A crayfish hatching and collection device
By designing a crayfish hatching and collection device, and using a limiting net and buoyancy structure to separate adult crayfish from larvae, the device achieves efficient collection of larvae and improves their survival rate, solving the problem of missed larvae capture and optimizing the management of the aquaculture process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SOUTH CHINA AGRICULTURAL UNIVERSITY
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-03
AI Technical Summary
Existing methods for collecting shrimp larvae are prone to missed catches and make it difficult to effectively separate adult shrimp from larvae, thus affecting the survival rate and yield of larvae.
Design a crayfish hatching and collection device, including a rearing box, a limiting net, and an adult shrimp tank. The limiting net is detachably connected to the rearing box. The adult shrimp tank is made to float by a buoyancy structure, which separates the adult shrimp from the shrimp larvae. The shrimp larvae swim out through the shrimp larvae passage, while the adult shrimp are confined inside the tank, thus achieving centralized collection of the shrimp larvae.
This improved the efficiency of shrimp larvae collection, reduced the rate of missed catches, enhanced the survival rate of shrimp larvae, and optimized the breeding conditions by allowing real-time observation of the shrimp larvae's condition through transparent tanks, thereby increasing the hatching rate and survival rate.
Smart Images
Figure CN224440080U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of aquaculture technology, and more specifically, to a crayfish hatching and collection device. Background Technology
[0002] Redclaw crayfish, also known as redclawed smooth-shelled lobster or Australian freshwater crayfish, is one of the world's most prized freshwater shrimp species. It is highly favored by farmers and consumers due to its large size, high meat yield, strong adaptability, rapid growth, and delicious flavor. Redclaw crayfish are multi-spawning animals; under normal farming conditions, they can spawn more than three times a year. In suitable aquatic environments, they can reproduce almost year-round.
[0003] Redclaw crayfish are omnivorous, and adult crayfish will prey on newly hatched or molting weak larvae, especially soft-shelled larvae that have just completed molting, which are extremely vulnerable to attack, resulting in a significant reduction in larval productivity. Therefore, it is necessary to separate larvae from spawning adults in a timely manner during the farming process. Current larvae collection methods mainly involve placing berried crayfish in the hatching pond. After berried crayfish lay their larvae, the larvae take refuge in a shrimp-attracting device due to their attraction to darkness, and the larvae are collected through this device. However, because larvae easily disperse at the bottom of the pond or in the gaps of the shrimp-attracting device, the rate of missed collection is high, and larvae are easily left in the hatching pond and preyed upon by adult crayfish, leading to a decrease in productivity. Furthermore, it is difficult to observe the condition of berried crayfish and the hatching progress of larvae, which is not conducive to efficient management during the farming process. Utility Model Content
[0004] To address the problem of shrimp larvae being easily missed in the existing technology, this utility model provides a crayfish hatching and collection device, which can prevent shrimp larvae from being missed and improve the efficiency of shrimp larvae collection.
[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:
[0006] A crayfish hatching and collection device includes a rearing box, a limiting net, and multiple adult crayfish tanks. The rearing box is equipped with a water tank and a drain outlet, and the limiting net is detachably connected to the rearing box. Each adult crayfish tank includes a tank body and a sealing cap. The tank body is equipped with a buoyancy structure and also has an spawning chamber, an adult crayfish inlet, and multiple larvae inlets. The spawning chamber is connected to the water tank through the adult crayfish inlet and the larvae inlets. The sealing cap is detachably installed on the adult crayfish inlet. Each adult crayfish tank is located below the limiting net.
[0007] The connection between the sealing cap and the tank body can be a snap-fit connection, a threaded connection, or a connection through additional connectors; the connection between the limiting net and the incubator can be a snap-fit connection, a sliding connection, or a connection through additional connectors; the buoyancy structure can be an annular float such as EPE foam and PVC floats fitted outside the tank body, an ordinary float bonded to the outside of the tank body, or a sealed air cavity set inside the tank body, etc.
