Multi-layer hatching device for roes

Abstract

The utility model discloses a multi-layer roe hatching device which comprises a frame body, a plurality of layers of separating frames and a plurality of layers of hatching devices. The incubation drawers are arranged on the partition frames on the corresponding layers in a sliding mode, water inlets and water outlets are formed in the incubation drawers, plugs are detachably connected to the water outlets, and water return openings are further formed in the incubation drawers; the hatching trays are arranged in the corresponding hatching drawers, and water outlet parts communicated with the hatching drawers are arranged on the bottom surfaces and the side walls of the hatching trays; the water flow circulating pipe fitting comprises a water outlet pipe fitting and a water return pipe fitting, the water outlet pipe fitting is connected with the water inlet, the water outlet pipe fitting is configured to simulate natural water flow to discharge water for roe incubation, the water return pipe fitting is connected with the water return port, and the water return pipe fitting is configured to recover water in the roe incubation process. The space occupied by the multi-layer roe hatching device is reduced, and the hatching efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fish artificial breeding technical field especially relates to a fish egg multilayer hatching device. BACKGROUND

[0002] Salmon is eaten by more and more people in daily diet because of high protein, low heat and rich in various vitamins and minerals, and therefore the demand of salmon is increasing, and its breeding industry is developing continuously in the global range. Fish egg hatching is one of the key links of salmon breeding, and directly influences the quality and yield of fry. The salmon egg hatching equipment on the market has some deficiencies, such as large floor area, insufficient protection of fish eggs, unable to monitor the hatching environment, and large difference from the hatching conditions of natural environment, thereby leading to low hatching efficiency, many dead eggs and abnormal fry.

[0003] Therefore, how to design a hatching condition close to natural environment and capable of monitoring the hatching environment to improve the hatching efficiency is the technical problem to be solved by the utility model. SUMMARY

[0004] The utility model provides a fish egg multilayer hatching device, realizes reduce the space of fish egg multilayer hatching device and improve hatching efficiency.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a fish egg multilayer hatching device, including:

[0007] Frame body, the frame body includes multilayer partition frame,

[0008] A plurality of hatching drawers, the hatching drawer is slidably arranged on the partition frame of the corresponding layer, the hatching drawer is equipped with water inlet and drain, the drain is detachably connected with the plug, and the hatching drawer is also equipped with the water return port,

[0009] Hatching tray, the hatching tray is arranged in the corresponding hatching drawer, and the bottom surface and the side wall of the hatching tray are all equipped with the water outlet part that is through the hatching drawer,

[0010] Water flow circulation pipe fitting, the water flow circulation pipe fitting includes water outlet pipe fitting and water return pipe fitting, the water outlet pipe fitting is connected with the water inlet, the water outlet pipe fitting is configured to simulate natural water flow outlet water for fish egg hatching, the water return pipe fitting is connected with the water return port, and the water return pipe fitting is configured to recycle the water in the fish egg hatching process.

[0011] In some embodiments of the present application, the water outlet part comprises a water outlet plate, and a plurality of first water outlet holes are arranged on the water outlet plate, wherein the diameter of the first water outlet hole is smaller than the diameter of the fish eggs.

[0012] In some embodiments of the present application, the water outlet pipe comprises a first water outlet pipe and a second water outlet pipe, the water inlet end of the first water outlet pipe is configured to be connected with a water source, the water outlet end of the first water outlet pipe is connected with the second water outlet pipe through a connecting pipe, the second water outlet pipe is located between the hatching tray and the hatching drawer, a plurality of second water outlet holes are arranged on the second water outlet pipe, and the second water outlet holes are arranged in an inclined downward direction by 45°.

[0013] In some embodiments of the present application, the second water outlet holes comprise two rows, and the two rows of second water outlet holes are symmetrically arranged along the radial direction of the second water outlet pipe. In some embodiments of the present application, the second water outlet pipe is arranged in a concave shape.

[0014] In some embodiments of the present application, the water return pipe comprises a first water return pipe and a second water return pipe, the water outlet end of the first water return pipe is configured to be connected with a sewage pipe, the water inlet end of the first water return pipe is connected with the second water return pipe, the second water return pipe is located below the hatching drawer, and the second water return pipe is connected with the water return port through a connecting pipe.

[0015] In some embodiments of the present application, a liquid level pipe is detachably connected to the water return port.

[0016] In some embodiments of the present application, a sound attenuation structure is connected to the first water return pipe, and the sound attenuation structure is used to eliminate the noise generated by the water return pipe during the water return process.

