Factory intermediate breeding device for juvenile crabs

Abstract

The utility model discloses a juvenile crab factory-like intermediate cultivation device which is used in the technical field of aquaculture. The device comprises a culture tank and a water supply pipeline with controllable water inflow, the inner bottom surface of the breeding tank is obliquely arranged; a water supply outlet of the water supply pipeline is obliquely aligned to the bottom of the culture tank; the water outlet direction of the water supply outlet is the same as the inclination direction of the culture tank; a sewage outlet for discharging sewage and a juvenile crab collecting opening for collecting juvenile crabs are formed in the bottom of the breeding tank; the dirt outlet and the fry collecting opening are formed in the inclined bottom of the breeding tank, a drainage cover used for preventing crabs from moving is arranged in the dirt outlet, and a fry collecting cover is detachably installed in the fry collecting opening. The residual feed can flow to the inclined bottom to be cleaned intensively, and convenient cleaning of the residual feed is achieved; the juvenile crabs can be driven to the juvenile crab collecting opening, and simple and efficient juvenile crab collecting is achieved; and the quality and the water level of the water body are controllable, so that an observer can clearly observe the feeding condition in the water body.

Description

Technical Field

[0001] The utility model relates to the technical field of aquaculture, in particular to a factory-based intermediate cultivation device for crab larvae. Background Art

[0002] Intermediate cultivation refers to the breeding process in which the seedlings are subjected to a period of transitional cultivation (or standardization) before breeding (stocking) in order to improve the survival rate of breeding. This is undoubtedly an effective technical measure for blue crabs whose seedling sources are unstable and restricted by natural sea areas. It has the advantages of planned seedling collection, shortening the pond breeding cycle, effectively alleviating the contradiction between seedling supply and demand, and scientifically and efficiently utilizing limited seedling resources.

[0003] To this end, domestic and foreign scholars and practitioners have made various attempts for different breeding purposes and adopted different breeding models. The most representative of these are earthen pond cultivation and cage hanging cultivation, which have achieved certain results. Among them, earthen pond cultivation refers to the method of placing aquatic animals such as crab larvae in a pond dug from the soil for cultivation, and cage hanging cultivation refers to the method of using cages to raise aquatic animals such as crab larvae in natural water bodies or pond water bodies.

[0004] At present, there are three major problems in earth pond cultivation and cage hanging cultivation. The first is the complexity of cleaning up the leftover bait, which is mainly reflected in the fact that the ponds for earth pond cultivation and cage hanging cultivation are deep and large in area. The leftover bait is easily mixed with crab fry when cleaning, making it difficult to clean up the leftover bait; the second is the difficulty in collecting seedlings. When collecting seedlings, the leftover bait cannot be cleaned in advance, resulting in the leftover bait and crab fry being mixed together, making the collection efficiency low and difficult; the third is the inability to judge the amount of bait fed. Due to the large area and deep water of earth pond cultivation and cage hanging cultivation, it is difficult to observe the distribution and amount of bait. Utility Model Content

[0005] The utility model provides a factory-based intermediate cultivation device for crab larvae, which is used to solve the problems in the prior art of difficulty in cleaning residual bait, difficulty in judging feeding conditions and difficulty in collecting larvae.

[0006] The utility model provides a factory-based intermediate culture device for crab larvae, comprising a culture tank and a water supply pipeline with controllable water inlet;

[0007] The inner bottom surface of the breeding trough is arranged inclined;

[0008] The water supply outlet of the water supply pipeline is tilted and aligned with the bottom of the breeding tank, and the water outlet direction of the water supply outlet is the same as the tilt direction of the breeding tank;

[0009] The bottom of the breeding tank is provided with a sewage outlet for discharging sewage and a seedling collection port for collecting crab larvae; the sewage outlet and the seedling collection port are both arranged at the inclined bottom of the breeding tank, a drainage cover for preventing crabs from escaping is provided in the sewage outlet, and a seedling collection cover is detachably installed in the seedling collection port.

[0010] In one embodiment, the water supply pipeline includes a first water pump and a plurality of first water pipes;

[0011] The plurality of first water pipes are all connected to the first water pump through pipelines, the plurality of first water pipes are all installed above the breeding tank, and the plurality of first water pipes are arranged in parallel;

[0012] The first water pipe has a plurality of water supply outlets, and each of the plurality of water supply outlets is connected to a nozzle.

[0013] In one embodiment, the water supply pipeline further includes a second water pipe;

[0014] The second water pipe is wound around the inner circumferential wall of the breeding tank. The second water pipe is provided with a plurality of cleaning water outlets, and the plurality of cleaning water outlets are all aligned with the inner wall of the breeding tank.

