Ecological intensive crab culture device, culture system and crab culture area

Abstract

The utility model relates to a crab breeding device and a crab breeding system, which comprise a breeding basket body and a sandy layer, and are characterized in that the crab breeding device further comprises a blowdown device, the blowdown device comprises a first blowdown chamber which is relatively isolated from the breeding basket body and is suitable for high-water-level breeding, and a vertically arranged partition plate is arranged in the first blowdown chamber; compared with the prior art, the first pollution discharge chamber suitable for high-water-level cultivation has the advantages that the partition plate located between the high water inlet and the low water inlet is used for forming the first flow channel and the second flow channel which are communicated with fluid of the cultivation basket body, and therefore the first pollution discharge chamber suitable for high-water-level cultivation is convenient to use. The water level pressure difference between the inner side and the outer side is generated between the partition plate and the breeding basket body by means of the height of the partition plate, so that water, excrement and residual feed in the sandy layer in the breeding basket body automatically enter the first pollution discharge chamber through the first flow channel from the low water inlet and then are discharged through the first water outlet of the second flow channel, and self-cleaning of the sandy layer is achieved.

Description

Technical Field

[0001] The utility model relates to the field of aquaculture, and in particular to an ecological intensive crab breeding device, a breeding system and a crab breeding area. Background Art

[0002] With the continuous development of crab farming technology, "crab apartments" for separating crabs for farming have been produced. The structure of the crab apartment can refer to a Chinese utility model patent No. 201921431446.4 (authorization announcement No. CN210929164U) entitled "A crab farming device", which includes a farming box body and a partition, which divides the farming box body into a first area with a sandy layer and a second area with a sewage unit. Although the sewage unit can discharge excrement and residual bait to achieve a self-cleaning function, the following defects still exist in the actual farming process: First, crabs need to be farmed at high and low water levels at different growth stages, and the high water level is suitable for large crab farming, so it is necessary to A sandy layer is laid on the breeding box body, which can provide sand for crabs to burrow into and prevent them from developing ulcers while simulating the living conditions of crabs in nature. The low water level is suitable for breeding small crabs. Therefore, how to prevent the sandy layer from stinking due to the accumulation of residual bait or excrement, thereby causing stress response and slow growth of crabs, and how to switch between high and low water levels are all problems that need to be solved urgently; second, the sewage discharge unit adopts a siphon generating device, and its overall device structure is relatively complex and the production cost is high; third, the setting of the double areas in the breeding box body reduces the breeding space for crabs in the breeding box body; fourth, the breeding box body lacks a water rest space for crabs that like to dry out. Utility Model Content

[0003] The first technical problem to be solved by the utility model is to provide a crab breeding device which can prevent the sand layer from stinking due to the accumulation of residual bait or excrement in view of the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the utility model is to provide a crab breeding device which can switch between high and low level breeding in view of the above-mentioned existing technical status.

[0005] The third technical problem to be solved by the present invention is to provide a low-cost crab farming system using the above-mentioned crab farming device in view of the above-mentioned existing technical status.

[0006] The fourth technical problem to be solved by the present invention is to provide a crab breeding area which is applied with the breeding system and is easy to move in view of the above-mentioned existing technical status.

[0007] The utility model solves the above-mentioned first technical problem by adopting the following technical solution: the crab breeding device comprises:

[0008] Breeding basket body;

[0009] A sandy layer is laid on the bottom of the breeding basket body;

[0010] Features:

[0011] It also includes a sewage discharge device, which includes a first sewage discharge chamber relatively isolated from the breeding basket body and suitable for high water level breeding, and a vertically arranged partition is provided in the first sewage discharge chamber to divide the first sewage discharge chamber into a first flow channel and a second flow channel that are connected;

[0012] A low water inlet lower than the top of the partition and a high water inlet higher than the top of the partition are provided on the first wall of the first sewage chamber corresponding to the first flow channel, and a first water outlet is provided on the bottom wall of the first sewage chamber corresponding to the second flow channel, thereby achieving: with the help of the height of the partition, water level pressure is generated inside and outside the first sewage chamber, so that the water in the sandy layer together with the excrement and leftover bait can enter the first sewage chamber through the low water inlet through the first flow channel, and then be discharged through the first water outlet of the second flow channel.