[0017] In some embodiments of the present application, the sound attenuation structure comprises an exhaust pipe and a silencer, the exhaust pipe is connected to the first water return pipe, and the top end of the exhaust pipe is connected with the silencer.

[0018] In some embodiments of the present application, a plurality of reinforcing ribs are arranged on the bottom surface of the hatching drawer.

[0019] Compared with the prior art, the advantages and positive effects of the utility model are: through setting the frame body as multilayer, setting hatching drawer and hatching tray on each layer, improve the space utilization, reduce the occupied area of the breeding ground, reduce the purchase and operation cost required by salmon breeding; through setting the water outlet pipe piece simulates natural water flow, provides more close to natural environment hatching condition for salmon egg, thereby significantly improve the hatching rate of salmon egg, reduce the appearance of dead egg and abnormal fry; through the hatching drawer sliding connection on the frame body, ensure that each layer of hatching tray has independent observation window, convenient for the operator to carry out the operation such as fish egg feeding, inspection and taking out, at the same time, it is convenient for real-time observation of the hatching condition of fish egg, can find and handle the problem in time, improve the efficiency and quality of breeding management. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will be briefly introduced the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description is some embodiments of the utility model, for those skilled in the art, without the premise of creating labor intensity, can also obtain other drawings according to these drawings.

[0021] Figure 1 It is the structure schematic diagram of the fish egg multilayer hatching device one embodiment of the utility model;

[0022] Figure 2 It is Figure 1 The top view;

[0023] Figure 3 It is the explosion schematic diagram of the second water return pipe, hatching drawer, second water outlet pipe and hatching tray in the fish egg multilayer hatching device one embodiment of the utility model;

[0024] Figure 4 It is the structure schematic diagram of the hatching tray in the fish egg multilayer hatching device one embodiment of the utility model;

[0025] Figure 5 It is the enlarged schematic diagram of the second water outlet pipe in the fish egg multilayer hatching device one embodiment of the utility model;

[0026] Figure 6 It is the structure schematic diagram of the square water outlet plate in the fish egg multilayer hatching device one embodiment of the utility model;

[0027] Figure 7 It is the structure schematic diagram of the rectangular water outlet plate in the fish egg multilayer hatching device one embodiment of the utility model;

[0028] Figure 8 It is the setting position schematic diagram of the second water outlet hole on the second water outlet pipe in the fish egg multilayer hatching device one embodiment of the utility model.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 100, frame body;

[0031] 200, incubation drawer; 201, water inlet; 202, water outlet; 203, backwater inlet; 204, reinforcing rib; 205, connecting part; 206, liquid level pipe;

[0032] 300, incubation tray; 301, water outlet plate; 302, first water outlet hole; 303, frame; 3031, stop part;

[0033] 400, water outlet pipe; 401, first water outlet pipe; 402, second water outlet pipe; 4021, second water outlet hole;

[0034] 500, backwater pipe; 501, first backwater pipe; 502, second backwater pipe; 503, exhaust pipe;

[0035] 600, sliding block; 601, sliding frame; 602, sliding rail. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0037] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the direction or positional relationship of the terms based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect" and so on should be broad sense understanding, for example, can be fixed connection, also can be detachably connected, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be two element internal communication. For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0039] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features directly contact, can also include the first and second features are not directly contact but contact through another feature between them. Moreover, the first feature is "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0040] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeatedly refer to numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0041] As Figures 1 to 8 As shown in the utility model provides a kind of fish egg multilayer incubator, can increase the utilization of incubation space, can simulate natural water flow environment to carry out salmon egg incubation, while it is convenient to manage and operate, fish egg multilayer incubator includes frame body 100, incubation drawer 200, incubation tray 300 and water flow circulation pipe piece. Specifically:

[0042] Frame body 100, including multilayer partition, each layer thereof is used to install incubation drawer 200, and the frame body 100 of multilayer makes the space required for cultivation from planarization become stereoscopic, reduces the cultivation space required for incubation.

[0043] A plurality of hatching drawers 200 are respectively slidably connected to each layer of the shelf body 100 through a sliding structure, the sliding structure comprises a sliding frame 601, a sliding block 600 and a sliding rail 602, the sliding frame 601 is fixedly installed at the bottom of the hatching drawer 200, the sliding block 600 is fixedly connected to the two sides of the sliding frame 601, the sliding rail 602 is fixed to the shelf body 100, and the sliding block 600 is slidably connected to the sliding rail 602.

