Crayfish egg in-vitro hatching device and hatching method

Abstract

The invention provides a crayfish egg in-vitro hatching device and hatching method, and relates to the technical field of in-vitro hatching. The in-vitro hatching device for the crawfish eggs comprises a hatching barrel, wherein a plurality of overflow ports are formed in the side wall of the hatching barrel; an egg containing barrel is embedded in the hatching barrel, the top end of the egg containing barrel is rotationally connected with an upper cover plate, and an aeration pipe is connected to the upper cover plate in an inserted mode and extends to the inner bottom of the egg containing barrel; the outer wall of the hatching barrel is sleeved with an overflow barrel, the aeration pipe is rotationally communicated with a first power mechanism, the first power mechanism is coaxially and rotationally embedded in the egg containing barrel, air is continuously injected to drive water to roll on the inner side and the outer side of the egg containing barrel, and active eggs and inactive eggs are gradually separated; the screening holes are utilized to gradually separate inactive eggs from active eggs, and the eggs overflow into the overflow cylinder from the overflow port under the rolling action of the water body, so that good eggs and bad eggs are separated, and bacteria on the bad eggs are prevented from quickly infecting the good eggs.

Description

Technical Field

[0001] The present application relates to the technical field of in vitro hatching, and in particular to an in vitro hatching device and method for crayfish eggs. Background Art

[0002] Crayfish is widely loved by the public because of its rich flavor after being cooked in a variety of ways, and its meat is firm, chewy, tender and juicy. The demand for crayfish production is increasing year by year.

[0003] Traditional crayfish breeding mostly uses the natural hatching method of female shrimps holding eggs, which has many problems. First, the hatching of crayfish eggs under natural conditions is greatly affected by external environmental factors, such as water temperature, water quality, dissolved oxygen content, natural enemies, etc., which are difficult to accurately control. This may lead to unstable hatching rates of shrimp eggs and uneven quality of hatched larvae, which is not conducive to large-scale and standardized breeding of crayfish. Second, it is difficult to collect shrimp fry, and the sizes of shrimp fry are uneven, which makes it easy for the big ones to bully the small ones and the young shrimps to be eaten as soon as they molt, resulting in serious loss of shrimp fry.

[0004] In order to improve the hatching rate of shrimp eggs in the prior art, artificial hatching of shrimp eggs is also adopted. However, during the artificial hatching process, the shrimp eggs are often infected with "water mold" due to factors such as water flow and water quality, which leads to the death of the shrimp eggs. If the problem is not handled in time, the hatching shrimp eggs will be quickly infected by the "water mold", resulting in damage to a large area of ​​active shrimp eggs. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an in vitro hatching device for crayfish eggs, comprising an incubation tube, wherein the inner bottom of the incubation tube is coaxially fixed with a bottom plate, the bottom plate and the bottom end of the side wall of the incubation tube are provided with holes connected to the external water body, and the upper part of the side wall of the incubation tube is circumferentially provided with a plurality of overflow ports; an egg holding tube is embedded in the incubation tube, the bottom and side walls of the egg holding tube are provided with holes for the water body to pass through, the top of the egg holding tube is rotatably connected with an upper cover plate, the upper cover plate is annularly raised, a plurality of screening holes are evenly arranged on the upper cover plate, an aeration pipe is coaxially rotatably plugged on the upper cover plate, the aeration pipe is externally connected to an air supply device, and the aeration pipe extends to the inner bottom of the egg holding tube; an overflow tube is sleeved on the outer wall of the incubation tube, and the overflow tube is located at the overflow The bottom side of the overflow tube is connected with the external water body; the aeration tube extends to one end of the bottom of the inner bottom of the egg holding tube and is rotatably connected with a first power mechanism, and the first power mechanism is coaxially rotatably embedded in the egg holding tube. The first power mechanism includes a direction-changing component and a spoiler component. A plurality of airflow channels are evenly arranged on the inner circumference of the direction-changing component. The airflow channel converts the axial airflow delivered by the aeration tube into a radial airflow and delivers it to the inner bottom of the egg holding tube, and the airflow channel uses the power brought by the airflow to enable the direction-changing component to have rotational potential energy. The spoiler component is coaxially fixed to the bottom side of the direction-changing component, and the spoiler component is between the inner bottom of the hatching tube and the bottom side of the egg holding tube. The spoiler component rotates with the direction-changing component and stirs the water therebetween.

[0006] Preferably, a limit ring is coaxially fixed on the outer wall of the incubation tube, and the limit ring is used to limit the position of the overflow tube; at least two symmetrical limit blocks are arranged on the inner wall of the incubation tube, and at least two hanging ears are symmetrically arranged on the outer wall of the egg holding tube, and the hanging ears are fixed with pins, and the pins are slidably inserted in the limit blocks.

[0007] Preferably, the holes arranged at the bottom ends of the bottom plate and the side walls of the hatching tube and communicating with the external water body are axial communicating holes and radial communicating holes respectively.

[0008] Preferably, the inner bottom of the egg holding tube is conical, and the holes on the conical inner bottom through which the water supply body passes are axial through holes, which are evenly distributed on the inner bottom of the egg holding tube, and the holes on the side wall of the egg holding tube through which the water supply body passes are radial through holes, which are evenly circumferentially arranged on the upper half of the side wall of the egg holding tube.

[0009] Preferably, the overflow tube is arranged in a ring shape, the top of the ring-shaped overflow tube is open, and the top of the outer wall of the overflow tube is higher than the top of the inner wall. An overflow chamber is arranged inside the overflow tube, and the outer wall and the bottom of the overflow tube are provided with multiple through holes to connect the overflow chamber with the external water body.

[0010] Preferably, the direction-changing assembly comprises a top guide piece, a plurality of arc-shaped plates and a bottom guide piece, wherein the top guide piece is rotatably sleeved on the aeration pipe; the plurality of arc-shaped plates are circumferentially and evenly fixed on the bottom side of the top guide piece; the bottom guide piece is coaxially fixed to the bottom side of the plurality of arc-shaped plates; the plurality of arc-shaped plates form a plurality of airflow channels between the top guide piece and the bottom guide piece, and the plurality of airflow channels are arc-shaped with the bottom being larger than the top.

[0011] Preferably, a first annular arc surface is provided on the bottom side of the top flow guide piece, and the first arc surface is upward from the axis center to the outside; a second annular arc surface is provided on the upper side of the bottom flow guide piece, and the second arc surface is upward from the axis center to the outside; a plurality of arc plates are evenly fixed between the first arc surface and the second arc surface in the circumferential direction; an arc-shaped protrusion is provided on the upper side of the bottom flow guide piece, and the arc-shaped protrusion is located on the inner side of the second arc surface; a conical surface is provided on the top side of the top flow guide piece.