[0013] The first sewage discharge chamber can be cylindrical or square, as long as it can be relatively isolated from the breeding basket body. The bottom wall of the first sewage discharge chamber can be independently set from the bottom wall of the breeding basket body, or it can be: a part of the bottom wall of the breeding basket body directly serves as the bottom wall of the first sewage discharge chamber, and the first sewage discharge chamber also includes a side peripheral wall extending upward from the bottom wall, and the first wall portion constitutes part of the side peripheral wall. This can also reduce the production cost of the entire breeding basket body.

[0014] The first sewage chamber is described using a square frame as an example:

[0015] The first sewage discharge chamber uses the side wall of the breeding basket body as the inner side wall of the first sewage discharge chamber, and the side peripheral wall has three parts: the first wall part arranged opposite to the inner side wall, and the first side wall and the second side wall connecting the first wall part and the inner side wall, the partition is connected to the first side wall and the second side wall, and the bottom end of the partition is connected to the bottom wall of the first sewage discharge chamber. The advantage of this design is that the partition can be arranged more stably, and on the other hand, the first sewage discharge chamber is arranged at the most side position relative to the breeding basket body, so as to maximize the "giving up" of the activity area required for crab breeding.

[0016] In order to balance the pressure of the first sewage discharge chamber and the outside atmosphere, preferably, the top of the first sewage discharge chamber is open, and the back of the bottom wall of the breeding basket body is provided with a first water outlet pipe connected to the first water outlet of the second flow channel. The first water outlet pipe can be connected to the top open part of each breeding basket body located below, so that the water in the sandy layer of the breeding basket body of the upper layer, together with the excrement and the leftover bait, directly flows into the breeding basket body of the next layer through the first water outlet pipe, so as to realize the step-by-step self-purification of the sandy layer.

[0017] In order to achieve low-water-level aquaculture, preferably, the sewage discharge device further includes a second sewage discharge chamber which is located on a different side wall of the aquaculture basket body from the first sewage discharge chamber and is relatively isolated from the aquaculture basket body, and the second sewage discharge chamber is suitable for low-water-level aquaculture, wherein:

[0018] The second drainage chamber is provided with a second water inlet located between the low water inlet and the high water inlet, the bottom wall of the second drainage chamber is provided with a second water outlet, and a second water outlet pipe connected to the second water outlet is provided on the back of the bottom wall of the breeding basket body, the water outlet end of the second water outlet pipe is connected to the middle of the first water outlet pipe, and a switch component for connecting or disconnecting the waterway of the first water outlet pipe is provided on the second water outlet pipe. When crabs need to be cultured at a low water level (no sand layer is required), the switch component is opened, and the second water outlet pipe of the first drainage chamber here serves as the water outlet end of the second water outlet pipe, and the water in the breeding basket body can flow out through the second water outlet pipe.

[0019] In order to provide a resting space for crabs that like to dry out, preferably, a drying platform for crabs to dry out and rest is detachably provided in the breeding basket body, and the drying platform is arranged adjacent to the first sewage discharge chamber, and its height is between the low water inlet and the high water inlet. The drying platform is located between the low water inlet and the high water inlet, and it can not affect the sewage discharge function of the first sewage discharge chamber.

[0020] In order to keep the dry platform dry, preferably, the dry platform includes a platform body and at least two drainage holes arranged on the platform body for drainage, the platform body is provided with a notch that can adapt to the first sewage discharge chamber, and the breeding basket body is also provided with a support for supporting the platform body, and the support is provided with a slot for the platform body to be inserted. The dry platform is prevented from moving by the clamping connection between the dry platform and the support column.

