A device and method for hatching of sea bass fry

Abstract

The application discloses a kind of sea bass fry hatching equipment and hatching method, it is related to sea bass hatching aquaculture technical field.A kind of sea bass fry hatching equipment, it includes hatching pool, height adjustment component and multiple fish egg nests, height adjustment component is set in hatching pool;Height adjustment component includes connecting ring, height adjustment ring and multiple first rotary rods, height adjustment ring is set in the inside of connecting ring, first rotary rod is vertically in hatching pool, and first rotary rod is connected with height adjustment ring;Multiple fish egg nests are spaced apart on height adjustment ring, and the bottom of hatching pool is provided with heating assembly.The application can be adjusted according to different sinking depth by the matching use of height adjustment ring and first rotary rod, so that the sinking depth of fish egg nest inside hatching pool.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sea bass hatching culture, in particular to a sea bass fry hatching device and a hatching method. BACKGROUND

[0002] The sea bass is one of the four major freshwater fish in China, and the body of the sea bass is laterally compressed, the lower jaw is longer than the upper jaw, the meat is firm and in the shape of garlic cloves, and the sea bass grows and fattens in freshwater, inhabits the bottom layer of clear flowing water, hides during the day and moves at night, feeds on shrimps and small fish, and is more common in the Yellow Sea and the Bohai Sea. The sea bass is favored by people in recent years because of its delicious taste and crisp meat, and has become one of the famous dishes in the catering industry. Due to the high demand for sea bass in the market, the prospect of sea bass culture is good. The culture process of sea bass includes the early-stage fry breeding and hatching, the late-stage fry breeding, and the culture of adult fish. Because the survival rate of natural reproduction of sea bass is low, the sea bass fry is generally hatched artificially. In the hatching process, palm tree leaves are used as fish nests, which are arranged at a water depth of 30-40 cm on the bank of the spawning pond for sea bass to lay eggs. Then the fish eggs are collected and transplanted into a special hatching device for hatching. The existing fry cannot conveniently adjust the sinking depth of the fish nest with fish eggs attached due to the different temperatures of the water layers, which cannot meet the use requirements. In addition, the internal water temperature of the existing fry hatching tank is not balanced, the temperature of different water layers is different, which affects the hatching of the fry. After the fry hatches out of the shell, the fry in the hatching tank needs to be captured and transferred. However, because the fry is small and the hatching tank is deep, it is not convenient to capture the fry, and the phenomenon of missing fry is likely to occur. SUMMARY

[0003] The present application aims to provide a sea bass fry hatching device and a hatching method to solve the problem that the existing sea bass culture method cannot conveniently adjust the sinking depth of the fish nest with fish eggs attached due to the different temperatures of the water layers.

[0004] The technical solution of the present application to solve the above technical problems is as follows:

[0005] A sea bass fry hatching device, comprising a hatching tank, a height adjusting assembly, and a plurality of fish egg nests, wherein the height adjusting assembly is arranged in the hatching tank; the height adjusting assembly comprises a connecting ring, a height adjusting ring, and a plurality of first rotating rods, the connecting ring is arranged at the top of the hatching tank, the height adjusting ring is arranged on the inner side of the connecting ring, the plurality of first rotating rods are arranged along the circumference of the connecting ring, the first rotating rods are vertically arranged in the hatching tank, and the first rotating rods are connected with the height adjusting ring; the plurality of fish egg nests are arranged on the height adjusting ring in a spaced manner, and the bottom of the hatching tank is provided with a heating assembly.

[0006] The beneficial effects of the above technical solution are as follows: Multiple fish ovaries are sequentially installed on the height adjustment ring. Rotating the first rotating rod lowers the connecting ring, adjusting the height at which the fish ovaries sink into the hatching tank. The heating component is activated, placing the height adjustment ring in a suitable water temperature layer, and then the fish fry are allowed to hatch. Rotating the first rotating rod again causes the fish ovaries to extend beyond the water temperature layer, allowing them to be removed from the height adjustment ring and the fish fry to be retrieved from the hatching tank. The heating component in this technical solution ensures a uniform water temperature within the hatching tank, preventing temperature differences between different water layers and meeting the environmental conditions for fry hatching. The matching use of the height adjustment ring and the first rotating rod allows for adjustment of the height adjustment ring according to different submersion depths, ensuring the submersion depth of the fish ovaries meets hatching requirements. This avoids large day-night temperature differences and variations in water temperature between the surface and bottom, which can affect fry hatching. This solves the problem of existing bass farming methods that cannot easily adjust the submersion depth of the fish ovaries attached with eggs according to different water temperatures.