[0044] The hatching drawer 200 is provided with a water inlet 201 and a drainage outlet 202, the water inlet 201 is used to provide water for salmon egg hatching, and the drainage outlet 202 is used to drain the waste water after the salmon egg hatching. A plug is detachably connected to the drainage outlet 202, the plug is detached from the drainage outlet 202 when drainage is needed, and the plug is connected to the drainage outlet 202 in a threaded connection manner, that is, the plug and the drainage outlet 202 are provided with matched threads. The hatching drawer 200 is also provided with a backwater inlet 203, which is used to flow out the water in the hatching drawer 200 from the backwater inlet 203 when the liquid level exceeds the backwater inlet 203. The water outlet and backwater process ensure that the salmon eggs are always hatched in running water, so that the salmon eggs can fully contact fresh water, improve the hatching quality, and the backwater inlet 203 can also avoid the overflow of the hatching drawer 200 when the liquid level is too high.

[0045] As shown in Figure 3 The hatching drawer 200 of each layer in the embodiment comprises two placing grooves, and the placing grooves are used to place the hatching tray 300. The hatching drawer 200 provided with two placing grooves can increase the bearing strength of the hatching drawer 200, thereby improving the service life of the hatching device. In order to ensure the connection strength of the hatching drawer 200, the hatching drawer 200 adopts an integrated structure, and the backwater inlet 203 is arranged on the connecting portion 205 between the two placing grooves.

[0046] The hatching tray 300 is placed in the placing groove of the hatching drawer 200, so that two hatching trays 300 are placed on the hatching drawer 200 of each layer of the shelf. The bottom surface and the four side walls of the hatching tray 300 are provided with water outlets penetrating through the hatching drawer 200, and the water flow can enter the hatching tray 300 from multiple angles of the side walls and the bottom surface to contact the fish eggs for hatching.

[0047] The water flow circulation pipe fittings include a water outlet pipe fitting 400 and a water return pipe fitting 500. The water outlet pipe fitting 400 is connected with the water inlet 201 and is configured to simulate the water flow state of natural water flow to provide water for fish egg hatching. The water return pipe fitting 500 is connected with the water return port 202 and is configured to recycle water in the fish egg hatching process. The water outlet end of the water return pipe fitting 500 can be connected with a sewage pipe (not shown in the figure). The recycled water enters the sewage pipe, and the sewage pipe can be connected with a water treatment device (not shown in the figure). The sewage treated by the water treatment device can be used for aquaculture again.

[0048] In use, the hatching drawer 200 of each layer is pulled out, the fish eggs are placed in the hatching tray 300, and then the hatching drawer 200 is pushed in. The water flows into the hatching tray 300 through the water outlet pipe fitting 400, the water inlet 201 and the water outlet part, and the fish eggs are hatched. When sewage is needed, the plug is removed, and the sewage flows into the sewage pipe through the water outlet part, the water outlet port 202 and the water return pipe fitting 500.

[0049] As shown in Figure 4 , Figure 6 and Figure 7 , the water outlet part includes a water outlet plate 301. The water outlet plate 301 is provided with a plurality of first water outlet holes 302. The diameter of the first water outlet hole 302 is smaller than the diameter of the fish eggs. In this embodiment, the hatching tray 300 is assembled by a frame 303 and the water outlet plate 301. The frame 303 is a cuboid structure, and the top of the cuboid extends to the periphery to form a stop part 3031. The stop part 3031 is used for clamping the four side walls of the hatching drawer 200, so that the hatching tray 300 is placed in the hatching drawer 200. The water outlet plate 301 includes a square and a rectangle. The square water outlet plate 301 is installed on the bottom surface of the frame 303, and the rectangular water outlet plate 301 is installed on the four side surfaces of the frame 303.

[0050] When the hatching tray 300 is placed in the hatching drawer 200 and the water outlet pipe fitting 400 is used to discharge water, the water enters the hatching tray 300 from the four side walls and the bottom surface of the hatching tray 300 through the first water outlet holes 302 on the water outlet plate 301, and contacts the fish eggs for hatching. The first water outlet holes 302 are uniformly distributed on the water outlet plate 301, which can ensure uniform water outlet and avoid the adverse effects of excessive water flow on fish egg hatching.

[0051] Compared with the way of directly punching holes on the hatching tray 300 in the integrated structure, the water outlet part is easier to mold and greatly reduces the production cost.

[0052] As shown in Figure 1As shown, the water outlet pipe 400 includes a first water outlet pipe 401 and a second water outlet pipe 402, the water inlet end of the first water outlet pipe 401 is configured to be connected with the water source, the water outlet end of the first water outlet pipe 401 is connected with the second water outlet pipe 402 through a connecting pipe, the connecting pipe can be a hose, the hose has a certain length, and the water outlet pipe is connected through the hose, so that the incubation tray 300 can continuously supply water during the process of pulling out and pushing in the incubation drawer 200, and the continuity of the incubation process is ensured; the second water outlet pipe 402 is located between the incubation tray 300 and the incubation drawer 200, and a plurality of second water outlet holes 4021 are arranged on the second water outlet pipe 402, and the second water outlet holes 4021 are arranged at an angle of 45° downward.