[0021] Furthermore, the bottom of the breeding basket body is provided with a third water outlet for discharging the sandy layer together with the breeding water or for switching the first sewage discharge chamber and the second sewage discharge chamber, and a switch for opening or closing the third water outlet is installed in the third water outlet. The third water outlet can realize the switching between high-water-level breeding and low-water-level breeding. This switching does not mean the random switching during the breeding process. Only after the breeding in one mode is completed can the other mode be switched to breeding; when the third water outlet is closed, for example, during the summer growth period, small crabs can be bred at a low water level, and after the commercial crabs are sold, the same system can still be used, but it is directly switched to high-water-level breeding, and a sandy layer is added to the breeding basket body, so that it can be used to breed large crabs; when the third water outlet is opened, it can be used as the discharge of clean water together with the sandy layer when the whole breeding basket body is finally cleaned.

[0022] The technical solution adopted by the utility model to solve the third technical problem mentioned above is: the crab breeding system includes at least two breeding basket bodies arranged vertically and / or horizontally, a main water outlet pipe located at the bottom layer and connecting the first water outlet pipes of each breeding basket body at the bottom, a pump body connected to the water outlet end of the main water outlet pipe, and a water supply pipe located at the top layer and connected to the pump body for supplying water to each breeding basket body at the top. The characteristic is that the breeding basket body adopts the breeding basket body as mentioned above, and from top to bottom, the first water outlet pipe and / or the second water outlet pipe of each breeding basket body located at the top are directly connected to the top open part of each breeding basket body located at the bottom. By using the first sewage discharge device in the breeding basket, water can flow from the first sewage discharge device in the upper breeding box into the lower breeding box, and gravity flows through the self-flow between each breeding basket body, which greatly reduces the electric energy required for circulating water and the pipelines required for water inlet and outlet.

[0023] The breeding basket bodies are arranged into vertical and / or horizontal breeding basket groups, and a water channel connection is formed through the main water outlet pipe, the pump body and the water supply pipe, so that the breeding water can be circulated repeatedly back to the breeding basket bodies, thereby quickly and centrally cleaning the remaining bait and excrement to purify the breeding water.

[0024] The technical solution adopted by the utility model to solve the fourth technical problem mentioned above is: the crab breeding area includes a pond, and is characterized in that: the breeding system as mentioned above is arranged in a container, and the container is provided with a through-hole for the connecting pipe to pass through, the first end of the connecting pipe is connected to the pond, and the second end of the connecting pipe passes through the through-hole and is connected to the main water outlet pipe and the water pump fluid.

[0025] The breeding system is set up in a container, and an intensive breeding system that is easy to move is constructed. It is then connected to the pond through connecting pipes. The ecosystem in the pond is used to purify the breeding tail water produced by high-density crab breeding and recycle it, reducing equipment investment and electricity consumption.

[0026] Compared with the prior art, the utility model has the advantages that: the first sewage discharge chamber suitable for high-water-level aquaculture utilizes a partition located between the high water inlet and the low water inlet to form a first flow channel and a second flow channel that are in fluid communication with the aquaculture basket body. In this way, when the water level in the aquaculture basket body is higher than the height of the partition, the first flow channel of the first sewage discharge chamber generates a water level pressure difference between the inside and outside of the aquaculture basket body by virtue of the height of the partition. Since the sandy layer itself is relatively heavy, it will not be washed away by the water flow. In this way, the water in the sandy layer in the aquaculture basket body together with the excrement and residual bait will automatically enter the first sewage discharge chamber through the low water inlet through the first flow channel, and then be discharged through the first water outlet of the second flow channel, thereby achieving the goal of flushing away the excrement while retaining the sandy layer, and finally achieving self-purification of the sandy layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;

[0028] Figure 2 This is a schematic diagram of Example 1 of the utility model (excluding the door panel and the partition panel);

[0029] Figure 3 Another schematic diagram of Embodiment 1 of the present utility model;

[0030] Figure 4 This is a cross-sectional view of the breeding basket body of Example 1 of the utility model;

[0031] Figure 5 This is a schematic diagram of a crab breeding system according to Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of a crab breeding area in Example 1 of the utility model. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1-4The crab culture device of this embodiment is applicable to high water level culture and low water level culture. During the summer growth period, small crabs can be cultured at low water level. After the commercial crabs are sold, the same system can still be used, but high water level culture is directly switched, and a sandy layer A is added to the culture basket body 1, so that large crabs can be cultured. Since the excrement and residual bait of the crabs will settle in the sandy layer A during the culture process, if the excrement or residual bait is not washed away in time, it is easy to cause the sandy layer A to stink.