[0007] Furthermore, the heating assembly includes a heating bottom shell, a heating plate, and multiple spaced water supply columns. The heating bottom shell is connected to the bottom of the incubation pool to form a heating chamber, and the heating plate is set on the heating bottom shell. The water supply columns are vertically set on the outer wall of the incubation pool, and the bottom end of the water supply columns is connected to the heating chamber. The side wall of the incubation pool is provided with a water inlet connected to the water supply columns.

[0008] The beneficial effects of adopting the above technical solution are as follows: based on the structure of the hatching pool, the heating components can be set to maintain a balanced water temperature inside the hatching pool, thereby improving the survival rate of fish fry.

[0009] Furthermore, the height adjustment assembly also includes multiple second rotating rods. A fishing lifting plate is provided at the bottom of the hatching pool. The multiple second rotating rods are arranged along the circumference of the connecting ring. The top of the second rotating rod is rotatably engaged with the height adjustment ring, and the bottom of the second rotating rod is threadedly connected to the fishing lifting plate. The top of the first rotating rod is threadedly connected to the height adjustment ring, and the bottom of the first rotating rod is rotatably engaged with the fishing lifting plate.

[0010] Furthermore, the fishing lifting plate includes a lifting frame, a filter screen, and a central ring. The edge of the lifting frame is provided with a first threaded hole and a first sliding hole for connecting the first rotating rod and the second rotating rod, respectively. The central ring is located in the middle of the lifting frame, and the filter screen is laid between the central ring and the lifting frame.

[0011] Furthermore, the fishing lifting plate also includes multiple support rods, one end of which is connected to the central ring, and the other end of which is connected to the lifting frame.

[0012] The beneficial effects of the above technical scheme are that: after the fish fry hatches and breaks the shell, the fry needs to be transferred to the feeding pool. Since the water inside the hatching pool is relatively deep and the fry is small, it is inconvenient to catch the fry. The fish catching lifting disc is gradually raised by rotating the second rotating rod. Since the filter screen is arranged, the born fry can be collected to the water surface, which is convenient for the operator to catch the fry, improves the convenience of catching, and reduces the occurrence of the problem of missing fry.

[0013] Further, the connecting ring comprises a sleeve ring and a plurality of connecting blocks arranged inside the sleeve ring, the sleeve ring is embedded in the hatching pool, and the height adjusting ring comprises a lifting ring and a plurality of flange blocks arranged outside the lifting ring, one flange block is overlapped with one connecting block.

[0014] Further, a water outlet pipe is vertically arranged in the middle of the hatching pool, and a detection assembly for detecting water quality is arranged on the outer wall of the water outlet pipe.

[0015] Further, the top end of the water outlet pipe is provided with an oxygen generating device, and the oxygen generating device comprises an oxygenator, an oxygen supply pipe and a sand head, the oxygenator is arranged at the top end of the water outlet pipe, one end of the oxygen supply pipe is connected with the oxygenator, and the other end of the oxygen supply pipe is connected with the sand head.

[0016] The beneficial effects of the above technical scheme are that: the water outlet pipe arranged in the center of the hatching pool is used for the circulation of the water in the pool, to ensure that the water quality inside the hatching pool is good. Through the arrangement of the detection assembly, the water quality inside the hatching pool can be detected, and the water quality data can be obtained in real time, to ensure that the water quality inside the hatching pool meets the hatching use of the perch fry.

[0017] Further, the fish egg nest comprises a plug-in frame, a plug-in slot, a plug-in column and a sun cover, the sun cover is embedded in the plug-in frame, the top of the plug-in frame is provided with the plug-in slot, and the side wall of the plug-in frame is provided with the plug-in column connected with the height lifting ring.