[0008] In use, the above-mentioned technical solution involves opening the sealed lid, placing the berried shrimp into the spawning chamber of the tank through the adult shrimp opening, and then closing the sealed lid. The tank is then placed in a water tank, and the retaining net is reinstalled. Water is then added to the tank until it covers the retaining net. The buoyancy of the structure keeps the tank afloat and in contact with the retaining net, ensuring the tank is submerged. After spawning, the larvae remain temporarily in the mother's abdomen and are expelled after approximately 7 days. Because the larvae have an innate instinct to avoid predators, they swim out of the tank through the larva opening after expelling their mother, while the adult shrimp, being larger, are confined inside and cannot prey on the larvae. When collecting the larvae, the retaining net is removed, allowing the adult shrimp tank to float to the surface. The adult shrimp tank is then removed, and the adult shrimp are taken out. Finally, the drain is opened, allowing the larvae and water in the tank to drain out, thus collecting the larvae. Compared to the existing method of collecting shrimp larvae using shrimp houses, the above-mentioned technical solution can export all shrimp larvae at once, avoiding the loss of shrimp larvae and greatly improving the collection efficiency of shrimp larvae. Moreover, the separation of adult shrimp and shrimp larvae by the tank can reduce the contact between adult shrimp and shrimp larvae, which is conducive to improving the survival rate of shrimp larvae.
[0009] Preferably, the drain outlet is located at the bottom of the water tank, and a water level maintaining pipe is detachably connected to the drain outlet. The water level maintaining pipe is located inside the water tank and passes through the limiting net, with its top opening above the limiting net. It is understood that the water level maintaining pipe prevents all the water in the water tank from flowing out, maintaining the water level at the position of its top opening. When it is necessary to discharge the shrimp larvae, the water level maintaining pipe is removed, allowing the shrimp larvae and water in the water tank to drain out through the drain outlet.
[0010] The connection between the water level maintaining pipe and the drain outlet can be a plug-in connection, a threaded connection, or a connection through an additional connector.
[0011] Preferably, the top opening of the water level maintaining pipe is equipped with a filter element. The filter element can prevent shrimp larvae from accidentally leaking out.
[0012] Preferably, the system also includes a seed collection channel with a guide cavity. Multiple incubation boxes are provided and connected to the top of the seed collection channel. The drain outlet of each incubation box is located above and communicates with the guide cavity. Different sizes of berried shrimp are raised in different incubation boxes, allowing for targeted adjustment of their living conditions (such as water temperature, dissolved oxygen, and feed), which helps improve the hatching and survival rates of the shrimp larvae. Furthermore, the hatching time of berried shrimp in different incubation boxes can be more accurately predicted, facilitating centralized collection of shrimp larvae. After flowing out of the drain outlet, the shrimp larvae from different incubation boxes can gather in the guide cavity and flow out together, enabling the collection of shrimp larvae from multiple incubation boxes and improving farming efficiency.
[0013] Preferably, the system also includes a partition; the end of the shrimp larvae collection channel is provided with a collection port, and the partition is inserted into the guide cavity and closes the collection port or separates the collection port from the drain port at the end. The partition is used to block the water flow and shrimp larvae on the guide cavity. When collecting shrimp larvae, a fishing net is first placed at the collection port, and then the partition is pulled out, allowing the water and shrimp larvae on the guide cavity to be discharged through the collection port into the fishing net. The partition closes the collection port during non-collection periods to prevent shrimp larvae from escaping prematurely or being accidentally lost with the water flow, ensuring that shrimp larvae are fully collected in a specific area at a specific stage.
[0014] Preferably, a U-shaped slot is formed on the inner wall of the flow guiding cavity, and the partition is inserted into the U-shaped slot. The U-shaped slot can improve the stability of the partition and prevent the partition from being washed away by the water flow.
[0015] Preferably, the system also includes a light-shielding cover, which is located at the top of the incubation box and abuts against the incubation box. Crayfish prefer dark environments when spawning in nature; the light-shielding cover can restore their native habitat conditions, reduce the anxiety of berried crayfish, and prevent sudden changes in light from startling the berried crayfish and interrupting their incubation behavior.