[0015] In one of the embodiments, the water supply pipeline further includes a second water pump;

[0016] The second water pipe is connected to the second water pump through a pipeline, and the second water pipe is not connected to the first water pipe.

[0017] In one embodiment, the angle between the water supply axis of the water supply outlet and the horizontal axis is 25-35°, and the angle between the inclined axis of the breeding trough and the horizontal axis is 0.5-5°.

[0018] In one embodiment, the diameter of the seedling collection port is 7~20cm.

[0019] In one embodiment, the opening size of the drain cover is 0.4-0.6 mm.

[0020] In one embodiment, an inner eave is provided on the inner wall of the breeding trough.

[0021] In one embodiment, the factory-based intermediate culture device for crab larvae further comprises a plurality of shelters;

[0022] A plurality of the shields are placed in the breeding tank and are used to prevent crablets from fighting with each other.

[0023] In one embodiment, the sewage outlet is connected to a ball valve.

[0024] It can be seen from the above technical solutions that the present invention has the following advantages:

[0025] The embodiment of the utility model provides a factory-based intermediate cultivation device for crab larvae, comprising a breeding tank and a water supply pipeline with controllable water inlet; the inner bottom surface of the breeding tank is arranged inclined; the water supply outlet of the water supply pipeline is inclined and aligned with the bottom of the breeding tank, and the water outlet direction of the water supply outlet is the same as the inclined direction of the breeding tank; the bottom of the breeding tank is provided with a sewage outlet for discharging sewage and a seedling collection port for collecting crab larvae; the sewage outlet and the seedling collection port are both provided at the inclined bottom of the breeding tank, the sewage outlet is provided with a drainage cover for preventing crabs from running away, and the seedling collection port is detachably provided with a seedling collection cover, so when in use, when cleaning residual bait, since the water outlet direction is consistent with the inclined direction of the inclined surface, that is, the water flows along the same path as the inclined surface, the water flow plus the effect of the inclined surface makes the residual bait easily slide into the breeding tank. The sloping bottom of the breeding tank is discharged through the sewage outlet at the inclined bottom. The remaining bait that has not been discharged through the sewage outlet can also be cleaned up manually, so that the residual bait is conveniently cleaned up. When collecting crab seedlings, the seedling collection cover on the seedling collection port can be removed, and a seedling collection tube or other containing device can be placed at the bottom of the seedling collection port. Then all the crab seedlings are driven to the seedling collection port, and the crab seedlings will fall from the seedling collection port into the seedling collection tube, so that simple and efficient seedling collection can be achieved. When judging the feeding situation, since the water in the breeding tank is constantly flowing, the water inlet can be controlled by the water supply pipeline, the water quality and water level can be controlled, and the observer can clearly observe the feeding situation in the water body, which effectively solves the problems of difficulty in cleaning residual bait, difficulty in judging the feeding situation and difficulty in collecting seedlings in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 A schematic diagram of the overall structure of a crab larvae factory-based intermediate cultivation device provided by an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the water supply pipeline structure of a crab larvae factory-based intermediate cultivation device provided by an embodiment of the utility model;

[0029] Figure 3 This is a schematic structural diagram of a drainage cover for a crab larvae factory-based intermediate culture device provided by an embodiment of the utility model.

[0030] Reference numerals:

[0031] 1. Breeding trough; 10. Sewage outlet; 11. Seedling collection outlet; 12. Drain cover; 13. Seedling collection cover; 14. Inner eaves; 15. Shelter; 2. Water supply pipeline; 20. First water pipe; 200. Water supply outlet; 21. Second water pipe; 22. Ball valve. DETAILED DESCRIPTION

[0032] The embodiment of the utility model provides a factory-based intermediate cultivation device for crab larvae, which is used to solve the problems in the prior art of difficulty in cleaning residual bait, difficulty in judging feeding conditions, and difficulty in collecting larvae.

[0033] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 3 The utility model provides a crab larvae factory intermediate cultivation device, comprising a breeding tank 1 and a water supply pipeline 2;

[0035] The inner bottom surface of the breeding tank 1 is arranged inclined;

[0036] The water supply outlet 200 of the water supply pipe 2 is tilted and aligned with the bottom of the breeding tank 1, and the water outlet direction of the water supply outlet 200 is the same as the tilt direction of the breeding tank 1;

[0037] The bottom of the breeding tank 1 is provided with a sewage outlet 10 for discharging sewage and a seedling collection port 11 for collecting crab larvae; the sewage outlet 10 and the seedling collection port 11 are both arranged at the inclined bottom of the breeding tank 1, and a drainage cover 12 for preventing crabs from escaping is provided in the sewage outlet 10, and a seedling collection cover 13 is detachably installed in the seedling collection port 11.

