An incubator for incubating eggs of a species of fish of the genus Labidesthes and a method of incubating eggs of a species of fish of the genus Lab

Abstract

The application discloses a device and a method for hatching eggs of a fish of a species of a genus of a fish, and the device comprises a plurality of supports, a plurality of support plates arranged on the supports, a plurality of hatching boxes arranged on the support plates, a hatching frame arranged in each hatching box, a screen arranged at a lower portion of the hatching frame, a water outlet hole arranged on a side wall of each hatching box, a filter cover arranged in each hatching box and covering the water outlet hole, and an overflow pipe inserted into the water outlet hole and capable of rotating. The device further comprises a water supply pump and an oxygenation pump. The device can simulate a natural environment for hatching the eggs of the fish of the species of the genus of the fish, thereby providing a hatching rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, more particularly, to a device and method for hatching eggs of Onychostoma lini. BACKGROUND

[0002] Onychostoma lini, commonly known as freshwater stonefish, is mainly distributed in Zhejiang, Anhui, Jiangxi and Fujian, etc., and lives in the rapid current environment of mountain stream and upper reaches of rivers. The breeding season is generally from May to July. In the traditional artificial breeding of Onychostoma lini, the hatching of fish eggs is mostly carried out by using the conventional hatching method of fish, i.e. hatching barrel flow water aeration hatching or ring flow water hatching. However, the above hatching methods generally have a low hatching rate. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a device and method for hatching eggs of Onychostoma lini.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The present application discloses a device for hatching eggs of Onychostoma lini, comprising a plurality of supports, a plurality of support plates arranged on the supports, a plurality of hatching boxes arranged on the support plates, a hatching frame arranged in each hatching box, a screen arranged at the lower part of the hatching frame, a water outlet hole formed in the side wall of each hatching box, a filter cover installed in each hatching box and covering the water outlet hole, and an overflow pipe inserted in the water outlet hole and rotatable. The device further comprises a water supply pump, a water supply main pipe connected to the outlet of the water supply pump, a plurality of water supply branch pipes connected to the side surface of the water supply main pipe, a plurality of water inlet pipes connected to the water supply branch pipes, the water inlet pipes being arranged corresponding to the hatching boxes, an oxygenation pump, a gas supply main pipe connected to the oxygenation pump, and a plurality of gas supply branch pipes connected to the gas supply main pipe and arranged corresponding to the positions of the hatching boxes.

[0006] Further, a sealing sleeve is installed in the water outlet hole, and the overflow pipe is rotatably arranged in the sealing sleeve.

[0007] Further, a drainage groove is connected to each support plate, and a drainage hole is formed in the middle position of each drainage groove.

[0008] Further, the outlet of the overflow pipe is located within the range of the drainage groove.

[0009] Further, a water falling pipe is arranged at the lower part of each drainage groove, and the upper end of the water falling pipe is in communication with the drainage hole.

[0010] Further, the mesh number of the screen is 18-30.

[0011] Further, a sewage pipe is connected to the end of each water supply branch pipe away from the water supply main pipe.

[0012] Further, the incubator is a cuboid with a size of 575mmx390mmx250mm; and the incubation frame is a cuboid with a size of 540mmx380mmx50mm.

[0013] A method for incubating fish eggs, comprising the following steps:

[0014] The incubator is placed on the support plate in sequence, the overflow pipe is in a vertical state, water is injected into the incubator through the water inlet pipe, after water flows out from the overflow pipe, the water flow rate of the water inlet pipe is reduced, the water temperature is 23-26℃, and the flow rate is controlled at 25 liters per 24 hours.

[0015] The incubation frame covered with fish eggs is placed in the incubator, the incubation frame floats in the water in the incubator, and the screen is 3-4cm away from the water surface.

[0016] The end of the air supply branch pipe is placed in the incubator, and the water body in the incubator is continuously oxygenated through the air supply branch pipe.

[0017] After 72 hours, the incubation frame is taken out of the incubator, and the unincubated fish eggs on the screen are removed.

[0018] After another 144 hours, the overflow pipe is rotated to be in a horizontal state, the water level in the incubator is lowered, the water and fry in the incubator are poured into the transfer box, and the fry is transferred to the rearing pond.