[0016] Preferably, multiple light-shielding covers are provided; the incubators are divided into multiple groups, with a gap between adjacent groups of incubators; the number of light-shielding covers is the same as the number of groups of incubators, and each light-shielding cover is located on top of each group of incubators and abuts against each group of incubators. Dividing the incubators into multiple groups, with each group containing multiple incubators, and placing multiple incubators together to form a group, while maintaining a certain distance between each group of incubators, facilitates observation of the conditions inside the flow channel. Each group of incubators shares a single light-shielding cover, which helps reduce the number of light-shielding covers required.
[0017] Preferably, the seedling collection channel is inclined, with an inclination angle between 10° and 20°. This inclination angle refers to the angle between the axis of the collection channel and the horizontal ground. The inclined design allows water to flow naturally downwards along the channel to the collection port, improving the collection efficiency of shrimp seedlings and preventing shrimp seedlings or other objects from accumulating at the bottom of the guide cavity. Setting the inclination angle between 10° and 20° also avoids frictional damage caused by the accelerated sliding of shrimp seedlings.
[0018] Preferably, the tanks are all transparent. This allows farmers to easily observe the condition of the berried shrimp inside the tank in real time, enabling timely intervention in case of shrimp death or egg abandonment. It also facilitates the assessment of egg development, allowing for timely collection of shrimp larvae.
[0019] Preferably, the sealing cap is threadedly connected to the tank body. The threaded connection makes the installation and removal of the sealing cap simpler and faster.
[0020] The beneficial effects of this utility model are:
[0021] 1. Setting up adult shrimp tanks separates adult shrimp from shrimp larvae. After removing the adult shrimp tanks from the water tank, all shrimp larvae in the water tank can be removed at once, avoiding the loss of shrimp larvae and greatly improving the collection efficiency of shrimp larvae. Separating adult shrimp from shrimp larvae by using adult shrimp tanks can reduce contact between adult shrimp and shrimp larvae, which is conducive to improving the survival rate of shrimp larvae.
[0022] 2. The tank is made of transparent material, which allows for easy real-time observation of the berried shrimp inside the tank. This enables timely intervention when berried shrimp die or abandon their eggs, and also facilitates assessment of egg development for timely collection of shrimp larvae.
[0023] 3. A collection channel and multiple rearing boxes are set up, with berried shrimp of different sizes raised in separate boxes. This allows for targeted adjustment of the berried shrimp's living conditions (such as water temperature, dissolved oxygen, and feed), which is beneficial for improving the hatching and survival rates of shrimp larvae. Furthermore, the hatching time of berried shrimp in different rearing boxes can be more accurately predicted, facilitating centralized collection of larvae. After flowing out of the drain from different rearing boxes, the larvae can gather in the guide cavity and flow out together, enabling the collection of larvae from multiple rearing boxes and improving farming efficiency. Attached Figure Description
[0024] Figure 1 A top-view schematic diagram of a first embodiment of a crayfish hatching and collection device;
[0025] Figure 2 This is a partial structural diagram of the incubator;
[0026] Figure 3 A schematic diagram of the adult shrimp tank in a first embodiment of a crayfish hatching and collection device;
[0027] Figure 4 A schematic diagram of the adult shrimp tank in a second embodiment of a crayfish hatching and collection device;
[0028] Figure 5 A top view schematic diagram of a fourth embodiment of a crayfish hatching and collection device;
[0029] Figure 6 This is a schematic diagram showing the connection between the seedling collection channel and the incubation box.
[0030] In the attached diagram: 1-Incubation box; 101-Water tank; 102-Drainage outlet; 2-Limiting net; 3-Adult shrimp tank; 301-Tank body; 3011-Shrimp larvae passage; 302-Sealing cap; 303-Buoyancy structure; 4-Water level maintenance pipe; 5-Filter element; 7-Fry collection channel; 701-Guiding cavity; 702-Collection port; 703-U-shaped slot; 8-Baffle; 9-Support. Detailed Implementation
[0031] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.