[0018] A hatching method of a perch fry hatching device comprises the following steps:

[0019] S1: a plurality of fish egg nests are sequentially installed on the height adjusting ring;

[0020] S2: the first rotating rod is rotated, and the height adjusting ring is lowered below the water surface in the hatching pool along the first rotating rod;

[0021] S3: the heating assembly is started, the position of the fish egg nest in the water temperature water layer is adjusted by rotating the first rotating rod again according to the water temperature in the hatching pool, and the fish fry on the fish egg nest is waited to hatch out of the shell;

[0022] S4: after the fish fry hatches out, the first rotating rod is rotated, and the fish egg nest is stretched out of the water temperature water layer;

[0023] S5: the fish egg nest is detached from the height adjusting ring, and the fish fry in the hatching pool is fished.

[0024] The present application has the following beneficial effects:

[0025] (1) The over-heating assembly can make the water temperature in the incubation pool balanced, so that the water temperature of different water layers is not different, and the environmental conditions for the hatching of fish fry are met. The height adjusting ring and the first rotating rod are matched, and the height adjusting ring can be adjusted according to different sinking depths, so that the sinking depth of the fish egg nest in the incubation pool meets the use requirements of hatching, and the large diurnal temperature difference, the different water temperatures of the water surface and the water bottom, and the influence on the hatching of fish fry are avoided.

[0026] (2) The second rotating rod is rotated, and the fish catching lifting disc is gradually raised. Due to the setting of the filter screen, the born fish fry can be collected to the water surface, so that the operation personnel can catch the seedlings, improve the convenience of catching, and reduce the occurrence of the problem of missing seedlings.

[0027] (3) The water outlet pipe arranged at the center of the incubation pool is used for circulating the water in the pool, so that the water quality in the incubation pool is ensured to be good. The detection assembly is arranged, the water quality in the incubation pool can be detected, the water quality data can be obtained in real time, and the water quality in the incubation pool is ensured to meet the hatching use of the perch fry. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a whole structure schematic view of the perch fry hatching equipment of the present application;

[0029] Figure 2 It is a structure schematic view of the heating assembly of the present application;

[0030] Figure 3 It is a structure schematic view of the height adjusting assembly of the present application;

[0031] Figure 4 It is a structure schematic view of the connecting ring of the present application;

[0032] Figure 5 It is a structure schematic view of the height adjusting ring of the present application;

[0033] Figure 6 It is a structure schematic view of the fish egg nest of the present application;

[0034] Figure 7 It is a structure schematic view of the first rotating rod of the present application;

[0035] Figure 8 It is a structure schematic view of the fish catching lifting disc of the present application;

[0036] Figure 9 It is a structure schematic view of the oxygen making device of the present application.

[0037] In the figure: 1-incubation pool; 101-outlet pipe; 102-detection assembly; 2-heating assembly; 201-heating bottom shell; 202-heating disc; 203-water supply column; 204-water inlet; 3-connection ring; 301-sleeve ring; 302-connection block; 303-rotation hole; 4-height adjustment ring; 401-lifting ring; 402-second threaded hole; 403-second sliding hole; 404-insertion hole; 5-first rotating rod; 501-screw rod; 502-roller; 6-fish egg nest; 601-insertion frame; 602-insertion slot; 603-insertion column; 604-connection frame; 605-coriolis; 7-fish lifting disc; 701-lifting frame; 702-first threaded hole; 703-first sliding hole; 704-filter screen; 705-center ring; 706-supporting rod; 8-oxygen generating device; 801-oxygen generator; 802-oxygen supply pipe; 803-sand head. DETAILED DESCRIPTION

[0038] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0039] Please refer to Figure 1 A sea bass fry hatching device, which comprises an incubation pool 1, a height adjustment assembly and a plurality of fish egg nests 6, the height adjustment assembly is arranged in the incubation pool 1, and the plurality of fish egg nests 6 are arranged on the height adjustment assembly, the height adjustment assembly is used for adjusting the height of the fish egg nests 6 extending into the incubation pool 1, and the bottom of the incubation pool 1 is provided with a heating assembly 2. The fish egg nests 6 are installed on the height adjustment assembly, the height of the fish egg nests 6 is adjusted according to the hatching requirement, the heating assembly 2 is arranged, the water temperature inside the incubation pool 1 can be balanced, the water temperature of different water layers is not different, the environmental conditions for fry hatching are met, the height of the fish egg nests 6 can be adjusted through the height adjustment assembly, the sinking depth of the fish egg nests 6 in the incubation pool 1 can be adjusted according to different sinking depths, and the use requirement for hatching is met, the large diurnal temperature difference is avoided, the water temperature of the water surface and the water bottom is different, and the hatching of the fry is affected.