[0012] Preferably, a plurality of first spoilers are evenly arranged circumferentially on the bottom side of the spoiler assembly, a plurality of second spoilers are evenly arranged circumferentially on the top side of the spoiler assembly, and the second spoilers are slidably matched with the bottom end of the egg holding tube.

[0013] Preferably, the first spoiler is arranged in an arc shape, and the first spoiler gradually expands from the axis outward, an arc channel is formed between the first spoilers, and the two arc side surfaces of the first spoiler are respectively a third arc surface and a fourth arc surface.

[0014] On the other hand, the present application further provides a method for in vitro hatching of crayfish eggs, comprising the following steps: S1: Water treatment: Method 1: Select water in the living environment of parent shrimps and place it in an incubation tank or other related water container, and put a heating rod in the container to keep the water temperature at 18℃-20℃, and inject a certain amount of gentamicin into the water; Method 2: Select clean water in the incubation container that has been oxygenated or dried in the sun for 24 hours, and keep the water temperature at 18℃-20℃, and inject a certain amount of gentamicin into the water; S2: taking eggs, taking shrimp eggs from the abdominal appendages of the parent shrimp, and placing the shrimp eggs in an egg-holding tube, embedding the egg-holding tube in the inside of the hatching tube, and placing the hatching tube in the water body in the hatching container, with the upper cover plate located underwater, the water surface located between the overflow ports, and using an aeration pipe to connect an air supply device to continuously inject air into the bottom of the egg-holding tube; S3: hatching, after the aeration pipe continuously injects air into the bottom of the egg-holding tube, the airflow enters the direction-changing component and turns, and is radially ejected from the side wall of the direction-changing component to the bottom of the egg-holding tube. Under the power of the airflow, the direction-changing component and the flow-disturbing component are synchronously rotated, and the airflow is ejected to drive the water body to roll in the egg-holding tube and form a certain degree of rotation; part of the airflow enters between the bottom of the egg-holding tube and the hatching tube at the bottom of the egg-holding tube, and under the rotation of the flow-disturbing component, it rises from the outer side of the side wall of the egg-holding tube and the inner wall of the hatching tube to the water surface and breaks; the shrimp eggs located at the bottom of the egg-holding tube begin to roll in the egg-holding tube under the tumbling action of the water body driven by the airflow; S4: bad eggs are removed. When the eggs in incubation are tumbling in the egg-holding tube, the eggs with vitality and the eggs without vitality will be separated in the tumbling process. Due to the difference in quality, the bad eggs without vitality will tumble to a greater extent, and the good eggs with vitality will tumble to a lesser extent. The bad eggs that tumble to a greater extent will enter the upper side of the upper cover through the screening hole after rising to the upper cover. Under the action of the airflow that rises to the water surface and breaks between the outer side of the side wall of the egg-holding tube and the inner wall of the hatching tube, and the action of the water body between the outer side of the side wall of the egg-holding tube and the inner wall of the hatching tube disturbed by the rotation of the spoiler component, the bad eggs that enter the upper side of the upper cover will roll with the water body and enter the overflow tube from the overflow port; S5: Discard bad eggs in time. During the hatching process, if bad eggs are found in the overflow tube, take out the overflow tube in time, remove the bad eggs inside, and then put them back into the hatching tube until the shrimp eggs in the egg tube are hatched into crayfish seedlings; S6: The seedlings should be kept in a resting state in the initial stage. The hatched seedlings should be kept in the hatching water for a period of time. They do not need to be fed during this period, but oxygen should be added to the water. The yolk on the seedlings should be observed at any time until the yolk disappears. Then they can be transferred to the breeding water and fed with algae or small plankton for normal breeding.

[0015] The in vitro incubation device for crayfish eggs of the present application has the following beneficial effects: 1. During the incubation process, air is continuously injected to drive the water to roll inside the egg-holding tube, so that active eggs and inactive eggs are gradually separated, and the screening holes on the upper cover are used to gradually separate the inactive eggs from the active eggs. Under the action of the water rolling, the water overflows from the overflow port into the overflow tube, so as to separate good eggs from bad eggs and prevent the bacteria on the bad eggs from quickly infecting the good eggs; 2. The movable overflow tube can be used to quickly remove the isolated bad eggs from the incubation container to prevent the bad eggs from affecting the water quality; 3. Use the spoiler assembly to drive the water outside the egg-holding tube to rotate, and use the injected air to overflow from the bottom of the egg-holding tube to make the water outside the egg-holding tube roll during the rotation process, thereby improving the efficiency of bad eggs entering the overflow tube from the overflow port; 4. The annular protrusion of the upper cover plate is used to make the water flow inside the egg-containing tube tumble better.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of a device for in vitro hatching of crayfish eggs according to an embodiment of the present application; Figure 2 This is a schematic diagram of the internal structure of a device for in vitro hatching of crayfish eggs according to an embodiment of the present application; Figure 3 It is a partial structural schematic diagram of a crayfish egg in vitro hatching device according to an embodiment of the present application; Figure 4 According to the embodiment of the present application Figure 3 A magnified view of middle; Figure 5 is a side view of the incubation cylinder according to an embodiment of the present application when viewed from above; Figure 6 is a top view of the incubation cylinder according to an embodiment of the present application; Figure 7 It is a partial structural schematic diagram of an egg holding tube and an upper cover plate according to an embodiment of the present application; Figure 8 is a partial structural exploded diagram of the first power mechanism according to an embodiment of the present application; Fig. 9 is a bottom side view of a spoiler assembly according to an embodiment of the present application; Fig.10 is a structural schematic diagram of a second power mechanism according to an embodiment of the present application; Fig.11is a partial structural exploded diagram of a second power mechanism according to an embodiment of the present application; Fig.12 is a side view of an undulating member according to an embodiment of the present application; Fig.13 is a schematic diagram of the positions of auxiliary components according to an embodiment of the present application; Fig.14 is a schematic diagram of a partial structure of an auxiliary component according to an embodiment of the present application; Fig.15 According to the embodiment of the present application Fig.14 Enlarged view of B.