[0032] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0033] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:
[0034] Example 1
[0035] This embodiment is a first embodiment of a crayfish hatching and collection device, combined with... Figures 1 to 3As shown, it includes a rearing box 1, a limiting net 2, and multiple adult shrimp tanks 3; the rearing box 1 is equipped with a water tank 101 and a drain outlet 102, and the limiting net 2 is detachably connected to the rearing box 1, specifically by a snap-fit connection; each adult shrimp tank 3 includes a cylindrical tank body 301 and a sealing cover 302, and the tank body 301 is equipped with a buoyancy structure 303; the top of the tank body 301 is provided with an adult shrimp passage (not shown in the figure) for berried shrimp to enter and exit, and the interior is provided with an spawning cavity (not shown in the figure) for placing berried shrimp, and multiple shrimp larvae passage holes 3011 are opened on the side wall for shrimp larvae to pass through only, and the spawning cavity is connected to the water tank 101 through the adult shrimp passage and the shrimp larvae passage holes 3011; the sealing cover 302 is detachably installed on the adult shrimp passage and closes the adult shrimp passage to prevent berried shrimp from swimming out; each adult shrimp tank 3 is located below the limiting net 2.
[0036] Specifically, the rearing box 1 is a PVC cuboid measuring 5 meters × 0.25 meters × 0.2 meters. Each rearing box 1 can hold 60-70 adult shrimp tanks 3. The density of the adult shrimp tanks 3 should not be too high. Each adult shrimp tank 3 holds one berried shrimp, and each berried shrimp can hatch 200-300 shrimp larvae.
[0037] Specifically, the buoyancy structure 303 is an annular float fitted outside the tank body 301, which is made of EPE foam material.
[0038] Specifically, tank 301 is entirely transparent. This allows aquaculture personnel to easily observe the status of berried shrimp inside tank 301 in real time, enabling timely intervention in case of shrimp death or egg abandonment. It also facilitates the assessment of egg development, allowing for timely collection of shrimp larvae.
[0039] Specifically, the sealing cap 302 is threadedly connected to the tank body 301. The threaded connection makes the installation and removal of the sealing cap 302 simpler and faster.
[0040] Furthermore, a light-shielding cover (not shown in the figure) is also included, which is located on top of the incubation box 1 and abuts against it. The light-shielding cover does not have special structural requirements; it only needs to cover the top of the incubation box to block light. Therefore, this embodiment does not describe the specific structure of the light-shielding cover in detail. Crayfish prefer dark environments when spawning in nature. The light-shielding cover can restore their native habitat conditions, reduce the anxiety of berried crayfish, and prevent sudden changes in light from startling the berried crayfish and interrupting their incubation behavior.
[0041] The working principle or workflow of this embodiment is as follows: During implementation, unscrew the sealing cap 302, place the berried shrimp nearing spawning through the adult shrimp inlet into the spawning chamber of the tank 301, and then screw the sealing cap 302 back onto the adult shrimp inlet. Next, place the tank 301 into the water tank 101, and finally reinstall the limiting net 2 into the water tank 101. Then, fill the water tank with water until it submerges the limiting net 2. It is important to note that after filling the water tank, water conditioning is necessary. Lime should be sprinkled, and some beneficial algae and bacteria, such as Chlorella, photosynthetic bacteria, Bacillus, and lactic acid bacteria, should be added appropriately to purify the water and stabilize its quality. The shrimp mentioned above must be berried shrimp and close to their spawning period; otherwise, storing them in the adult shrimp tank for too long may cause them to die.
[0042] Under the buoyancy of the buoyancy structure 303, the tank 301 remains floating and abuts against the limiting net 2, ensuring that the water submerges the tank 301. After the berried shrimp lays its eggs, the larvae will temporarily remain in the abdomen of the mother shrimp and be expelled from the mother after about 7 days. Because the larvae have an innate instinct to avoid harm, they will swim out of the tank 301 through the larva passage 3011 after expelling the mother shrimp, while the adult shrimp, due to their larger size, are confined inside the tank 301 and cannot prey on the larvae. When it is necessary to collect the larvae, the limiting net 2 is removed, allowing the adult shrimp tank 3 to float to the surface of the water. Then, the adult shrimp tank 3 is retrieved, and the adult shrimp inside the tank 301 are taken out. Finally, the drain outlet 102 is opened, allowing the larvae and the water in the tank 101 to be discharged through the drain outlet 102, thus achieving the collection of the larvae. Compared to the existing method of collecting shrimp larvae using shrimp houses, the above-mentioned technical solution can export all shrimp larvae at once, avoiding the loss of shrimp larvae and greatly improving the collection efficiency of shrimp larvae. Moreover, the separation of adult shrimp and shrimp larvae by the tank 301 can reduce the contact between adult shrimp and shrimp larvae, which is conducive to improving the survival rate of shrimp larvae.