[0036] In the actual breeding process, a crab breeding system is formed, that is, it includes at least two breeding basket bodies 1 arranged vertically and / or horizontally, a main water outlet pipe 51 located at the bottom layer and connecting the first water outlet pipes of each breeding basket body 1 at the bottom, a pump body 5 connected to the water outlet end of the main water outlet pipe 51, and a water supply pipe located at the top layer and connected to the pump body 5 for supplying water to each breeding basket body 1 at the top. From top to bottom, the first water outlet pipe 11 and the second water outlet pipe 12 of each breeding basket body 1 located at the top are directly connected to the top open part of each breeding basket body 1 located at the bottom. The breeding basket bodies 1 are arranged into vertical and / or horizontal breeding basket groups, and a water connection is formed through the main water outlet pipe 51, the pump body 5 and the water supply pipe, so that the breeding water can be circulated and repeatedly returned to the breeding basket bodies 1. By utilizing the sewage discharge device 2 in the breeding basket, water can flow from the sewage discharge device 2 in the upper breeding box to the lower breeding box. The gravity flows through the self-flow between the breeding basket bodies 1. While being able to quickly and centrally clean up the remaining bait and excrement to purify the breeding water, it can also greatly reduce the electric energy required for circulating water and the pipelines required for water inlet and outlet.

[0037] The sewage discharge device 2 in the aquaculture system is divided into high-water level aquaculture and low-water level aquaculture according to the different growth cycles of crabs. The high-water level aquaculture is first introduced. The bottom of the aquaculture basket body 1 of this embodiment is paved with a sand layer A, and also includes a sewage discharge device 2. The sewage discharge device 2 includes a first sewage discharge chamber 21 which is relatively isolated from the aquaculture basket body 1 and is suitable for high-water level aquaculture. A vertical partition 211 is provided in the first sewage discharge chamber 21 to separate the first sewage discharge chamber 21 into a first flow channel 212 and a second flow channel 213 which are connected to each other. The first sewage discharge chamber 21 corresponds to the first flow channel 213. A low water inlet 215 which is lower than the top of the partition 211 and a high water inlet 216 which is higher than the top of the partition 211 are provided on the first wall portion 214 of the channel 212. A first water outlet 111 is provided on the bottom wall of the first sewage chamber 21 corresponding to the second flow channel 213, thereby achieving: with the help of the height of the partition 211, water level pressure is generated inside and outside the first sewage chamber 21, so that the water in the sandy layer A together with the excrement and leftover bait can enter the first sewage chamber 21 through the first flow channel 212 from the low water inlet 215, and then be discharged through the first water outlet 111 of the second flow channel 213. The first flow channel 212 of the first sewage chamber 21 creates a water level pressure difference between the inside and outside of the breeding basket body 1 by virtue of the height of the partition 211. Since the sandy layer A itself is relatively heavy, it will not be washed away by the water flow. In this way, the water in the sandy layer A in the breeding basket body 1 together with the excrement and leftover bait will automatically enter the first sewage chamber 21 through the low water inlet 215 through the first flow channel 212, and then be discharged through the first water outlet 111 of the second flow channel 213, thereby achieving the goal of flushing away the excrement while retaining the sandy layer A, and finally achieving self-purification of the sandy layer A.

[0038] Specifically, the first sewage discharge chamber 21 can be cylindrical or frame-shaped, as long as it can be relatively isolated from the breeding basket body 1. The bottom wall of the first sewage discharge chamber 21 can be independently set from the bottom wall of the breeding basket body 1, or it can be: a part of the bottom wall of the breeding basket body 1 directly serves as the bottom wall of the first sewage discharge chamber 21, and the first sewage discharge chamber 21 also includes a side peripheral wall extending upward from the bottom wall, and the first wall portion 214 constitutes part of the side peripheral wall. This can also reduce the production cost of the entire breeding basket body 1.