[0019] The beneficial effects of the present application are: by continuously providing water to simulate the flowing water in nature, thereby simulating the natural environment of the actual incubation of the golden carp fish eggs, and thereby improving the incubation rate; at the same time, the constant temperature of the water body is ensured to provide suitable external conditions for the incubation of the fish eggs, and the incubation rate of the fish eggs is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the golden carp fish egg incubation device in the embodiment;

[0021] Figure 2 It is a top view of the golden carp fish egg incubation device in the embodiment;

[0022] Figure 3 It is a sectional view of the incubator in the embodiment;

[0023] Figure 4 It is a partial structure schematic view of the golden carp fish egg incubation device in the embodiment;

[0024] Figure 5 It is Figure 4 It is an enlarged schematic view of A in the embodiment;

[0025] Figure 6 It is a use state schematic view of the incubator in the embodiment;

[0026] Figure 7 For Figure 6 enlarged view of A in the middle;

[0027] Figure 8 is the placement state diagram of the incubator in this embodiment.

[0028] Reference signs: 1, support; 2, support plate; 3, incubator; 4, drainage groove; 5, water supply pump; 6, water supply main pipe; 7, water supply branch pipe; 8, water inlet pipe; 9, regulating valve; 10, sewage pipe; 11, incubation frame; 12, screen; 13, water outlet hole; 14, sealing sleeve; 15, overflow pipe; 16, filter cover; 17, drainage hole; 18, oxygenation pump; 19, air supply main pipe; 20, air supply branch pipe; 21, downspout; 22, guide block; 23, limit block; 24, trigger three; 25, adjusting gear; 26, trigger lever; 27, contact sensor one; 28, contact sensor two; 29, lifting groove; 30, trigger one; 31, trigger two; 32, lead screw; 33, lifting plate; 34, support frame; 35, drive gear; 36, drive motor; 37, lead screw motor. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0030] As Figures 1-3 shown, a kind of Osteochilus fish egg incubator, including installation in thermostat room several supports 1, support 1 is provided with several support plates 2, several support plates 2 are evenly distributed from top to bottom on support 1, support plate 2 is provided with several incubators 3, support plate 2 is evenly distributed along the length direction of support plate 2, incubator 3 is provided with incubation frame 11, incubation frame 11 lower part is provided with screen 12, incubation frame 11 floats in the water in incubator 3, screen 12 is located 3-4cm below water surface, so that fish egg laid on screen can contact with water.The mesh number of screen 12 is 18-30 mesh, preferably 20 mesh, so that fish egg is greater than the size of hole on screen 12, fish egg cannot pass through the hole on screen 12.After fish egg incubation, the size of hatched fry is less than the size of hole on screen 12, and the fry can pass through the hole.

[0031] As Figure 3 shown, the side wall of incubator 3 is provided with water outlet hole 13, and filter cover 16 is installed in incubator 3, filter cover 16 covers water outlet hole 13, and filter cover 16 can prevent fry from running out of water outlet hole 13 with flowing water.

[0032] A sealing sleeve 14 is arranged in the water outlet hole 13, and an overflow pipe 15 is rotatably arranged in the sealing sleeve 14. The overflow pipe 15 has an L-shaped structure, and one end of the horizontal section of the overflow pipe 15 extends into the filter cover 16.

[0033] As shown in Figure 2 The light-lipped fish egg hatching device further comprises a water supply pump 5 and an oxygenation pump 18. The outlet of the water supply pump 5 is connected with a water supply main pipe 6. A plurality of water supply branch pipes 7 are connected with the side of the water supply main pipe 6. The water supply branch pipes 7 are located above the corresponding support plates 2. A plurality of water inlet pipes 8 are connected with the water supply branch pipes 7. The water inlet pipes 8 are provided with filter screens at the connection positions with the water supply branch pipes 7, so that the particulate impurities in the water can be reduced to avoid entering the hatching boxes 3 through the water inlet pipes 8 and affecting the water quality.

[0034] The water inlet pipes 8 are arranged corresponding to the hatching boxes 3. The outlets of the water inlet pipes 8 are located above the hatching boxes 3. The water inlet pipes 8 are provided with adjusting valves 9. The flow of the water entering the hatching boxes 3 through the water inlet pipes 8 can be adjusted through the adjusting valves 9.