[0053] The first water outlet pipe 401 is located above and at both ends of the frame body 100, and a water pump (not shown in the figure) is further connected between the first water outlet pipe 401 and the water source. The water pump can pump water into the incubation tray 300 located at a high position. The second water outlet pipe 402 is arranged between the incubation tray 300 and the incubation drawer 200 of each layer. The connection between the first water outlet pipe 401 and the second water outlet pipe 402 is further provided with a flow meter (not shown in the figure), which can set the water flow rate according to the needs of placing different batches or different varieties of salmon eggs, and better simulate the water flow in the natural environment.

[0054] As shown in Figure 8 , the second water outlet hole 4021 is arranged at an angle downward, so that the water flowing out of the second water outlet pipe 402 first flows to the bottom of the incubation tray 300 and then flows upward, thereby stirring the water and achieving the effect of increasing oxygen. The angle of the second water outlet hole 4021 can prevent the hole from collecting dirt and can increase the water flow rate to flush the dirt on the bottom surface of the incubation drawer 200 after incubation, thereby preventing splashing.

[0055] As shown in Figure 5 , the second water outlet hole 4021 includes two rows, and the two rows of second water outlet holes 4021 are symmetrically arranged along the radial direction of the second water outlet pipe 402. The uniform distribution of the second water outlet holes 4021 along the radial direction of the second water outlet pipe 402 can ensure uniform water distribution in the incubation tray 300, and the symmetrical arrangement of the two rows of second water outlet holes 4021 can improve the effect of stirring water and increasing oxygen, and can clean the dirt on the bottom surface of the incubation drawer 200, thereby preventing dead angles.

[0056] The second water outlet pipe 402 is arranged in a concave shape. The concave-shaped water distribution pipe can ensure that the water is distributed to the entire incubation tray 300 at the bottom, and compared with a mouth-shaped or other more complex arrangement of the second water outlet pipe 402, the cost is greatly reduced while the water outlet effect is ensured.

[0057] As shown in Figure 1As shown, the backwater pipe 500 includes a first backwater pipe 501 and a second backwater pipe 502, the water outlet end of the first backwater pipe 501 is configured to be connected with the drain pipe, the water inlet end of the first backwater pipe 501 is connected with the second backwater pipe 502, the second backwater pipe 502 is located below the incubation drawer 200, and the second backwater pipe 502 is connected with the backwater outlet 203 through a connecting pipe, which can be a hose. The hose needs to have a certain length, and the connecting pipe can also include a straight pipe and a plug pipe (not shown in the figure). The plug pipe is connected below the backwater outlet 203, and the upper surface of the straight pipe is provided with an opening. The width of the opening is matched with the size of the plug pipe, and the length of the opening can be set according to the distance required by the movement of the incubation drawer 200. The plug pipe is slidingly connected in the opening on the straight pipe. Through the above two pipe connection modes, it is convenient to keep the incubation tray 300 continuously watered during the pulling out and pushing in of the incubation drawer 200, and the continuity of the incubation process is ensured.

[0058] The first backwater pipe 501 is located on one side of the frame body 100, and the second backwater pipe 502 is located below the incubation drawer 200. During normal incubation, when the water level in the incubation drawer 200 is high enough to reach the backwater outlet 203, the water will flow out of the backwater outlet 203, enter the drain pipe through the second backwater pipe 502 and the first backwater pipe 501, and then be connected with the water treatment equipment. The sewage treated by the water treatment equipment can be reused in aquaculture. The water treatment equipment can be the existing one on the market.

[0059] The backwater outlet 203 is detachably connected with a liquid level pipe 206. Different liquid level pipes 206 can be used to maintain different liquid level heights in the incubation drawer 200. The height of the liquid level pipe 206 can be selected according to the incubation requirements, and the liquid level pipe 206 can be installed in the backwater outlet 203 in a plug-in manner.

[0060] The first backwater pipe 501 is connected with a sound insulation structure. The first backwater pipe 501 and the second backwater pipe 502 will produce noise during the backwater process. The sound insulation structure is used to eliminate the noise generated by the backwater pipe 500 during the backwater process, so as to avoid the adverse effects of noise on salmon incubation.