[0040] Please refer to Figure 4 and Figure 5 The connection ring 3 comprises a sleeve ring 301 and a plurality of connection blocks 302 arranged on the inner side of the sleeve ring 301, the connection blocks 302 are provided with rotation holes 303, the sleeve ring 301 is embedded in the incubation pool 1, the height adjustment ring 4 comprises a lifting ring 401 and a plurality of flange blocks arranged on the outer side of the lifting ring 401, the plurality of flange blocks are respectively and spaced apart provided with second threaded holes 402 and second sliding holes 403, one flange block is overlapped with one connection block 302, and a plurality of insertion holes 404 are arranged on the sleeve ring 301 in a spaced apart manner.

[0041] Please refer to Figure 3 and Figure 7The height adjusting assembly comprises a connecting ring 3, a height adjusting ring 4, and a plurality of first rotating rods 5, the connecting ring 3 is arranged at the top of the hatching tank 1, the height adjusting ring 4 is arranged at the inner side of the connecting ring 3, and the plurality of first rotating rods 5 are arranged along the circumference of the connecting ring 3 and vertically arranged in the hatching tank 1, and the first rotating rods 5 are connected with the height adjusting ring 4.

[0042] The height adjusting assembly further comprises a plurality of second rotating rods, the hatching tank 1 is provided with a fish catching lifting disc 7, the plurality of second rotating rods are arranged along the circumference of the connecting ring 3, the top end of the second rotating rod is rotationally matched with the height adjusting ring 4, and the bottom end of the second rotating rod is threadedly connected with the fish catching lifting disc 7. The top end of the first rotating rod 5 is threadedly connected with the height adjusting ring 4, and the bottom end of the first rotating rod 5 is rotationally matched with the fish catching lifting disc 7.

[0043] Please refer to Figure 8 The fish catching lifting disc 7 comprises a lifting frame 701, a filter screen 704, and a center ring 705, the edge positions of the lifting frame 701 are respectively provided with first threaded holes 702 and first sliding holes 703 for connecting the first rotating rods 5 and the second rotating rods, the center ring 705 is arranged at the middle part of the lifting frame 701, and the filter screen 704 is arranged between the center ring 705 and the lifting frame 701. The fish catching lifting disc 7 further comprises a plurality of supporting rods 706, one end of each of the plurality of supporting rods 706 is connected with the center ring 705, and the other end of each of the plurality of supporting rods 706 is connected with the lifting frame 701. After the fish fry hatches, when it is necessary to transfer the fry to a feeding tank, the water in the hatching tank 1 is relatively deep, and the fry is relatively small, so it is relatively inconvenient to catch the fry. The second rotating rod is rotated, the fish catching lifting disc 7 is gradually lifted, and the born fish fry can be collected to the water surface due to the arrangement of the filter screen 704, so as to facilitate the operation personnel to catch the fry, improve the convenience of catching, and reduce the occurrence of the problem of missing fry.

[0044] In the embodiment, the number of the first rotating rods 5 and the second rotating rods is both 2, and the first rotating rods 5 and the second rotating rods are the same in structure and each comprise a lead screw 501 and a hand wheel 502. The top end of the lead screw 501 of the first rotating rod 5 is threadedly connected with the second threaded hole 402 of the lifting ring 401, and the bottom end of the first rotating rod 5 is rotationally connected with the first sliding hole 703 of the lifting frame 701. The top end of the lead screw 501 of the second rotating rod is rotationally connected with the second sliding hole 403 of the lifting ring 401, and the bottom end of the lead screw 501 of the second rotating rod is threadedly connected with the first threaded hole 702 of the lifting frame 701. Such a structure makes the two first rotating rods 5 keep the height of the fish catching lifting disc 7 unchanged while adjusting the height of the height adjusting ring 4, and the two second rotating rods keep the height of the height adjusting ring 4 unchanged while adjusting the height of the fish catching lifting disc 7.