[0019] Icons: 1. Hatching tube; 101. Limiting ring; 102. Limiting block; 11. Bottom plate; 111. Axial connecting hole; 12. Overflow port; 13. Radial connecting hole; 2. Egg holding tube; 201. Axial through hole; 202. Radial through hole; 203. Hanging ear; 204. Pin; 21. Upper cover plate; 211. Screening hole; 22. Aeration pipe; 3. Overflow tube; 31. Overflow chamber; 32. Through hole; 4. First power mechanism; 41. Direction changing assembly; 411. Top guide piece; 412. Arc plate; 413. Bottom guide piece; 414. First arc surface; 415. Second arc shaped surface; 416, arc-shaped protrusion; 417, conical surface; 42, spoiler assembly; 421, first spoiler; 422, second spoiler; 423, arc-shaped channel; 424, third arc-shaped surface; 425, fourth arc-shaped surface; 5, second power mechanism; 51, elastic assembly; 511, positioning cylinder; 512, sliding pin; 513, elastic member; 52, lever; 521, snap ring; 53, undulating member; 531, protrusion; 532, latch; 533, first slope; 534, second slope; 6, auxiliary assembly; 61, sleeve; 611, injection hole; 62, spiral strip. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] Embodiment 1: According to an embodiment of the present application, a device for in vitro hatching of crayfish eggs comprises a hatching tube 1. In a specific embodiment of the present application, the hatching tube 1 is in a straight cylindrical shape with an open top.

[0022] Among them, Figure 2 and Figure 3As shown, a bottom plate 11 is coaxially fixed to the inner bottom of the hatching tube 1, and holes communicating with the external water body are provided on the bottom plate 11 and the bottom end of the side wall of the hatching tube 1, so that the water body can enter the inside of the hatching tube 1, and a plurality of overflow ports 12 are circumferentially provided on the upper part of the side wall of the hatching tube 1. Specifically, the size of the overflow port 12 is much larger than the size of the shrimp eggs.

[0023] The hatching tube 1 is embedded with an egg holding tube 2. It should be noted that in the specific embodiment of the present application, the egg holding tube 2 is arranged in a straight cylinder, and the egg holding tube 2 is detachably embedded in the hatching tube 1. The inner bottom and outer side of the egg holding tube 2 are spaced apart from the hatching tube 1. The bottom and side walls of the egg holding tube 2 are provided with holes for water to pass through, so that the water can enter the egg holding tube 2. The top of the egg holding tube 2 is rotatably connected with an upper cover plate 21. Specifically, the upper cover plate 21 and the egg holding tube 2 are detachably installed, and the upper cover plate 21 and the egg holding tube 2 are axially positionable (not shown in the specific structural diagram, a concave rotating block can be provided on the egg holding tube 2, and the concave end of the concave rotating block is clamped on the circumferential side of the upper cover plate 21, so that the axial positioning between the upper cover plate 21 and the egg holding tube 2 can be achieved, and the rotation of the upper cover plate 21 will not be affected. Alternatively, other methods can be used. Technical personnel in the relevant fields are familiar with this and no special limitation is made here). Figure 2 and Figure 3 As shown, the upper cover plate 21 is arranged in an annular raised manner, that is, the upper cover plate 21 is arranged in an annular shape as a whole, and the annular part is arranged in a raised shape. A plurality of screening holes 211 are evenly arranged on the upper cover plate 21. It should be noted that in the specific embodiment of the present application, the size of the screening hole 211 is slightly larger than the size of a single shrimp egg. An aeration pipe 22 is coaxially rotatably plugged on the upper cover plate 21. The aeration pipe 22 is externally connected to an air supply device, and the aeration pipe 22 extends to the inner bottom of the egg holding tube 2, so as to add oxygen to the hatching water and increase the oxygen content of the water.

[0024] like Figure 1-Figure 3 As shown, an overflow tube 3 is sleeved on the outer wall of the hatching tube 1, and the overflow tube 3 is located at the bottom side of the overflow port 12. The interior of the overflow tube 3 is connected to the external water body. It can be understood that in the specific embodiment of the present application, the overflow tube 3 is detachably sleeved on the outside of the hatching tube 1 to facilitate installation or disassembly. At the same time, the inside of the overflow tube 3 is connected to the external water body, which is convenient for the formation of circulation between the internal water body and the external water body of the entire hatching tube 1, avoiding the formation of stagnant water in the hatching water inside the hatching tube 1, and then inhibiting the formation of pathogens to a certain extent.

[0025] like Figure 2 and Figure 3As shown, the aeration pipe 22 extends to one end of the inner bottom of the egg holding tube 2 and is rotatably connected to the first power mechanism 4. The first power mechanism 4 is coaxially rotatably embedded in the egg holding tube 2. The first power mechanism 4 includes a direction-changing component 41 and a spoiler component 42. The inner circumference of the direction-changing component 41 is evenly provided with a plurality of air flow channels, which convert the axial airflow delivered by the aeration pipe 22 into a radial airflow and deliver it to the inner bottom of the egg holding tube 2, and the air flow channel uses the power brought by the airflow to enable the direction-changing component 41 to have rotational potential energy. The spoiler component 42 is coaxially fixed to the bottom side of the direction-changing component 41, and the spoiler component 42 is between the inner bottom of the hatching tube 1 and the bottom side of the egg holding tube 2. The spoiler component 42 rotates with the direction-changing component 41 and causes the water therein to be agitated.

[0026] In addition, the in vitro incubation device for crayfish eggs according to the embodiment of the present application also has the following additional technical features: Among them Figure 4-Figure 6 As shown, a limit ring 101 is coaxially fixed on the outer wall of the hatching tube 1, and the limit ring 101 is used to limit the position of the overflow tube 3. It can be understood that when the overflow tube 3 is sleeved on the outside of the hatching tube 1, it can and can only be moved to the limit ring 101.

[0027] At least two symmetrical limit blocks 102 are arranged on the inner wall of the hatching tube 1, and at least two hanging ears 203 are symmetrically arranged on the outer wall of the egg holding tube 2. A pin shaft 204 is fixedly connected to the hanging ear 203, and the pin shaft 204 is slidably inserted in the limit block 102. It can be understood that the egg holding tube 2 is inserted in the limit block 102 through the pin shaft 204, so that the descending position of the egg holding tube 2 in the hatching tube 1 is limited, and the rotation is interfered. It should be noted that in the specific embodiment of the present application, the length setting of the pin shaft 204 needs to be able to extend a part from the bottom end of the limit block 102 after being inserted into the limit block 102.

[0028] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the holes connected to the external water body provided at the bottom end of the bottom plate 11 and the side wall of the hatching tube 1 are respectively the axial connecting hole 111 and the radial connecting hole 13. It can be seen that when the hatching tube 1 is placed in water, the water will enter from the radial connecting hole 13 and pass through the axial connecting hole 111 into the hatching tube 1, so that the liquid level inside the hatching tube 1 is consistent with the liquid level outside.