[0035] The oxygenation pump 18 is connected with a gas supply main pipe 19. A plurality of gas supply branch pipes 20 are connected with the gas supply main pipe 19. The gas supply branch pipes 20 are arranged corresponding to the positions of the hatching boxes 3. The other ends of the gas supply branch pipes 20 are arranged in the hatching boxes 3 and are connected with aeration heads. The oxygenation pump 18 supplies gas to the water in the hatching boxes 3 through the gas supply branch pipes 20 to achieve the purpose of oxygenation.

[0036] Further, the support plates 2 are connected with drainage channels 4. The drainage channels 4 are provided with drainage holes 17 at the middle positions. The outlets of the overflow pipes 15 are located in the range of the drainage channels 4. The bottom surfaces of the drainage channels 4 are designed to be high at both sides and low in the middle, so that the water overflowing from the overflow pipes 15 into the drainage channels 4 can flow to the middle drainage holes 17 and be discharged.

[0037] Further, the drainage channels 4 are provided with downpipes 21 at the lower parts. The upper ends of the downpipes 21 are in communication with the drainage holes 17. The lower ends of the downpipes 21 located above extend into the drainage channels 4 located below. The lower ends of the downpipes 21 are located at a distance from the drainage holes 17 of the drainage channels 4 located below. The water in the drainage channels 4 located above flows to the drainage channels 4 located below through the drainage holes 17 and the downpipes 21, and then is discharged together with the water in the drainage channels 4 located below.

[0038] Further, the water supply branch pipes 7 are connected with sewage pipes 10 at the ends away from the water supply main pipe 6. The lower ends of the sewage pipes 10 are threadedly connected with sealing covers. The impurities in the water supply branch pipes 7 will flow into the sewage pipes 10 along with the water, and then accumulate at the bottom of the sewage pipes 10. The sealing covers are opened regularly to discharge the impurities.

[0039] Furthermore, the incubator 3 is a cuboid with dimensions of 575mm×390mm×250mm and is made of plastic; the incubation frame 11 is a cuboid with dimensions of 540mm×380mm×50mm and is made of wood.

[0040] like Figures 4-8 As shown, a limiting block 23 and an inlet block 22 are provided on the upper part of the support plate 2, with the inlet block 22 and the limiting block 23 positioned correspondingly front to back. An inlet block 22 and a limiting block 23 are provided on each of the left and right sides of the incubator 3. A trigger 1 30 is provided on the limiting block 23, a trigger 2 31 is provided on the support plate 2 in front of the limiting block 23, and a trigger 3 24 is provided on the support plate 2 at a forward position. The specific position of the trigger 3 24 is such that when the incubator 3 is placed flat on the support plate 2 and its rear side abuts against the limiting block 23, the incubator 3 cannot press against the trigger 3 24.

[0041] An adjusting gear 25 is installed on the overflow pipe 15. A lifting groove 29 is provided on the support plate 2 corresponding to the position below the adjusting gear 25. A lead screw motor 37 is installed in the lifting groove 29, and the lead screw motor 37 drives and connects to a lead screw 32, which is vertically arranged. A lifting plate 33 is installed on the lead screw 32, and a support frame 34 is connected to the upper part of the lifting plate 33. A drive gear 35 is rotatably mounted on the support frame 34. A drive motor 36 is installed on the lifting plate 33, and the drive motor 36 is connected to the drive gear 35 via belt drive. Specifically, the drive motor 36 drives and connects to a reducer, the reducer drives and connects to a drive gear, the drive gear 35 is coaxially connected to a driven gear, and a synchronous belt connects the drive gear and the driven gear.

[0042] A trigger rod 26 is connected to the side of the adjusting gear 25 near the incubator 3. Contact sensor 1 27 and contact sensor 28 are located on the front side of the incubator 3. When the overflow pipe 15 is rotated to the vertical position, the overflow port of the overflow pipe 15 is at the top, and the trigger rod 26 contacts contact sensor 1 27. When the overflow pipe 15 is rotated to the horizontal position, the overflow port of the overflow pipe 15 is flush with the water outlet 13, and the trigger rod 26 contacts contact sensor 28. Trigger 1 30, trigger 2 31, trigger 3 24, contact sensor 1 27, and contact sensor 28 are connected to the drive motor 36 and the lead screw motor 37.