[0061] The sound insulation structure includes an exhaust pipe 503 and a silencer (not shown in the figure). The exhaust pipe 503 is connected to the top end of the first backwater pipe 501, and the top end of the exhaust pipe 503 is connected with the silencer. The exhaust pipe 503 can provide a containing space for the air escaping from the water body during the backwater process, and the silencer can absorb and eliminate the noise generated by the air. The silencer can be a plastic silencer on the market. The material of the plastic silencer can avoid corrosion and improve the service life.

[0062] As shown in Figure 3 The bottom surface of the incubation drawer 200 is provided with a plurality of reinforcing ribs 204. Since the incubation drawer 200 is suspended on the sliding frame 601, the weight is very large after adding water, and the reinforcing ribs 204 can increase the strength of the incubation drawer 200, so as to ensure that the incubation drawer 200 does not deform, thereby ensuring the normal incubation of the fish eggs.

[0063] The fish egg multilayer incubation device provided by the present application adopts the push-pull mode of the incubation drawer 200 to ensure that each layer of the incubation tray 300 has an independent operation interface and an observation window, which facilitates the operator to perform the operations such as fish egg feeding, checking and taking out, and facilitates the operator to observe the incubation of the fish eggs in real time, so as to discover and handle the problems in the incubation process in time, thereby improving the efficiency and quality of breeding management; the optimized water flow simulation and efficient simulation oxygenation provide more natural incubation conditions for salmon eggs, which can significantly improve the incubation rate of the salmon eggs and reduce the occurrence of dead eggs and abnormal fry; the multilayer structure design improves the space utilization rate and reduces the occupied area of the breeding site.

[0064] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

[0066] As far as possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can be the subject of a divisional application.

Claims

1. A multi-layered fish egg hatching apparatus, characterized by, The utility model relates to a fish egg incubator, comprising: a frame body comprising multiple layers of shelves; a plurality of incubation drawers slidably arranged on the shelves of the corresponding layers, the incubation drawers being provided with a water inlet and a water outlet, the water outlet being detachably connected with a plug, and the incubation drawers further being provided with a water return port; an incubation tray arranged in the corresponding incubation drawer, the incubation tray being provided with a water outlet on its bottom surface and side wall and communicating with the incubation drawer; a water flow circulation pipe assembly comprising a water outlet pipe and a water return pipe, the water outlet pipe being connected with the water inlet and configured to simulate natural water flow for fish egg incubation, and the water return pipe being connected with the water return port and configured to recycle water used in the fish egg incubation process.

2. The fish egg multi-layer hatching apparatus according to claim 1, wherein The water outlet comprises a water outlet plate provided with a plurality of first water outlet holes, the diameter of the first water outlet holes being smaller than that of the fish eggs.

3. The fish egg multi-layer hatching apparatus according to claim 1, wherein The water outlet pipe comprises a first water outlet pipe and a second water outlet pipe, the water inlet end of the first water outlet pipe being configured to be connected with a water source, the water outlet end of the first water outlet pipe being connected with the second water outlet pipe through a connecting pipe, the second water outlet pipe being located between the incubation tray and the incubation drawer, and the second water outlet pipe being provided with a plurality of second water outlet holes inclined downward by 45°.

4. The fish egg multi-layer hatching apparatus according to claim 3, wherein The second water outlet holes comprise two rows arranged symmetrically along the radial direction of the second water outlet pipe.

5. The fish egg multi-layer hatching apparatus according to claim 4, wherein The second water outlet pipe is arranged in a concave shape.

6. The fish egg multi-layer hatching apparatus according to claim 1, wherein The water return pipe comprises a first water return pipe and a second water return pipe, the water outlet end of the first water return pipe being configured to be connected with a sewage pipe, the water inlet end of the first water return pipe being connected with the second water return pipe, the second water return pipe being located below the incubation drawer, and the second water return pipe being connected with the water return port through a connecting pipe.

7. The fish egg multi-tier hatching apparatus according to claim 1, wherein A liquid level pipe is detachably connected with the water return port.

8. The fish egg multi-tier hatching apparatus according to claim 6, wherein An acoustic structure is connected with the first water return pipe, and the acoustic structure is used to eliminate the noise generated by the water return pipe during the water return process.

9. The fish egg multi-tier hatching apparatus according to claim 8, wherein The acoustic structure comprises an exhaust pipe and a silencer, the exhaust pipe being connected with the first water return pipe, and the top end of the exhaust pipe being connected with the silencer.

10. The fish egg multi-tier hatching apparatus according to claim 1, wherein A plurality of reinforcing ribs are arranged on the bottom surface of the incubation drawer.

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