[0029] like Figure 2 , Figure 3 and Figure 7As shown, the inner bottom of the egg-holding tube 2 is set in a conical shape. It can be understood that the setting of the conical bottom will make the shrimp eggs thereon have the effect of converging toward the axis in a static state. In this way, when the air flow is ejected to drive the water flow to move, the shrimp eggs can be prevented from accumulating on the outer side of the inner bottom of the egg-holding tube 2. Under the action of the shrimp eggs' own weight, the shrimp eggs approach the axis. Under the action of the water flow, the shrimp eggs have a tendency to move radially from the inside to the outside. In this way, the shrimp eggs will not form an accumulation shape, which can ensure that the environment where the shrimp eggs are located and the environment where the shrimp eggs are located at the abdominal appendages of the parent shrimp are The environments are similar (both have water flow), and the holes for the water body to pass through the conical inner bottom are axial through holes 201, which are evenly distributed on the inner bottom of the egg holding tube 2. The existence of the axial through holes 201 will allow the water outside the egg holding tube 2 to enter the egg holding tube 2. At the same time, it can be understood that when the airflow transported from the aeration pipe 22 is radially ejected under the action of the redirecting component 41, the axial through holes 201 on the conical bottom will more or less allow part of the airflow to escape from the inner bottom of the egg holding tube 2 to the bottom side of the egg holding tube 2.

[0030] Among them, the holes for the water body to pass through arranged on the side wall of the egg holding tube 2 are radial through holes 202, and the radial through holes 202 are evenly arranged in the circumferential direction on the upper half of the side wall of the egg holding tube 2. It should be noted that the radial through holes 202 are arranged in the upper half of the side wall of the egg holding tube 2, so that the water flow inside and outside the egg holding tube 2 at the radial through holes 202 can be relatively slow, especially avoiding the violent flow of the water body inside the egg holding tube 2, which causes good eggs (active eggs) to drill out from the upper cover plate 21.

[0031] like Figure 1-Figure 3 As shown, the overflow tube 3 is arranged in an annular shape, the top of the annular overflow tube 3 is open, and the top of the outer wall of the overflow tube 3 is higher than the top of the inner wall. An overflow chamber 31 is arranged inside the overflow tube 3, and a plurality of through holes 32 are arranged on the outer wall and the bottom of the overflow tube 3 to connect the overflow chamber 31 with the external water. It can be understood that the top of the outer side of the overflow tube 3 is higher than the top of the inner side, which can block the bad eggs overflowing from the overflow port 12 to prevent the bad eggs from being unable to be collected, and the through holes 32 arranged on the outer wall and the bottom of the overflow tube 3 can allow the water overflowing from the hatching tube 1 to enter the water container, and cooperate with the water in the water container to enter the hatching tube 1 from the bottom side of the hatching tube 1, so that the water in the hatching tube 1 and the water in the water container form a circulation, so as to avoid the formation of dead water in the hatching tube 1 during the hatching process, and then inhibit the generation of pathogens on the shrimp eggs to a certain extent.

[0032] like Figure 3 and 8As shown, the direction-changing component 41 includes a top guide member 411, a plurality of arc-shaped plates 412 and a bottom guide member 413. The top guide member 411 is rotatably sleeved on the aeration tube 22; a plurality of arc-shaped plates 412 are evenly fixed on the bottom side of the top guide member 411 in the circumferential direction; the bottom guide member 413 is coaxially fixed on the bottom side of the plurality of arc-shaped plates 412; the plurality of arc-shaped plates 412 form a plurality of airflow channels between the top guide member 411 and the bottom guide member 413, and the plurality of airflow channels are in an arc shape with a bottom portion being larger than a top portion. It should be noted that, in a specific embodiment of the present application, the bottom guide member 413 is rotatably embedded in the inner bottom portion of the egg-containing tube 2, which can further be understood. It is understood that the airflow transported from the aeration pipe 22 will change direction after entering between the top guide piece 411 and the bottom guide piece 413, and will eventually be ejected from multiple airflow channels, and the multiple airflow channels are arranged in an arc shape, and the bottom is larger than the top. In this way, the flow velocity of the airflow therein will be increased, and the rotational potential energy of the entire changing component 41 will be further enhanced, and then the changing component 41 will rotate under the action of the airflow. In this way, it can be further understood that the airflow ejected from the changing component 41 will be ejected in a rotating state, so as to evenly blow the shrimp eggs at the bottom of the entire egg holding tube 2 and avoid dead corners.

[0033] Furthermore, a first annular curved surface 414 is provided on the bottom side of the top guide member 411, and the first curved surface 414 is upwardly inclined from the axis center to the outside; a second annular curved surface 415 is provided on the upper side of the bottom guide member 413, and the second curved surface 415 is upwardly inclined from the axis center to the outside; a plurality of curved plates 412 are evenly fixed circumferentially between the first curved surface 414 and the second curved surface 415 to form an arc-shaped airflow channel with a larger bottom and a smaller top.

[0034] Furthermore, an arc-shaped protrusion 416 is provided on the upper side of the bottom guide member 413, and the arc-shaped protrusion 416 is located on the inner side of the second arc-shaped surface 415. It can be understood that the design of the arc-shaped protrusion 416 will enable the axially delivered airflow to be evenly diverted to the inside of multiple airflow channels.

[0035] A conical surface 417 is provided on the top side of the top guide member 411. It can be understood that it is more difficult for shrimp eggs to accumulate on the upper end surface of the top guide member 411 during the rotation process, thereby preventing the shrimp eggs from rolling in a local area inside the entire egg-containing tube 2 due to the flow of water driven by the airflow.

[0036] like Figure 8 and 9 As shown, a plurality of first spoilers 421 are evenly arranged circumferentially on the bottom side of the spoiler assembly 42, and a plurality of second spoilers 422 are evenly arranged circumferentially on the top side of the spoiler assembly 42. The second spoilers 422 are slidably matched with the egg holding tube 2 and the bottom end of the redirection assembly 41.

[0037] The first spoiler 421 is arranged in an arc shape and gradually expands from the axis to the outside. An arc channel 423 is formed between the first spoilers 421. The two arc side surfaces of the first spoiler 421 are a third arc surface 424 and a fourth arc surface 425 respectively.