[0039] The first sewage chamber 21 is described by taking a square frame as an example:

[0040] The first sewage discharge chamber 21 directly uses the side wall portion of the breeding basket body 1 as the inner side wall of the first sewage discharge chamber 21, and there are three side walls: a first wall portion 214 arranged opposite to the inner side wall, and a first side wall 217 and a second side wall 218 connecting the first wall portion 214 and the inner side wall, a partition 211 connected to the first side wall 217 and the second side wall 218, and the bottom end of the partition 211 connected to the bottom wall of the first sewage discharge chamber 21. The advantage of this design is that the partition 211 can be set more stably, and on the other hand, the first sewage discharge chamber 21 is set at the most side position relative to the breeding basket body 1, which maximizes the "giving up" of the activity area required for crab breeding. In addition, in order to balance the pressure of the first sewage discharge chamber 21 and the outside atmosphere, the top of the first sewage discharge chamber 21 is designed to be open, and the back of the bottom wall of the breeding basket body 1 is provided with a first outlet pipe 11 connected to the first outlet 111 of the second flow channel 213. The first water outlet pipe 11 can be connected to the open top portion of each breeding basket body 1 located below, so that the water in the sandy layer A of the breeding basket body 1 on the upper layer, together with the excrement and leftover bait, can flow directly into the breeding basket body 1 on the lower layer through the first water outlet pipe 11, thereby realizing the step-by-step self-purification of the sandy layer A. The breeding basket body 1 on the uppermost layer needs to be provided with a water inlet pipe that can continuously provide water.

[0041] Since large crabs need to be provided with a resting space out of water for crabs that like to dry out during their growth, a removable drying platform 3 for crabs to dry out and rest is provided in the breeding basket body 1. The drying platform 3 is arranged adjacent to the first sewage discharge chamber 21, and its height is between the low water inlet 215 and the high water inlet 216. The drying platform 3 is located between the low water inlet 215 and the high water inlet 216, and it can not affect the sewage discharge function of the first sewage discharge chamber 21. The drying platform 3 includes a platform body and at least two drainage holes arranged on the platform body for draining water to keep the drying platform dry. A notch that can adapt to the first sewage discharge chamber 21 is opened on the platform body, and a support member 14 for supporting the platform body is also provided on the breeding basket body 1. The support member 14 is provided with a slot 141 for the platform body to be inserted. The movement of the drying platform 3 is prevented by the clamping connection between the drying platform 3 and the support column.

[0042] Of course, in order to enable the breeding basket body 1 to utilize low water level to breed small crabs, a second drainage chamber 22 is provided in the breeding basket body 1, which is located on different side walls of the breeding basket body 1 and is relatively isolated from the breeding basket body 1. It can also be provided on the same side wall, which can be determined according to actual production needs, wherein the second drainage chamber 22 is provided with a second water inlet 221 located at a height between the low water inlet 215 and the high water inlet 216, and the bottom wall of the second drainage chamber 22 is provided with a second water outlet 121, and at the bottom wall of the breeding basket body 1 A second water outlet pipe 12 connected to a second water outlet 121 is provided on the back of the bottom wall. The water outlet end of the second water outlet pipe 12 is connected to the middle of the first water outlet pipe 11, and a switch 13 for connecting or disconnecting the water channel of the first water outlet pipe 11 is provided on the second water outlet pipe 12. When crabs need to be cultured at a low water level (no sandy layer A is required), the switch 13 is opened. Here, the second water outlet pipe 12 of the first sewage discharge chamber 21 serves as the water outlet end of the second water outlet pipe 12, and the water in the culture basket body 1 can flow out through the second water outlet pipe 12.

[0043] Finally, a third water outlet 23 is provided at the center of the bottom of the breeding basket body 1 for discharging the sandy layer A together with the breeding water or for switching the use of the first sewage discharge chamber 21 and the second sewage discharge chamber 22. A switch 4 for opening or closing the third water outlet 23 is installed in the third water outlet 23. The third water outlet 23 can realize the switching between high-water level breeding and low-water level breeding. This switching does not mean the random switching during the breeding process. Only after the breeding in one mode is completed can the other mode be switched to breeding; when the third water outlet 23 is closed, for example, during the summer growth period, small crabs can be bred at a low water level. After the commercial crabs are sold, the same system can still be used, but it is directly switched to high-water level breeding, and the sandy layer A is added to the breeding basket body 1, so that it can be used to breed large crabs; when the third water outlet 23 is opened, it can be used as the discharge of clean water together with the sandy layer A when the whole breeding basket body is finally cleaned.