[0038] In actual application, seedlings and bait are placed in the breeding trough 1 according to the breeding rules, and the water supply pipe 2 supplies water to the breeding trough 1 regularly. The bait forms residues after the seedlings gnaw or eat. The residues will flow to the bottom of the slope under the action of water flow and the inclined surface. The residues with small diameters will be discharged from the drain port through the drain cover 12, and the residues with large diameters can be manually cleaned up. The bait placement and cleaning are repeated every day until the seedlings complete this transitional cultivation stage (coarse stage). The seedling collection cover 13 is removed from the seedling collection port 11, and a collection device is placed under the seedling collection port 11. The crab larvae are driven into the seedling collection port 11, and the crab larvae fall from the seedling collection port 11 into the collection device to complete the collection. In this process, the purpose of centralized feeding and improving the survival rate and health of the crab larvae is achieved.

[0039] After adopting this structural setting, the above embodiment has at least the following advantages: First, after the outflow water flow and the inclined surface are arranged in the same direction, the dead objects on the inclined surface are easily rolled down to the bottom of the inclined surface under the impact of the water flow, so the residue will flow to the bottom of the inclined surface under the action of the water flow and the inclined surface, and the residue with small diameter will be discharged from the drain port through the drain cover 12, and the residue with large diameter can be cleaned up by manual scoop net. The residue or uneaten bait that stays in place due to excessive weight can also be cleaned up manually at a single point, so that the residual bait can be cleaned up conveniently, without the need to repeatedly salvage it in the earthen pond or cage, without large movements, and without having to remove the crab larvae from the residual bait. The separation step of removing the bait from the bait makes the cleaning of the residual bait more convenient; second, when collecting seedlings, it is only necessary to remove the seedling collecting cover 13 on the seedling collecting port 11, and place a seedling collecting tube or other accommodating device at the bottom of the seedling collecting port 11, and then drive all the crab fry to the seedling collecting port 11, and the crab fry will fall from the seedling collecting port 11 into the seedling collecting tube. It can be ensured by observation that each crab fry is collected, thereby achieving simple and efficient seedling collection, without the need to repeatedly salvage the crab fry in the earthen pond or cage, and then separate the crab fry from the residual bait, so that the collection of crab fry seedlings is more efficient; third, the water in the breeding tank 1 is constantly flowing, and the water quality and water level of the water body are controllable, so that the breeder can clearly observe the feeding situation in the water body.

[0040] Compared with an intensive crab farming device in the prior art (Announcement No. CN104304144B), which is a one-crab-one-box farming model formed by stacking multiple devices and then placing a crab in each device for farming, this device is relatively troublesome to feed, clean, and collect the crabs. It is necessary to repeatedly clean or collect multiple devices, which seriously affects efficiency. In this solution, the tilted arrangement of the farming troughs, combined with the setting of the water supply pipeline, can achieve the cleaning of residual bait and the centralized collection of crab fry, effectively improving the survival rate and health of the crab fry. Compared with the prior art farming device for the intermediate cultivation of blue crab fry, the support frame is used to divide the farming container into multiple accommodating chambers, and the crab fry are then placed in different accommodating chambers. It also requires repeated cleaning or collection of multiple accommodating chambers, which cannot achieve efficient cleaning and collection.

[0041] As a possible example, in this embodiment, if Figure 1 and Figure 2As shown, a feasible structure of a water supply pipeline 2 is further provided; the water supply pipeline 2 includes a first water pump and multiple first water pipes 20, the multiple first water pipes 20 are connected to the water storage tank through a pipeline, the pipeline is also connected to the first water pump, the first water pipe 20 has multiple water supply outlets 200, the multiple first water pipes 20 are all erected above the breeding tank 1, the multiple first water pipes 20 are perpendicular to the long sides of the breeding tank 1, the multiple first water pipes 20 are arranged in parallel to form multiple "H"-shaped layout patterns, and the water supply outlets 200 of the multiple first water pipes 20 are all connected with nozzles. In actual application, the first water pump draws water into the multiple first water pipes 20, and the water is sprayed out through the nozzles of the multiple first water pipes 20 to form an array-type water spray flow, which increases the fluidity and flow area of ​​the water flow on the inclined surface, and improves the cleaning effect of residue and wastewater.

[0042] Specifically, the first water pipes 20 preferably use PVC pipes with a diameter of 25, and each first water pipe 20 is spaced 2 meters apart.