[0038] It can be understood that when the entire spoiler assembly 42 rotates following the change-of-direction assembly 41, the first spoiler 421 and the second spoiler 422 on the top and bottom sides thereof will drive the water body to rotate outside the egg holding tube 2, and the gas escaping therefrom will be refined due to the rotation of the water body, that is, the oxygen content of the water body will be increased, and at the same time, the refined gas will eventually escape from the outside of the egg holding tube 2 and burst on the water surface. It should be noted that the disturbance of the water body at the bottom end of the egg holding tube 2 can prevent bubbles from accumulating on the bottom side of the egg holding tube 2 and being unable to rise to the water surface, and at the same time, prevent the water body outside the egg holding tube 2 from being unable to enter the inside of the egg holding tube 2 due to the accumulation of bubbles on the bottom side of the egg holding tube 2.

[0039] On the other hand, the present application also provides a method for in vitro hatching of crayfish eggs, comprising the following steps: S1: Water treatment, method 1, select water in the living environment of parent shrimps, and place it in an incubation tank or other related water container, and put a heating rod in the container to keep the water temperature at 18°C-20°C, and inject a certain amount of gentamicin into the water; method 2, select clean water in the incubation container that has been oxygenated or dried in the sun for 24 hours in advance, the water body needs to maintain a temperature of 18°C-20°C, and inject a certain amount of gentamicin into the water body; it should be noted that in the specific embodiment of the present application, injecting a certain amount of gentamicin into the water body can effectively produce antibacterial effects by inhibiting the synthesis of bacterial proteins, reduce the occurrence of shrimp egg pathological phenomena, and at the same time aggravate the death of bacteria in the water body, and to a certain extent inhibit the occurrence of "water mold" phenomenon in shrimp eggs.

[0040] S2: taking eggs, taking the eggs from the abdominal appendages of the parent shrimp, and placing the eggs in an egg-holding tube 2, embedding the egg-holding tube 2 in the hatching tube 1, and placing the hatching tube 1 in the water body in the hatching container, with the upper cover plate 21 located underwater, the water surface located between the overflow ports 12, and continuously injecting air into the bottom of the egg-holding tube 2 by using an aeration pipe 22 connected to an external air supply device; S3: hatching, after the aeration pipe 22 continuously injects air into the bottom of the egg-containing tube 2, the airflow enters the direction-changing component 41 and turns, and is radially ejected from the side wall of the direction-changing component 41 toward the bottom of the egg-containing tube 2. Under the power of the airflow, the direction-changing component 41 and the flow-disturbing component 42 are synchronously rotated, and the airflow drives the water body to roll in the egg-containing tube 2 and forms a certain degree of rotation after being ejected; part of the airflow enters between the bottom side of the egg-containing tube 2 and the hatching tube 1 at the bottom of the egg-containing tube 2, and rises from the outer side of the side wall of the egg-containing tube 2 and the inner wall of the hatching tube 1 to the water surface and breaks under the rotation of the flow-disturbing component 42; the shrimp eggs located at the bottom of the egg-containing tube 2 begin to roll in the egg-containing tube 2 under the tumbling action of the water body driven by the airflow; S4: Remove bad eggs. When the eggs in incubation are tumbling in the egg-holding tube 2, the eggs with vitality and the eggs without vitality will be separated in the tumbling process. Due to the difference in quality, the bad eggs without vitality will tumble more significantly, and the good eggs with vitality will tumble less significantly. After rising to the upper cover plate 21, the bad eggs that tumbled significantly enter the upper side of the upper cover plate 21 through the screening hole 211. Under the action of the airflow that rises to the water surface between the outer side of the side wall of the egg-holding tube 2 and the inner wall of the hatching tube 1, and the action of the water body between the outer side of the side wall of the egg-holding tube 2 and the inner wall of the hatching tube 1 caused by the rotation of the spoiler assembly 42, the bad eggs that enter the upper side of the upper cover plate 21 will tumble with the water body and enter the overflow tube 3 from the overflow port 12; S5: Discard bad eggs in time. During the hatching process, if bad eggs are found in the overflow tube 3, take out the overflow tube 3 in time, remove the bad eggs inside, and then put them back into the hatching tube 1 until the shrimp eggs in the egg tube 2 are hatched into crayfish seedlings; S6: The seedlings should be kept in a resting state in the initial stage. The hatched seedlings should be kept in the hatching water for a period of time. They do not need to be fed during this period, but oxygen should be added to the water. The yolk on the seedlings should be observed at any time until the yolk disappears. Then they can be transferred to the breeding water and fed with algae or small plankton for normal breeding.

[0041] The following describes the use process of a crayfish egg in vitro hatching device according to an embodiment of the present application with reference to the accompanying drawings: When in use, refer to the above-mentioned hatching method, after the shrimp eggs are taken from the abdomen of the parent shrimp, they are placed at the bottom of the egg-holding tube 2, and the upper cover plate 21 is covered on the top of the egg-holding tube 2 and axially positioned. When hatching, the water temperature is maintained at 18-20°C, not exceeding 28°C (it should be noted here that within a reasonable temperature range, the higher the temperature, the shorter the hatching time, but the faster the bacteria grow), the liquid level in the water container is located between the overflow ports 12 (higher than the highest point of the upper cover plate 21), so that the water inside the hatching tube 1 can overflow into the overflow tube 3. When hatching, aeration needs to be maintained for a long time (that is, the airflow is continuously pumped into the aeration pipe 22), and the airflow is from the aeration pipe 22 axis. After entering the redirection assembly 41, it is radially ejected toward the bottom of the egg-containing tube 2, and under the action of the airflow, the redirection assembly 41 and the spoiler assembly 42 below it are driven to rotate synchronously in the same direction. First, the rotation of the redirection assembly 41 causes the ejected airflow to drive the water body to rotate and roll inside the egg-containing tube 2. In this way, the shrimp eggs therein will form the same roll under the movement of the water body, so that the shrimp eggs are separated, and the annular protrusion of the upper cover plate 21 will further enhance the tumbling of the water body. At the same time, because the quality of the active shrimp eggs and the inactive shrimp eggs is different (the inactive shrimp eggs may be lighter than the active shrimp eggs due to moldy, shriveled, etc.), the shrimp eggs will roll in the process of rolling. During the process, the tumbling amplitude of the inactive shrimp eggs will be greater than that of the active shrimp eggs, so the inactive shrimp eggs will gradually pass through the screening hole 211 with the tumbling of the water flow. It should be noted that the air supply device connected to the aeration pipe 22 can be an air pump with adjustable air volume, so that the active shrimp eggs will not flow out of the egg-containing tube 2 by adjusting the air volume; secondly, due to the rotation of the spoiler component 42, the water body at the bottom side of the egg-containing tube 2 will be driven to rotate. The rotation of the water body will firstly prevent the escaping gas from forming large bubbles at the axial through hole 201 to cause blockage, and secondly, the escaping gas will be further broken up to increase the oxygen content of the water body, and the rotation of the water body will also cause the liquid surface to shake to a certain extent, thereby enhancing The bad eggs drilled out from the egg holding tube 2 overflow into the overflow tube 3 efficiently. During the hatching process, the staff maintains the observation frequency and regularly pours out the bad eggs collected in the overflow tube 3 in time to prevent the bad eggs from damaging the water quality in the water body for a long time. Therefore, the design of the present application can effectively remove the bad eggs in time, and ensure the oxygen content of the water body and the water flow required for the hatching of shrimp eggs, avoid the dead water area in the water body, cause a large number of bacteria to breed, and affect the hatching rate of shrimp eggs. At the same time, the hatched seedlings are kept in the hatching water body, which can effectively avoid the large-scale death of shrimp seedlings due to large fluctuations in water quality, and effectively avoid the invasion of shrimp seedlings by external natural enemies, thereby improving the survival rate of shrimp seedlings to a certain extent.