[0043] Example 2
[0044] This embodiment is a second embodiment of a crayfish hatching and collection device. This embodiment is similar to Embodiment 1, except that, as shown in the following... Figure 4 As shown, the buoyancy structure 303 is a sealed air chamber located at the bottom of the tank body 301.
[0045] Other features, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 1.
[0046] Example 3
[0047] This embodiment is a third embodiment of a crayfish hatching and collection device. This embodiment is similar to Embodiment 1, except that it combines... Figure 1 and Figure 2As shown, the drain outlet 102 is located at the bottom of the tank 101. A water level maintaining pipe 4 is detachably connected to the drain outlet 102. The water level maintaining pipe 4 is located inside the tank 101 and passes through the limiting net 2, with the top opening of the water level maintaining pipe 4 located above the limiting net 2. It is understood that the water level maintaining pipe 4 prevents all the water in the tank 101 from flowing out, maintaining the water level at the position of the top opening of the water level maintaining pipe 4. When it is necessary to release the shrimp larvae, the water level maintaining pipe 4 is removed, allowing the shrimp larvae and the water in the tank 101 to drain out through the drain outlet 102.
[0048] Furthermore, a filter element 5 is provided at the top of the water level maintenance pipe 4. The filter element 5 has a diameter of 10cm and includes a layer of iron mesh and gauze above the iron mesh. The filter element 5 can prevent shrimp larvae from accidentally leaking out.
[0049] Other features, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 1.
[0050] Example 4
[0051] This embodiment is a fourth embodiment of a crayfish hatching and collection device. This embodiment is similar to embodiment 3, except that it combines... Figures 1 to 3 , Figures 5 to 6 As shown, the system also includes a seed collection channel 7 with a flow guide cavity 701. Multiple rearing boxes 1 are provided and connected to the top of the seed collection channel 7. The drain outlet 102 of each rearing box 1 is located above and connected to the flow guide cavity 701. Different sizes of berried shrimp are raised in different rearing boxes 1, allowing for targeted adjustment of the berried shrimp's living conditions (such as water temperature, dissolved oxygen, and feed), which is beneficial for improving the hatching rate and survival rate of shrimp larvae. Furthermore, the hatching time of berried shrimp in different rearing boxes 1 can be more accurately predicted, facilitating centralized collection of shrimp larvae. After flowing out of the drain outlet 102, the shrimp larvae in different rearing boxes 1 can gather in the flow guide cavity 701 and flow out together, thus enabling the collection of shrimp larvae from multiple rearing boxes 1 and improving farming efficiency.
[0052] Specifically, the seedling collection channel 7 is made of PVC material, and its length is determined according to the arrangement length of the cultivation boxes 1. Its height and width are both between 20cm and 25cm.
[0053] Furthermore, it also includes a support frame 9, which and the seedling collection channel 7 are located on both sides of the incubator 1 and connected to the incubator 1, so that the incubator 1 can be supported more stably.
[0054] Furthermore, it also includes a partition 8; the end of the shrimp larvae collection channel 7 is provided with a collection port 702, and the partition 8 is inserted into the guide cavity 701 and closes the collection port 702 or separates the collection port 702 from the drain port 102 at the end. The partition 8 is used to block the water flow and shrimp larvae on the guide cavity 701. When collecting shrimp larvae, a fishing net is first set up at the collection port 702, and then the partition 8 is pulled out, so that the water and shrimp larvae on the guide cavity 701 can be discharged into the fishing net through the collection port 702. The partition 8 closes the collection port 702 during the non-collection stage to prevent the shrimp larvae from escaping in advance or being accidentally lost with the water flow, ensuring that the shrimp larvae are fully collected in a specific area at a specific stage.
[0055] Furthermore, both the baffle 8 and the flow guiding cavity 701 are inverted trapezoidal, which can improve the sealing performance of the baffle 8.