[0043] In the initial state, the lifting plate 33 is located at the bottom of the lifting groove 29, so that the drive gear 35 is located within the lifting groove 29 and will not affect the placement of the incubator 3 onto the support plate 2. Figure 6As shown, when placing the incubators 3, first tilt the incubators 3 so that the front end of the incubators 3 is higher than the rear end of the incubators 3, and then place the rear end of the incubators 3 on the support plate 2 at a position behind the trigger three 24. Push the incubators 3 while keeping them in the tilted state, so that the incubators 3 do not come into contact with the trigger three 24, and the trigger three 24 does not send a signal. The guide block 22 can guide the movement of the incubators 3 so that the incubators 3 reach the designated position without deviation.

[0044] After the rear side of the tilted incubators 3 hits the top of the limiting block 23, place the incubators 3 flat and make them abut against the limiting block 23, at which time the trigger one 30 and the trigger two 31 are triggered simultaneously. The trigger one 30 and the trigger two 31 send signals to the lead screw motor 37 and the drive motor 36. The lead screw motor 37 drives the lead screw 32 to rotate, causing the lifting plate 33 to rise, and the drive gear 35 on the lifting plate 33 to move upward and engage with the adjusting gear 25. The drive motor 36 drives the drive gear 35 to rotate, in turn driving the overflow pipe 15 to rotate, so that the overflow pipe 15 rotates to the vertical state. At this time, water is added to the incubators 3 through the water inlet pipe 8, so that the water level in the incubators 3 reaches the designated height.

[0045] When the overflow pipe 15 rotates to the vertical state, the trigger lever 26 comes into contact with the contact sensor one 27, the contact sensor one 27 sends a signal, causing the drive motor 36 to stop running. The lead screw motor 37 can not run, so that the drive gear 35 remains engaged with the adjusting gear 25; or the lead screw motor 37 can drive the lead screw 32 to rotate, so that the lifting plate 33 drives the drive gear 35 back into the lifting groove 29.

[0046] Because the tilted incubators 3 move, they will come into contact with the trigger one 30 or the trigger two 31 before reaching the designated position. If only the trigger one 30 or the trigger two 31 is provided, it will send a signal when the incubators 3 are in the wrong position, causing the equipment to malfunction. By providing the trigger one 30 and the trigger two 31, the trigger one 30 and the trigger two 31 are triggered simultaneously when the incubators 3 reach the designated position, at which time the signal is sent to enable the equipment to operate normally.

[0047] Before transporting the fry, because there is a lot of water in the incubators 3, a portion of the water needs to be drained to facilitate the removal of the incubators 3 from the support plate 2. One way is for the staff to rotate the overflow pipes 15 on each of the incubators 3 from right to left to the horizontal state one by one. After completing the adjustment of the overflow pipe 15 on the leftmost incubator 3, return to the rightmost incubator 3. At this time, most of the water in the incubator 3 flows out, and the overall weight of the incubator 3 is reduced. The staff can conveniently remove the incubators 3 from the support plate 2.

[0048] Since the overflow pipe 15 is directly rotated from the vertical state to the horizontal state, the water in the incubator 3 flows out quickly, and the high flow rate can cause the fish larvae to flow with the water, which can hit the inner wall of the incubator 3 or the filter cover 16, or collide with each other, affecting the fish larvae.