[0042] Embodiment 2, in the related art, the water inside the egg-containing tube 2 is tumbled only by the airflow delivered by the aeration pipe 22. Due to various factors such as the height and diameter of the egg-containing tube 2, the shrimp eggs at a certain position will tumble less with the water, that is, more or less some shrimp eggs will not be able to tumble fully, which will lead to a decrease in the hatching rate of these shrimp eggs.

[0043] According to some embodiments of the present application, Figure 2 , Figure 10-12 As shown, a second power mechanism 5 is coaxially arranged between the spoiler assembly 42 and the base plate 11, and the second power mechanism 5 includes an elastic assembly 51, a plurality of levers 52 and a plurality of undulating members 53. The elastic assembly 51 includes a fixed end and a telescopic end elastically plugged into the fixed end. The fixed end of the elastic assembly 51 is coaxially fixed to the bottom side of the spoiler assembly 42, and the telescopic end of the elastic assembly 51 is coaxially abutted against the upper end surface of the base plate 11; a plurality of levers 52 are circumferentially uniformly fixedly sleeved on the fixed end of the elastic assembly 51; a plurality of undulating members 53 are circumferentially uniformly fixed to the base plate 11, and the plurality of undulating members 53 are intermittently contacted with the plurality of levers 52, respectively.

[0044] It can be understood that when the fixed end of the elastic component 51 rotates with the spoiler component 42, it will drive the multiple levers 52 to rotate, and then the levers 52 will touch the multiple undulating members 53 one by one. Under the action of the undulating members 53, the levers 52 will be forced to drive the fixed end of the elastic component 51 to undergo axial displacement. In this way, it can be understood that the spoiler component 42 during the rotation will intermittently drive the entire egg holding tube 2 to undergo axial displacement in the up and down directions. In this way, the exchange of water inside the egg holding tube 2 and the water outside will be further accelerated. At the same time, the water inside the egg holding tube 2 will roll without dead ends, thereby preventing the local shrimp eggs from rolling too small and affecting normal hatching.

[0045] Furthermore, the elastic component 51 includes a positioning cylinder 511, a sliding pin 512 and an elastic member 513. The positioning cylinder 511 is the fixed end of the elastic component 51, and the positioning cylinder 511 is fixedly connected to the spoiler component 42; the sliding pin 512 is the telescopic end of the elastic component 51, and the sliding pin 512 is limitedly slidably inserted in the positioning cylinder 511; one end of the elastic member 513 abuts against the inner top of the positioning cylinder 511, and the other end of the elastic member 513 abuts against the sliding pin 512.

[0046] It can be understood that the elastic member 513 can ensure that the sliding pin 512 is always in contact with the bottom plate 11, and can provide a certain buffer for the axial displacement occurring at the positioning cylinder 511, thereby preventing the egg holding cylinder 2 from rising and falling too strongly (of course, the rotation speed of the direction changing component 41 and the spoiler component 42 also affects the frequency of the up and down fluctuation of the egg holding cylinder 2).

[0047] The plurality of levers 52 are evenly fixed to the circumference of the clamping ring 521 , and the clamping ring 521 is fixedly sleeved on the positioning tube 511 .

[0048] Furthermore, the undulating member 53 includes a protruding portion 531 and a latch portion 532 , wherein the protruding portion 531 extends out of the upper end surface of the bottom plate 11 , and the latch portion 532 is coaxially fixed to the bottom side of the protruding portion 531 and is damped and plugged into the bottom plate 11 .

[0049] Furthermore, the upper end surface of the protrusion 531 is arranged in an axisymmetric manner, and the upper end surface of the protrusion 531 is arranged in an arc-shaped protrusion shape, and the arc-shaped protrusion includes a first slope surface 533 and a second slope surface 534 .

[0050] When the airflow drives the direction-changing component 41 and the spoiler component 42 to rotate, the positioning tube 511 will be synchronously driven to rotate, and then the clamping ring 521, that is, the multiple levers 52 on its peripheral side, will be driven to rotate. The rotating multiple levers 52 will touch the undulating member 53 one by one. When the lever 52 moves from the first slope 533 to the top of the second slope 534, the entire egg holding tube 2 is in an ascending state. When the lever 52 moves from the top of the second slope 534 to the first slope 533, the entire egg holding tube 2 is in a descending state. When the lever 52 does not touch the undulating member 53, the entire egg holding tube 2 maintains axial positioning. In this way, during the hatching process, the entire egg holding tube 2 will be displaced up and down intermittently, and the airflow will be sprayed from the rotating direction-changing component 41 to the bottom of the egg holding tube 2, which will accelerate the exchange of water in the entire egg holding tube 2 and the external water body, and form a rolling without dead angles. In this way, the rolling efficiency of the shrimp eggs in the egg holding tube 2 will be improved, and the hatching efficiency of the shrimp eggs therein will be guaranteed.

[0051] Embodiment 3, in the related art, the tumbling of the water inside the egg-holding tube 2 drives the shrimp eggs to tumble, and the tumbling is used to separate the good eggs from the bad eggs. However, once some shrimp eggs have "water mold", flocs will grow on their surface, which makes it easy for the bad eggs and the good eggs to stick together. The sticky shrimp eggs may not be separated by tumbling alone. Therefore, once "water mold" appears, it will be difficult for the shrimp eggs to separate and cause large-scale damage.