[0045] The middle part of the incubation tank 1 is vertically provided with a water outlet pipe 101, and the outer wall of the water outlet pipe 101 is provided with a detection assembly 102 for detecting water quality. The detection assembly 102 can be a water quality detector or an aquaculture instrument. This part is prior art and will not be described here. The water outlet pipe 101 arranged at the center of the incubation tank 1 is used for the circulation of water in the tank, so as to ensure that the water quality inside the incubation tank 1 is good. Through the arrangement of the detection assembly 102, the water quality inside the incubation tank 1 can be detected, and water quality data can be obtained in real time, so as to ensure that the water quality inside the incubation tank 1 meets the incubation requirements of the perch fry.

[0046] Please refer to Figure 9 The top end of the water outlet pipe 101 is provided with an oxygen generating device 8. The oxygen generating device 8 includes an oxygenator 801, an oxygen supply pipe 802 and a sand head 803. The oxygenator 801 is arranged at the top end of the water outlet pipe 101. One end of the oxygen supply pipe 802 is connected with the oxygenator 801, and the other end of the oxygen supply pipe 802 is connected with the sand head 803. The oxygen generating device 8 is arranged at the center of the cavity of the incubation tank 1. The oxygen generating device 8 is used to increase the oxygen content in the water during the incubation of the fry, so as to ensure that the fry can be normally incubated and the survival rate is improved. The oxygen generating device 8 is a prior art means, and will not be described here. The overall design of the device meets the use requirements, and the structure is simple and reasonable, so as to improve the survival rate of the perch fry.

[0047] Please refer to Figure 6 The fish egg nest 6 includes a plug-in frame 601, a plug-in slot 602, a plug-in column 603 and a sun cover 605. The sun cover 605 is embedded in the plug-in frame 601. The top of the plug-in frame 601 is provided with the plug-in slot 602. The side wall of the plug-in frame 601 is provided with the plug-in column 603 connected with the height lifting ring 401. The plug-in column 603 is connected with the plug-in hole 404 of the height lifting ring 401. It is worth noting that in this embodiment, the sun cover 605 is embedded in the plug-in frame 601 in the form of a connecting frame 604. The sun cover 605 is made of palm leaves, which meets the use requirements of perch ovulation.

[0048] Please refer to Figure 2 The heating assembly 2 includes a heating bottom shell 201, a heating disc 202 and a plurality of water supply columns 203 arranged at intervals. The heating bottom shell 201 is connected with the bottom of the incubation tank 1 to form a heating bin. The heating disc 202 is arranged on the heating bottom shell 201. The water supply column 203 is vertically arranged on the outer wall of the incubation tank 1. The bottom end of the water supply column 203 is in communication with the heating bin. The side wall of the incubation tank 1 is provided with a water inlet 204 in communication with the water supply column 203. According to the structure of the incubation tank 1, the water temperature inside the incubation tank 1 can be kept balanced through the arrangement of the heating assembly 2, so as to improve the survival rate of the fry.

[0049] A perch fry incubation method of a perch fry incubation device includes the following steps:

[0050] S1: install the plurality of fish egg nests 6 on the height adjusting ring 4 in sequence;

[0051] S2: rotate the first rotating rod 5, and the height adjusting ring 4 is lowered below the water surface inside the incubation pond 1 along the first rotating rod 5;

[0052] S3: start the heating assembly 2, rotate the first rotating rod 5 again according to the water temperature inside the incubation pond 1, adjust the position of the fish egg nest 6 in the water temperature water layer, and wait for the fish fry on the fish egg nest 6 to hatch;

[0053] S4: after the fish fry hatches, rotate the first rotating rod 5, and the fish egg nest 6 is stretched out of the water temperature water layer;

[0054] S5: detach the fish egg nest 6 from the height adjusting ring 4, and fish the fish fry in the incubation pond 1.