[0044] In summary, the working process of this breeding device is as follows:

[0045] (1) Low water level aquaculture (no sandy layer A):

[0046] The switch member 13 is turned on, so that the second water outlet pipe 12 is connected to the first water outlet pipe 11, and the water in the breeding basket body 1 can flow out from the first sewage chamber 21 and the second sewage chamber 22 of the sewage discharge device 2. Since the height of the second water inlet 221 of the second sewage chamber 22 is located between the low water inlet 215 and the high water inlet 216, and is lower than the top of the partition 211, when the water level reaches the height of the second water inlet 221, the water will enter the second sewage chamber 22 from the second water inlet 221, and then be discharged from the second water outlet 121 of the second sewage chamber 22;

[0047] (2) High water level aquaculture (with sandy layer A):

[0048] The switch 13 is closed, thereby disconnecting the second water outlet pipe 12 from the first water outlet pipe 11; water is continuously supplied to the breeding basket body 1 through the water inlet pipe, so that the water level is kept stable between the low water inlet 215 and the high water inlet 216, and a water level difference is created between the first flow channel 212 and the second flow channel 213 by virtue of the height of the partition 211. Therefore, there is a pressure difference, and under the action of the pressure, the water in the sandy layer A, together with the excrement and the leftover bait, enters the first sewage chamber 21 from the low water inlet 215 through the first flow channel 212, and then is discharged through the first water outlet 111 of the second flow channel 213;

[0049] (3) Breeding system:

[0050] The structure of the breeding system Figure 5 As shown, from top to bottom, the first water outlet pipe 11 and the second water outlet pipe 12 of each breeding basket body 1 located at the top are directly connected to the top open part of each breeding basket body 1 located at the bottom, and then each breeding basket body 1 is connected to form a breeding system through a water channel formed between the main water outlet pipe 51, the pump body 5 and the water supply pipe, so that the breeding water is repeatedly circulated and returned to each breeding basket body 1, so that the residual bait and excrement can be quickly and centrally cleaned to purify the breeding water;

[0051] (4) Crab breeding area:

[0052] The structure of crab culture area is as follows Figure 6 As shown, the aquaculture system is arranged in a container 6, and a through-out portion 62 is provided on the container 6 for a connecting pipe 61 to pass through. The first end of the connecting pipe 61 is connected to the pond 7, and the second end of the connecting pipe 61 passes through the through-out portion 62 and is fluidically connected to the main outlet pipe 51 and the water pump 5. The aquaculture tail water generated by high-density crab aquaculture is purified by using the ecosystem of the pond and recycled, thereby reducing equipment investment and power consumption.

Claims

1. A crab breeding device, comprising: Breeding basket body (1); A sandy layer (A) is laid on the bottom of the breeding basket body (1); Features: The device also comprises a sewage discharge device (2), wherein the sewage discharge device (2) comprises a first sewage discharge chamber (21) which is relatively isolated from the breeding basket body (1) and is suitable for high water level breeding, and a vertical partition (211) is provided in the first sewage discharge chamber (21) to separate the first sewage discharge chamber (21) into a first flow channel (212) and a second flow channel (213) which are connected to each other; A low water inlet (215) lower than the top of the partition (211) and a high water inlet (216) higher than the top of the partition (211) are provided on the first wall portion (214) of the first sewage chamber (21) corresponding to the first flow channel (212), and a first water outlet (111) is provided on the bottom wall of the first sewage chamber (21) corresponding to the second flow channel (213), thereby achieving: water level pressure is generated inside and outside the first sewage chamber (21) by virtue of the height of the partition (211), so that water in the sandy layer (A) together with excrement and leftover bait can enter the first sewage chamber (21) from the low water inlet (215) through the first flow channel (212), and then be discharged through the first water outlet (111) of the second flow channel (213).