[0052] According to some embodiments of the present application, Figure 1 , Figure 2 , Figure 13-Figure 15As shown, an auxiliary component 6 is coaxially sleeved on the aeration pipe 22, and the auxiliary component 6 includes a sleeve 61 with a top seal and a spiral strip 62. The sleeve 61 is fixedly inserted in the upper cover plate 21, and the sleeve 61 and the aeration pipe 22 are coupled. A plurality of holes are evenly arranged on the side wall of the aeration pipe 22 (not shown in the figure, but it can be understood that the sleeve 61 and the aeration pipe 22 are connected through the plurality of holes on the side wall of the exhaust pipe 22), and the sleeve 61 extends to the upper end surface of the redirecting component 41 (it should be noted that the sleeve 61 and the deformation component 41 are only in abutment state), and the spiral strip 62 is coaxially fixed to the inner wall of the sleeve 61, and the spiral strip 62 and the aeration pipe 22 are coupled.

[0053] It is understandable that the coupling of the sleeve 61 and the aeration tube 22 and the coupling of the spiral strip 62 and the aeration tube 22 will allow the upper cover plate 21 to be removed normally from the aeration tube 22, while forming the sleeve 61 and the upper cover plate 21 into an integral shape.

[0054] Furthermore, a plurality of injection holes 611 are evenly arranged on the side wall of the sleeve 61 . The plurality of injection holes 611 are arranged in a spiral shape on the sleeve 61 , and the spiral shape of the plurality of injection holes 611 is consistent with the spiral parameters of the spiral strip 62 .

[0055] The injection hole 611 is upwardly oriented from the inside to the outside along the radial direction of the sleeve 61 .

[0056] Thus, it can be understood that when the gas is transported in the aeration pipe 22, part of the airflow will enter the sleeve 61 through the multiple holes on the side wall of the aeration pipe 22, and finally be ejected from the injection hole 611, and the flow of the airflow in the sleeve 61 will form a spiral rotation under the action of the spiral strip 62, so that the airflow will first be uniformed in the sleeve 61, and at the same time, the spiral strip 62 will be forced to drive the sleeve 61 to rotate, and then drive the upper cover plate 21 installed on the top of the egg tube 2 to rotate. It should be noted that, first of all, the airflow is uniformly ejected from the multiple injection holes 611 in the sleeve 61, and the ejection direction is inclined upward, and the ejected airflow will rotate due to the rotation of the sleeve 61, and because of the multiple injection holes 611 is arranged in a spiral shape, so a multi-layer rotating small jet airflow will be formed inside the entire egg-containing tube 2, so that multiple impacts will be further caused to the tumbling shrimp eggs, and the separation effect between good and bad eggs will be improved. In addition, due to the direction design of the airflow ejected from the sleeve 61, the efficiency of the bad eggs drilling out from the upper cover plate 21 can be further accelerated. Secondly, because the sleeve 61 drives the upper cover plate 21 to rotate at the top of the egg-containing tube 2, the screening hole 211 will rotate with the upper cover plate 21, forming a certain degree of cutting effect on the water body. In this way, a certain degree of cutting and separation effect can be formed on the flocs on the bad eggs that are displaced to the bottom side of the upper cover plate 21, avoiding the existence of flocs on the bad eggs that are not separated from the good eggs to affect the normal hatching of the good eggs.

[0057] It should be noted that the specific model and specifications of the elastic member 513 need to be selected and determined according to the actual specifications of the device, and the specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail.

[0058] The above are only preferred implementations of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A crayfish egg in vitro hatching device, comprising a hatching tube (1), characterized in that: The bottom of the incubation tube (1) is coaxially fixedly connected to a bottom plate (11); the bottom plate (11) and the bottom end of the side wall of the incubation tube (1) are both provided with holes communicating with external water bodies; and the upper part of the side wall of the incubation tube (1) is circumferentially provided with a plurality of overflow ports (12); The hatching cylinder (1) is embedded with an egg-holding cylinder (2), the bottom and side walls of the egg-holding cylinder (2) are provided with holes for water to pass through, the top of the egg-holding cylinder (2) is rotatably connected to an upper cover plate (21), the upper cover plate (21) is arranged in an annular raised manner, a plurality of screening holes (211) are evenly arranged on the upper cover plate (21), an aeration pipe (22) is coaxially rotatably plugged on the upper cover plate (21), the aeration pipe (22) is externally connected to an air supply device, and the aeration pipe (22) extends to the inner bottom of the egg-holding cylinder (2); An overflow tube (3) is sleeved on the outer wall of the hatching tube (1), the overflow tube (3) is located at the bottom side of the overflow port (12), and the interior of the overflow tube (3) is in communication with an external water body; The aeration pipe (22) extends to one end of the inner bottom of the egg-containing cylinder (2) and is rotatably connected to a first power mechanism (4). The first power mechanism (4) is coaxially rotatably embedded in the egg-containing cylinder (2). The first power mechanism (4) comprises a direction-changing component (41) and a flow-disturbing component (42). A plurality of airflow channels are evenly arranged in the inner circumference of the direction-changing component (41). The airflow channels convert the axial airflow delivered by the aeration pipe (22) into radial airflow and deliver it to the inner bottom of the egg-containing cylinder (2). The airflow channels use the power brought by the airflow to enable the direction-changing component (41) to have rotational potential energy. The flow-disturbing component (42) is coaxially fixed to the bottom side of the direction-changing component (41). The flow-disturbing component (42) is located between the inner bottom of the hatching cylinder (1) and the bottom side of the egg-containing cylinder (2). The flow-disturbing component (42) rotates with the direction-changing component (41) and causes the water therebetween to be agitated.

2. The in vitro incubation device for crayfish eggs according to claim 1, characterized in that: A limiting ring (101) is coaxially fixedly connected to the outer wall of the incubation cylinder (1), and the limiting ring (101) is used to limit the position of the overflow cylinder (3); At least two symmetrical limit blocks (102) are arranged on the inner wall of the hatching tube (1), and at least two hanging ears (203) are symmetrically arranged on the outer wall of the egg holding tube (2). A pin shaft (204) is fixedly connected to the hanging ears (203), and the pin shaft (204) is slidably plugged into the limit blocks (102).

3. The in vitro incubation device for crayfish eggs according to claim 1, characterized in that: The holes provided at the bottom end of the bottom plate (11) and the side wall of the hatching tube (1) and communicating with the external water body are respectively an axial communication hole (111) and a radial communication hole (13).