[0056] Furthermore, a U-shaped slot 703 is provided on the inner wall of the flow guiding cavity 701, and the partition 8 is inserted into the U-shaped slot 703. The edge portion of the partition 8 located inside the flow guiding cavity 701 is embedded in the U-shaped slot 703. The U-shaped slot 703 can improve the stability of the partition 8 and prevent the partition 8 from being washed away by the water flow.
[0057] Furthermore, multiple light-shielding covers (not shown in the figure) are provided; the incubators 1 are divided into multiple groups, with a gap between adjacent groups of incubators 1; the number of light-shielding covers is the same as the number of groups of incubators 1, and each light-shielding cover is located on top of each group of incubators 1 and abuts against each group of incubators 1. The incubators 1 are divided into multiple groups, each group having four incubators 1, and of course, five, six, etc., can also be arranged according to actual needs. Multiple incubators 1 are grouped together to form a group, and each group of incubators 1 maintains a certain distance, which facilitates observation of the situation inside the guide cavity 701. Each group of incubators 1 shares a light-shielding cover, which helps to reduce the number of light-shielding covers required.
[0058] Other features, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 3.
[0059] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.
[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description, and it is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A device for hatching and collecting crayfish, characterized in that, The system includes a rearing box (1), a limiting net (2), and multiple adult shrimp tanks (3); the rearing box (1) is provided with a water tank (101) and a drain outlet (102), and the limiting net (2) is detachably connected to the rearing box (1); each adult shrimp tank (3) includes a tank body (301) and a sealing cover (302), the tank body (301) is provided with a buoyancy structure (303), the tank body (301) is also provided with an spawning chamber, an adult shrimp inlet and multiple shrimp larvae inlets (3011), the spawning chamber is connected to the water tank (101) through the adult shrimp inlet and the shrimp larvae inlets (3011), and the sealing cover (302) is detachably installed on the adult shrimp inlet; each adult shrimp tank (3) is located below the limiting net (2).
2. The device for hatching and collecting of crayfish according to claim 1, characterized in that, The drain outlet (102) is located at the bottom of the water tank (101). A water level maintenance pipe (4) is detachably connected to the drain outlet (102). The water level maintenance pipe (4) is located inside the water tank (101) and passes through the limiting net (2). The top opening of the water level maintenance pipe (4) is located above the limiting net (2).
3. The device for hatching and collecting of crayfish according to claim 2, characterized in that, The top opening of the water level maintaining pipe (4) is provided with a filter element (5).
4. The device for hatching and collecting of shrimp larvae according to claim 2, wherein It also includes a seedling collection channel (7) with a flow guide cavity (701). The cultivation box (1) is provided in multiple ways and is connected to the top of the seedling collection channel (7). The drain outlet (102) of each cultivation box (1) is located above the flow guide cavity (701) and is connected to the flow guide cavity (701).
5. The device for hatching and collecting of crayfish according to claim 4, characterized in that, It also includes a partition (8); the end of the seedling collection channel (7) is provided with a collection port (702), the partition (8) is inserted into the guide cavity (701) and closes the collection port (702) or separates the collection port (702) from the drain port (102) at the end.
6. The device for hatching and collecting of crayfish according to claim 5, characterized in that, A U-shaped slot (703) is provided on the inner wall of the flow guide cavity (701), and the partition (8) is inserted into the U-shaped slot (703).
7. The device for hatching and collecting of crayfish larvae according to claim 4, characterized in that, It also includes a light-shielding cover, which is located on top of the incubator (1) and abuts against the incubator (1).
8. The device for hatching and collecting of crayfish larvae according to claim 7, characterized in that, The light-shielding cover is provided in multiple ways; the incubation box (1) is divided into multiple groups, and there is a gap between two adjacent groups of incubation boxes (1); the number of light-shielding covers is the same as the number of groups of incubation boxes (1), and the light-shielding cover is located on the top of each group of incubation boxes (1) and abuts against each group of incubation boxes (1).
9. The device for hatching and collecting of crayfish larvae according to claim 4, characterized in that, The seedling collection channel (7) is inclined, and the inclination angle of the seedling collection channel (7) is between 10° and 20°.
10. The device for hatching and collecting of crayfish larvae according to any one of claims 1 to 9, characterized in that, The tanks (301) are all transparent.