2. The crab breeding device according to claim 1, characterized in that: A portion of the bottom wall of the breeding basket body (1) directly serves as the bottom wall of the first sewage discharge chamber (21); the first sewage discharge chamber (21) further comprises a side peripheral wall extending upward from the bottom wall; the first wall portion (214) constitutes part of the side peripheral wall.

3. The crab breeding device according to claim 2, characterized in that: The first sewage discharge chamber (21) directly uses the side wall portion of the breeding basket body (1) as the inner side wall of the first sewage discharge chamber (21), and the side surrounding walls include three: a first wall portion (214) arranged opposite to the inner side wall, and a first side wall (217) and a second side wall (218) connecting the first wall portion (214) and the inner side wall, the partition (211) is connected to the first side wall (217) and the second side wall (218), and the bottom end of the partition (211) is connected to the bottom wall of the first sewage discharge chamber (21).

4. The crab breeding device according to any one of claims 1 to 3, characterized in that: The top of the first sewage discharge chamber (21) is open, and a first water outlet pipe (11) connected to the first water outlet (111) of the second flow channel (213) is provided on the back of the bottom wall of the breeding basket body (1).

5. The crab breeding device according to claim 4, characterized in that: The sewage discharge device (2) further comprises a second sewage discharge chamber (22) which is located on a different side wall of the breeding basket body (1) from the first sewage discharge chamber (21) and is relatively isolated from the breeding basket body (1), wherein the second sewage discharge chamber (22) is suitable for low-water level breeding, wherein: The second sewage chamber (22) is provided with a second water inlet (221) whose height is between the low water inlet (215) and the high water inlet (216); the bottom wall of the second sewage chamber (22) is provided with a second water outlet (121); a second water outlet pipe (12) connected to the second water outlet (121) is provided on the back side of the bottom wall of the breeding basket body (1); the water outlet end of the second water outlet pipe (12) is connected to the middle part of the first water outlet pipe (11); and a switch member (13) for connecting or disconnecting the water channel of the first water outlet pipe (11) is provided on the second water outlet pipe (12).

6. The crab breeding device according to claim 5, characterized in that: A dehumidification platform (3) for crabs to rest and dehumidify is detachably disposed in the culture basket body (1); the dehumidification platform (3) is disposed adjacent to the first sewage discharge chamber (21) and has a height between the low water inlet (215) and the high water inlet (216).

7. The crab breeding device according to claim 6, characterized in that: The drying platform (3) comprises a platform body and at least two drainage holes arranged on the platform body for drainage, the platform body is provided with a notch that can adapt to the first sewage discharge chamber (21), and the breeding basket body (1) is also provided with a support member (14) for supporting the platform body, and the support member (14) is provided with a slot (141) for the platform body to be inserted.

8. The crab breeding device according to any one of claims 5 to 7, characterized in that: The bottom of the breeding basket body (1) is provided with a third water outlet (23) for discharging the sand layer (A) together with the breeding water or for switching between the first sewage discharge chamber (21) and the second sewage discharge chamber (22); the third water outlet (23) is provided with a switch (4) for opening or closing the third water outlet (23).

9. A crab breeding system, comprising at least two breeding basket bodies (1) arranged vertically and / or horizontally, a main water outlet pipe (51) located at the bottom layer and connecting the first water outlet pipes (11) of each breeding basket body (1) at the bottom, a pump body (5) connected to the water outlet end of the main water outlet pipe (51), and a water supply pipe located at the top layer and supplying water to each breeding basket body (1) at the top layer and connected to the pump body (5), characterized in that: The breeding basket body (1) adopts the breeding basket body (1) as described in any one of claims 1 to 8, and from top to bottom, the first water outlet pipe (11) and / or the second water outlet pipe (12) of each breeding basket body (1) located at the top is directly connected to the top open part of each breeding basket body (1) located at the bottom.

10. A crab breeding area, comprising a pond, characterized in that: The aquaculture system as claimed in claim 9 is arranged in a container (6), and the container (6) is provided with a through-hole (62) for the connecting pipe (61) to pass through, the first end of the connecting pipe (61) is connected to the pond (7), and the second end of the connecting pipe (61) passes through the through-hole (62) and is fluidically connected to the main outlet pipe (51) and the pump body (5).

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