4. The in vitro incubation device for crayfish eggs as claimed in claim 1, characterized in that: The inner bottom of the egg-containing cylinder (2) is arranged in a conical shape, and the holes provided on the conical inner bottom through which the water body passes are axial through holes (201), and the axial through holes (201) are evenly distributed on the inner bottom of the egg-containing cylinder (2), and the holes provided on the side wall of the egg-containing cylinder (2) through which the water body passes are radial through holes (202), and the radial through holes (202) are evenly arranged in the circumferential direction on the upper half of the side wall of the egg-containing cylinder (2).

5. The in vitro incubation device for crayfish eggs as claimed in claim 1, characterized in that: The overflow tube (3) is arranged in an annular shape, the top of the annular overflow tube (3) is open, and the top of the outer wall of the overflow tube (3) is higher than the top of the inner wall. An overflow chamber (31) is arranged inside the overflow tube (3), and the outer wall and the bottom of the overflow tube (3) are both provided with a plurality of through holes (32) so that the overflow chamber (31) communicates with the external water body.

6. The in vitro incubation device for crayfish eggs according to claim 1, characterized in that: The direction-changing component (41) comprises: A top flow guide (411), the top flow guide (411) being rotatably sleeved on the aeration pipe (22); A plurality of arc-shaped plates (412), wherein the plurality of arc-shaped plates (412) are evenly fixedly arranged in the circumferential direction on the bottom side of the top flow guide member (411); A bottom flow guide (413), the bottom flow guide (413) being coaxially fixed to the bottom sides of the plurality of arc-shaped plates (412); The plurality of arc-shaped plates (412) form a plurality of airflow channels between the top airflow guide (411) and the bottom airflow guide (413), and the plurality of airflow channels are in an arc shape with the bottom being larger than the top.

7. The in vitro incubation device for crayfish eggs as claimed in claim 6, characterized in that: A first annular arc surface (414) is provided on the bottom side of the top flow guide (411), and the first arc surface (414) rises from the axis to the outside; An annular second arc surface (415) is provided on the upper side of the bottom flow guide (413), and the second arc surface (415) rises from the axis to the outside; The plurality of arc-shaped plates (412) are evenly fixed in the circumferential direction between the first arc-shaped surface (414) and the second arc-shaped surface (415); An arc-shaped protrusion (416) is provided on the upper side of the bottom flow guide (413), and the arc-shaped protrusion (416) is located on the inner side of the second arc-shaped surface (415); A conical surface (417) is provided on the top side of the top flow guide (411).

8. The in vitro incubation device for crayfish eggs as claimed in claim 1, characterized in that: A plurality of first spoilers (421) are evenly arranged around the bottom side of the spoiler assembly (42), and a plurality of second spoilers (422) are evenly arranged around the top side of the spoiler assembly (42). The second spoilers (422) are slidably fitted with the bottom end of the egg holding tube (2).

9. The in vitro incubation device for crayfish eggs as claimed in claim 8, characterized in that: The first spoiler (421) is arranged in an arc shape, and the first spoiler (421) gradually expands from the axis to the outside, and an arc channel (423) is formed between the plurality of first spoilers (421), and the two arc side surfaces of the first spoiler (421) are respectively a third arc surface (424) and a fourth arc surface (425).

10. A method for in vitro hatching of crayfish eggs, characterized in that: The device for in vitro hatching of crayfish eggs according to any one of claims 1 to 9 comprises the following steps: S1: Water treatment: Method 1: Select water in the living environment of parent shrimps and place it in an incubation tank or other related water container, and put a heating rod in the container to keep the water temperature at 18℃-20℃, and inject a certain amount of gentamicin into the water; Method 2: Select clean water in the incubation container that has been oxygenated or dried in the sun for 24 hours, and keep the water temperature at 18℃-20℃, and inject a certain amount of gentamicin into the water; S2: Retrieving eggs, removing shrimp eggs from the abdominal appendages of the parent shrimp, and placing the shrimp eggs in an egg-holding tube (2), embedding the egg-holding tube (2) in the incubation tube (1), and placing the incubation tube (1) in the water body in the incubation container, with the upper cover plate (21) located underwater and the water surface located between the overflow ports (12), and continuously injecting air into the bottom of the egg-holding tube (2) by connecting an aeration pipe (22) to an external air supply device; S3: hatching, after the aeration pipe (22) continuously injects air into the bottom of the egg-holding tube (2), the airflow enters the direction-changing component (41) and turns, and is radially ejected from the side wall of the direction-changing component (41) toward the bottom of the egg-holding tube (2). Under the power of the airflow, the direction-changing component (41) and the flow-disturbing component (42) are synchronously rotated, and after the airflow is ejected, the water body in the egg-holding tube (2) is driven to roll and form a certain degree of rotation; part of the airflow at the bottom of the egg-holding tube (2) enters between the bottom side of the egg-holding tube (2) and the hatching tube (1), and under the rotation of the flow-disturbing component (42), the airflow rises from the outer side of the side wall of the egg-holding tube (2) and the inner wall of the hatching tube (1) to the water surface and breaks; the shrimp eggs located at the bottom of the egg-holding tube (2) begin to roll in the egg-holding tube (2) under the rolling action of the water body driven by the airflow; S4: bad eggs are removed. When the eggs in incubation are tumbling in the egg holding tube (2), the eggs with vitality and the eggs without vitality will be separated during the tumbling process. Due to the difference in quality, the bad eggs without vitality will tumble to a greater extent, while the good eggs with vitality will tumble to a lesser extent. The bad eggs that have tumbled to a greater extent will rise to the upper cover plate (21) and enter the upper side of the upper cover plate (21) through the screening hole (211). Under the influence of the airflow that breaks up between the outer side of the side wall of the egg holding tube (2) and the inner wall of the incubation tube (1) and rises to the water surface, and the water body between the outer side of the side wall of the egg holding tube (2) and the inner wall of the incubation tube (1) is disturbed by the rotation of the spoiler component (42). The bad eggs that have entered the upper side of the upper cover plate (21) will tumble with the water body and enter the overflow tube (3) from the overflow port (12); S5: Discard bad eggs in time. During the hatching process, if bad eggs are found in the overflow tube (3), take out the overflow tube (3) in time, remove the bad eggs inside, and then put it back into the hatching tube (1) until the shrimp eggs in the egg-holding tube (2) are hatched into crayfish seedlings; S6: The seedlings should be kept in a resting state in the initial stage. The hatched seedlings should be kept in the hatching water for a period of time. They do not need to be fed during this period, but oxygen should be added to the water. The yolk on the seedlings should be observed at any time until the yolk disappears. Then they can be transferred to the breeding water and fed with algae or small plankton for normal breeding.

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