[0055] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bass fry hatching device, characterized in that, include: Hatching pool (1), height adjustment assembly and multiple fish ovaries (6), the height adjustment assembly being disposed in the hatching pool (1); The height adjustment assembly includes a connecting ring (3), a height adjustment ring (4), and a plurality of first rotating rods (5). The connecting ring (3) is disposed at the top of the incubation pool (1), the height adjustment ring (4) is disposed inside the connecting ring (3), and the plurality of first rotating rods (5) are disposed along the circumference of the connecting ring (3). The first rotating rods (5) are vertical in the incubation pool (1), and the first rotating rods (5) are connected to the height adjustment ring (4). Multiple fish ovaries (6) are spaced apart on the height adjustment ring (4), and a heating component (2) is provided at the bottom of the hatching pool (1). The height adjustment assembly also includes multiple second rotating rods. A fishing lifting plate (7) is provided at the bottom of the hatching pool (1). The multiple second rotating rods are arranged around the circumference of the connecting ring (3). The top end of the second rotating rod is rotatably engaged with the height adjustment ring (4), and the bottom end of the second rotating rod is threadedly connected to the fishing lifting plate (7). The top end of the first rotating rod (5) is threadedly connected to the height adjustment ring (4), and the bottom end of the first rotating rod (5) is rotatably engaged with the fishing lifting plate (7). The connecting ring (3) includes a collar (301) and a plurality of connecting blocks (302) disposed inside the collar (301). The collar (301) is embedded in the incubation pool (1). The height adjustment ring (4) includes a lifting ring (401) and a plurality of flange blocks disposed outside the lifting ring (401). One flange block overlaps with one connecting block (302).

2. The bass fry hatching equipment according to claim 1, characterized in that, The heating assembly (2) includes a heating bottom shell (201), a heating plate (202), and a plurality of spaced water supply columns (203). The heating bottom shell (201) is connected to the bottom of the incubation pool (1) to form a heating chamber. The heating plate (202) is disposed on the heating bottom shell (201). The water supply columns (203) are vertically disposed on the outer wall of the incubation pool (1). The bottom end of the water supply column (203) is connected to the heating chamber. The side wall of the incubation pool (1) is provided with a water inlet (204) connected to the water supply column (203).

3. The bass fry hatching equipment according to claim 1, characterized in that, The fishing lifting plate (7) includes a lifting frame (701), a filter screen (704), and a central ring (705). The edge of the lifting frame (701) is provided with a first threaded hole (702) and a first sliding hole (703) for connecting the first rotating rod (5) and the second rotating rod, respectively. The central ring (705) is located in the middle of the lifting frame (701), and the filter screen (704) is laid between the central ring (705) and the lifting frame (701).

4. The bass fry hatching equipment according to claim 3, characterized in that, The fishing lifting plate (7) also includes multiple support rods (706), one end of each of the multiple support rods (706) is connected to the central ring (705), and the other end of each of the multiple support rods (706) is connected to the lifting frame (701).

5. The bass fry hatching equipment according to claim 1, characterized in that, A water outlet pipe (101) is vertically installed in the middle of the incubation pool (1), and a detection component (102) for detecting water quality is installed on the outer wall of the water outlet pipe (101).

6. The bass fry hatching equipment according to claim 5, characterized in that, An oxygen generating device (8) is provided at the top of the water outlet pipe (101). The oxygen generating device (8) includes an oxygenator (801), an oxygen delivery pipe (802), and a sand head (803). The oxygenator (801) is located at the top of the water outlet pipe (101). One end of the oxygen delivery pipe (802) is connected to the oxygenator (801), and the other end of the oxygen delivery pipe (802) is connected to the sand head (803).

7. The bass fry hatching equipment according to claim 1, characterized in that, The fish ovary (6) includes a connector frame (601), a connector groove (602), a connector post (603), and a pod (605). The pod (605) is embedded in the connector frame (601). The connector groove (602) is provided on the top of the connector frame (601), and the connector post (603) connected to the height adjustment ring (4) is provided on the side wall of the connector frame (601).

8. A method for hatching bass fry using the hatching equipment according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Install multiple fish ovaries (6) sequentially onto the height adjustment ring (4); S2: Rotate the first rotating rod (5), and the height adjustment ring (4) descends along the first rotating rod (5) to below the water surface inside the hatching pool (1); S3: Start the heating component (2), and according to the water temperature inside the hatching pool (1), rotate the first rotating rod (5) again to adjust the position of the fish ovary (6) in the water temperature layer, and wait for the fish fry on the fish ovary (6) to hatch. S4: After the fish fry hatch, rotate the first rotating rod (5), and the fish ovary (6) will extend out of the water layer; S5: Remove the fish ovary (6) from the height adjustment ring (4) and retrieve the fish fry from the hatching pond (1).

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