constant-temperature incubation device according to any one of claims 1-6, characterized in that, Includes the following steps: S1, Equipment preparation and water conditioning: Start the water circulation control system (3), adjust the flow rate of the circulation pump (8) to keep the water flow rate of each independent incubation unit (2) at 0.2 to 0.5 L / min; stabilize the circulating water temperature in the range of 9°C to 14°C through the cooling and heating module (9), with a control accuracy of ±0.5°C; start the dissolved oxygen aeration device (11) to ensure that the dissolved oxygen content of the water entering each independent incubation unit (2) is not less than 8 mg / L; turn on the ultraviolet sterilizer (10) to continuously sterilize the circulating water; S2, Fish egg loading: Spread the rainbow trout fertilized eggs evenly on the inner screen tray (15) of each independent incubation unit (2); push the inner screen tray (15) in so that the bottom water inlet (12) is automatically sealed and connected to the branch pipe (17) of the main water inlet pipe (4); S3, Incubation Process Management: Water flows through the main inlet pipe (4) to the flow equalization plate (16) at the bottom of each independent hatching unit (2). It is decelerated and flows upward through the conical guide hole (18) to form a vertically upward suspended flow field, so that the fish eggs are in a slightly tumbling state and avoid stacking. The development of the fish eggs is checked regularly through the transparent double-layer hollow glass observation window, and dead or abnormal eggs are removed at any time by pulling out the corresponding drawer-type independent hatching unit (2). The operation does not interfere with other independent hatching units (2). S4, Water Quality Maintenance: The circulating water enters the return water pipeline (5) through the overflow port (13) at the top of each independent incubation unit (2), flows through the filter tank (21) for physical filtration and biochemical treatment, and then returns to the circulation pump (8) after being sterilized by the ultraviolet sterilizer (10), forming a closed loop circulation; the filter cotton (22) and biochemical balls (23) in the filter tank (21) are cleaned or replaced regularly. S5, Hatching and Transfer: After the fish eggs develop to the eye stage or hatch, the water inlet of the corresponding independent incubation unit (2) is closed, the inner screen tray (15) is pulled out as a whole, and the fry or larvae with yolk sacs are transferred to the subsequent cultivation facilities. S6, System Cleaning and Disinfection: After a batch of hatching is completed, the water in the device is drained, and all independent hatching units (2), filter tanks (21) and pipelines are cleaned and disinfected for the next use.

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