[0049] In order to reduce the impact of water drainage on the fish larvae in the incubator 3, it is necessary to make the water in the incubator 3 overflow slowly. Before transportation, the incubator 3 is pulled forward by a certain distance, so that the incubator 3 presses the trigger three 24, and the trigger three 24 is pressed to send a signal. If the front drive gear 35 maintains the engagement state of the adjusting gear 25, after the trigger three 24 sends a signal, the drive motor 36 drives the drive gear 35 to rotate in the opposite direction, so that the overflow pipe 15 slowly rotates to the horizontal state. If the front lifting plate 33 drives the drive gear 35 to return to the lifting groove 29, after the trigger three 24 sends a signal, the lead screw motor 37 drives the lead screw 32 to rotate, so that the lifting plate 33 drives the drive gear 35 to rise to the engagement state of the drive gear 35 and the adjusting gear 25, and then the drive motor 36 drives the drive gear 35 to rotate in the opposite direction, so that the overflow pipe 15 slowly rotates to the horizontal state. Since the overflow pipe 15 changes to the horizontal state at a slower speed, the water in the incubator 3 can slowly flow out, so as to reduce the impact of water drainage on the fish larvae in the incubator 3.

[0050] After the overflow pipe 15 is rotated to the horizontal state, the trigger rod 26 contacts the contact sensor two 28, the contact sensor two 28 sends a signal, the lead screw motor 37 drives the lifting plate 33 to descend, and the drive gear 35 returns to the support plate 2. After the incubator 3 is removed from the support plate 2, no interference is caused.

[0051] A method for incubating fish eggs, comprising the following steps:

[0052] The fish egg incubation device is arranged in a constant temperature room, and the temperature is maintained at 23-26°C, preferably 25°C.

[0053] The incubator 3 is placed on the support plate 2 in turn, the overflow pipe 15 is in the vertical state, water is injected into the incubator 3 through the water inlet pipe 8, after water flows out from the overflow pipe 15, the water flow rate of the water inlet pipe 8 is reduced, the water temperature is 23-26°C, preferably 25°C, and the water flow rate is controlled at 25 liters per 24 hours.

[0054] The incubation frame 11 covered with fish eggs is placed in the incubator 3, the incubation frame 11 floats in the water in the incubator 3, and the screen 12 is located 3-4 cm below the water surface, so that the fish eggs can fully contact with the water; a gap is left between the incubation frame 11 and the inner wall of the incubator 3, so that the incubation frame 11 can be in a floating state in the incubator 3, which is helpful for the flow of water in the incubator 3, and can simulate the water flow state of the wild environment.

[0055] The end of the air supply branch pipe 20 is put into the incubator 3, and the water body in the incubator 3 is continuously oxygenated through the air supply branch pipe 20.

[0056] The fish eggs are generally hatched in about 48 hours, and the size of the fry after hatching is smaller than that of the fish eggs, which can reach the lower part of the incubation frame 11 through the mesh on the screen 12, so that the fry can have more living space.

[0057] After 72 hours, the fish eggs left on the screen 12 generally cannot be hatched any more, and these fish eggs left in the incubator 3 may rot and affect the water quality, and then affect the survival of the fry. The incubation frame 11 is taken out of the incubator 3, and the unhatched fish eggs on the screen 12 are removed.

[0058] The cleaned incubation frame 11 is stored and waits for the next use.

[0059] After another 144 hours, the overflow pipe 15 is rotated to be horizontal, so that the water level in the incubator 3 is lowered to the lower end of the water outlet hole 13, thereby reducing the water volume in the incubator 3 and reducing the overall weight of the incubator 3, which facilitates the removal of the incubator 3 from the support plate 2. The water and fry in the incubator 3 are poured into the transfer box, and then the fry are transferred to the rearing pond.