[0043] Further, such as Figure 1 and Figure 2 As shown, in order to clean the breeding tank 1 and the residue and waste at the edge of the tank body, the water supply pipeline 2 also includes a second water pipe 21; the second water pipe 21 is arranged around the inner wall of the breeding tank 1 to form an "n" type arrangement. The second water pipe 21 is provided with a plurality of cleaning water outlets, and the plurality of cleaning water outlets are all aimed at the inner wall of the breeding tank 1. In actual application, the water flowing out of the cleaning water outlet will continuously flush the inner wall of the breeding tank 1, and concentrate the residue and waste at the edge of the tank body to the center of the bottom of the tank. In combination with the flushing of the bottom of the tank by the water flow of the first water pipe 20, the inner tank surface of the breeding tank 1 can be cleaned, and the residue and waste in the center of the tank body can be flushed to the sewage floor drain.

[0044] Furthermore, in order to improve the cleaning effect of the inner wall, the diameter of the cleaning water outlet is smaller than that of the water supply outlet 200 and is densely distributed, so that the cleaning effect of the inner wall of the breeding tank 1 is better.

[0045] It should be pointed out that the second water pipe 21 can be connected to the first water pipe 20, that is, the water in the second water pipe 21 can be pumped by the first water pump, or the second water pipe 21 can be not connected to the first water pipe 20, that is, the second water pipe 21 is connected to another second water pump, and water is pumped by the second water pump.

[0046] In a specific embodiment, the water supply pipeline 2 also includes a second water pump, the second water pipe 21 is connected to the second water pump through the pipeline, the second water pipe 21 is connected to the water tank, and the second water pipe 21 and the first water pipe 20 are not connected to each other. In actual application, the water in the second water pipe 21 is pumped by the second water pump.

[0047] Based on the above embodiment, in a specific application scenario, the timed working time of the first water pump is set, and the timed working time of the second water pump is set, wherein the working times of the first water pump and the second water pump are staggered. For example, the first water pump starts to be powered on at 0 o'clock, runs for 1 hour and 50 minutes, and then powers off for 2 hours and 10 minutes. The second water pump starts to be powered on at 2 o'clock in the morning, and the power-on and power-off time are consistent with the first water pump. The first water pump and the second water pump can serve the purpose of alternating work. On the one hand, the water level in the breeding tank 1 changes regularly from preset water level to emptying water level to preset water level. On the other hand, it can save the use time of the equipment and extend the life of the equipment.

[0048] The regular change of the water level is reflected in the following: during the water supply interval, the water level in the tank drops to 0 cm after flowing out through the floor drain; after the next water supply period begins, the water level gradually rises, so that the water level is within the range of 5 to 10 cm. The purpose of this change is to ensure that the water level can meet the free movement and foraging of crab larvae, while allowing the water in the tank to be drained during the water supply interval to carry out all the dirt. As for the total unit water supply of the two pipes, it can be controlled to be almost the same by adjusting the three-way ball valve 22, so that the water level of the two sets of pipes can be within the range of 5 to 10 cm during water supply.

[0049] It should be pointed out that the device that controls the timing of the first water pump is a Jinkede timer. The two timers are connected to the water pump and the power supply respectively. Their main function is to cut off the power alternately at a certain time so that the two water pipes can run alternately.

[0050] As a possible example, in this embodiment, if Figure 1 As shown, a specific structure of a breeding trough 1 is further provided. The bottom of the breeding trough 1 is connected with a raising block. The breeding trough 1 is tilted as a whole through the raising block, thereby realizing the inclined arrangement of the inner bottom surface of the breeding trough 1. In actual application, due to the inclined arrangement of the inner bottom surface, combined with the water flow sprayed in the same direction, the residue flows to the bottom along the water, and the concentration effect is good.

[0051] Specifically, the breeding tank 1 is made of polypropylene material. The breeding tank 1 is 6m long, 1.2m wide and 0.3m high. The surface of the breeding tank 1 formed by the polypropylene material is a light-colored surface, which is convenient for users to observe the crab larvae. The setting of 0.3m in height can make the depth of the water tank not deep, which is also conducive to observing the crab larvae on the bottom of the tank.

[0052] In a specific embodiment, the angle between the water supply axis of the water supply outlet 200 and the horizontal axis is 25~35°. Preferably, the angle between the water supply axis of the water supply outlet 200 and the horizontal axis is 30°, and the angle between the inclined axis of the breeding trough 1 and the horizontal axis is 0.5~5°. When the length of the breeding trough 1 is longer, the angle between the inclined axis of the breeding trough 1 and the horizontal axis is preferably 0.5°. When the length of the breeding trough 1 is shorter, the angle between the inclined axis of the breeding trough 1 and the horizontal axis is preferably 5°, so as to form a slightly inclined breeding trough 1. In actual application, the slightly inclined breeding trough 1 will not hinder the activity of the crab larvae, and can flush the residue to the inclined bottom with the flushing of the water flow.