[0060] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A device for incubating eggs of the bryophyll carp, characterized in that, The system includes several supports (1), several support plates (2) on the supports (1), several incubators (3) on the support plates (2), an incubation frame (11) inside the incubator (3), a screen (12) at the bottom of the incubation frame (11), a water outlet (13) on the side wall of the incubator (3), a filter cover (16) installed inside the incubator (3) covering the water outlet (13), an overflow pipe (15) inserted into the water outlet (13), and the overflow pipe (15) being rotatable; it also includes a water supply pump (5) and an oxygenation pump (18), the water supply pump (5) The outlet is connected to a main water supply pipe (6), and several water supply branch pipes (7) are connected to the side of the main water supply pipe (6). Several water inlet pipes (8) are connected to the water supply branch pipes (7), and the water inlet pipes (8) are set corresponding to the incubator (3). The oxygen pump (18) is connected to a main air supply pipe (19), and several air supply branch pipes (20) are connected to the main air supply pipe (19), and the air supply branch pipes (20) are set corresponding to the position of the incubator (3). A limit block (23) and an inlet block (22) are set on the upper part of the support plate (2). A trigger (30) is set on the limit block (23). The support plate (2) is located at the limit block (23). 3) A trigger 2 (31) is provided at the front side. An adjusting gear (25) is installed on the overflow pipe (15). A lifting groove (29) is provided on the support plate (2) corresponding to the position below the adjusting gear (25). A lead screw motor (37) is provided in the lifting groove (29). The lead screw motor (37) drives and connects to a lead screw (32). A lifting plate (33) is installed on the lead screw (32). A support frame (34) is connected to the upper part of the lifting plate (33). A drive gear (35) is rotatably provided on the support frame (34). A drive motor (36) is provided on the lifting plate (33). 6) The incubator (3) is connected to the drive gear (35) via belt drive; the incubator (3) is laid flat, and the trigger one (30) and trigger two (31) are triggered simultaneously. The trigger one (30) and trigger two (31) send signals to the lead screw motor (37) and the drive motor (36). The lead screw motor (37) drives the lead screw (32) to rotate, so that the lifting plate (33) rises. The drive gear (35) on the lifting plate (33) moves upward and meshes with the adjusting gear (25). The drive motor (36) drives the drive gear (35) to rotate, which in turn drives the overflow pipe (15) to rotate, so that the overflow pipe (15) rotates to a vertical state.

2. The incubation device for *Gymnocypris chinensis* eggs according to claim 1, characterized in that, A sealing sleeve (14) is installed inside the water outlet (13), and the overflow pipe (15) is rotatably disposed inside the sealing sleeve (14).

3. The incubation device for *Gymnocypris chinensis* eggs according to claim 1, characterized in that, The support plate (2) is connected to a drainage groove (4), and a drainage hole (17) is provided in the middle of the drainage groove (4).

4. The incubation device for *Gymnocypris chinensis* eggs according to claim 3, characterized in that, The outlet of the overflow pipe (15) is located within the area of ​​the drainage trough (4).

5. The incubation device for *Gymnocypris chinensis* eggs according to claim 3, characterized in that, The lower part of the drainage trough (4) is provided with a downpipe (21), and the upper end of the downpipe (21) is connected to the drainage hole (17).

6. The incubation device for *Gymnocypris chinensis* eggs according to claim 1, characterized in that, The mesh size of the sieve (12) is 18-30 mesh.

7. The incubation device for *Scleroderma fasciatus* eggs according to claim 1, characterized in that, The end of the water supply branch pipe (7) that is away from the main water supply pipe (6) is connected to a sewage pipe (10).

8. The incubation device for *Gymnocypris chinensis* eggs according to claim 1, characterized in that, The incubation box (3) is a cuboid with dimensions of 575mm×390mm×250mm; the incubation frame (11) is a cuboid with dimensions of 540mm×380mm×50mm.

9. A method for hatching fish eggs using the fish egg hatching device for *Gymnocypris chinensis* according to any one of claims 1-8, characterized in that, Includes the following steps: S1. The incubator (3) is placed on the support plate (2) in sequence. The overflow pipe (15) is in a vertical position. Water is injected into the incubator (3) through the water inlet pipe (8). After water flows out from the overflow pipe (15), the outflow rate of the water inlet pipe (8) is reduced. The water temperature is 23-26℃. The flow rate is controlled at 25 liters per 24 hours. S2. Place the hatching frame (11) filled with fish eggs into the hatching box (3). The hatching frame (11) floats in the water in the hatching box (3). The sieve (12) is 3-4 cm away from the water surface. S3. The end of the air supply branch pipe (20) is placed into the incubator (3) and oxygen is continuously supplied to the water in the incubator (3) through the air supply branch pipe (20). S4. After 72 hours, remove the hatching frame (11) from the hatching box (3) and remove the unhatched fish eggs from the sieve (12); S5. After another 144 hours, rotate the overflow pipe (15) to make the overflow pipe (15) horizontal, the water level in the hatching box (3) drops, pour the water and fish fry in the hatching box (3) into the transfer box, and transfer the fish fry to the rearing pond.

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