[0053] In a specific embodiment, Figure 1 As shown, the inclined bottom of the breeding tank 1 is provided with a seedling collecting port 11, and the diameter of the seedling collecting port 11 is 7-20 cm. The size of the seedling collecting port 11 is determined according to the size of the crab larvae to be raised so that the crab larvae can pass through the seedling collecting port 11. The seedling collecting cover 13 on the seedling collecting port 11 can be a completely closed cover or a cover with a water-passing gap, but the size of the water-passing gap should be smaller than the size of the crab larvae.

[0054] In a specific embodiment, Figure 1 As shown, the inclined bottom of the breeding tank 1 is provided with at least two sewage outlets 10, and the two sewage outlets 10 are arranged relatively along the same axis of the breeding tank 1. The two sewage outlets 10 can better collect the residual bait on the edges of both sides. The opening size of the drainage cover 12 on the sewage outlet 10 is 0.4~0.6mm, so that the crab larvae cannot escape from the pores of the drainage cover 12. The sewage discharged from the sewage outlet 10 can flow to other types of sewage treatment devices, thereby achieving water purification and subsequent recycling.

[0055] Further, such as Figure 1 As shown, in order to allow the sewage outlet 10 to better connect to the pipeline, a floor drain is provided in the sewage outlet 10, a drain cover 12 is installed on the top of the floor drain, and the bottom of the floor drain can be connected to the pipeline, for example, the floor drain can be connected to the water inlet pipe of the sewage treatment device.

[0056] In a specific embodiment, Figure 1 As shown, in order to prevent the crab larvae from escaping from the wall of the breeding tank 1, an inner eave 14 is provided on the inner peripheral wall of the breeding tank 1. In actual use, when the crab larvae climb up from the tank wall, they will hit the inner eave 14 and then fall back into the breeding tank 1. Therefore, the setting of the inner eave 14 can effectively prevent the crab larvae from climbing out of the tank wall.

[0057] Specifically, the width of the inner eaves 14 extending inwardly is 4.5 cm.

[0058] In a specific embodiment, Figure 1As shown, in order to prevent the crablets from fighting each other, a plurality of shields 15 are provided in the breeding tank 1. In actual use, the crablets can hide in the shields 15 to prevent fighting each other, thereby improving the survival rate of the crablets.

[0059] Specifically, the shelter is preferably a leech plastic board shelter, which provides shading and shelter for the crablets, thereby reducing the frequency of crablets fighting and providing space for crablets to avoid each other during the molting period, and is evenly arranged in the trough.

[0060] In a specific embodiment, in order to better control the water level in the breeding tank 1, the sewage outlet 10 is connected to a ball valve 22. In actual application, when the water level of the breeding tank 1 needs to be adjusted, on the one hand, the water pump is controlled to control the water inlet of the breeding tank 1, and on the other hand, the water outlet of the breeding tank 1 is controlled by the ball valve 22 of the sewage outlet 10, thereby achieving water level adjustment. That is, through the water supply pipeline 2, the sewage outlet and the drainage ball valve 22, after the pipeline starts to supply water, the water level of the tank body is controlled within 5 to 10 cm during the water supply period (1 hour and 50 minutes of alternating water supply by two sets of pipelines is the water supply period; 10 minutes of no water supply by both sets of pipelines is the water supply interval) to ensure the free movement and foraging of crab larvae.

[0061] Based on the above embodiments and the existing device, a comparative experiment and an experiment of the present device were set up.

[0062] In the comparative experiment, earthen pond cultivation was used. After 7 days of cultivation at a water temperature of 28.5-32.5°C, the survival rate was 66%. However, there were problems such as the effectiveness of feed feeding, quantification of the breeding environment, bottom soil and inconvenience in collecting seedlings.

[0063] In the experiment of this device, three batches of 1,000 crab larvae were released on June 20, July 10, and February 27, respectively, and white clams were fed throughout the process. The device was cultivated for 15 days under the condition of daily water temperature of 28.4-31.2°C. The verification results are as follows: the survival rates were 63.2%, 40.2%, and 66.9%, respectively, and the molting rates were 40.4%, 42.6%, and 39.6%, respectively. The ammonia nitrogen in the breeding water was maintained at 0 and the nitrite was <0.15 throughout the process. The survival rate was higher when the time was longer. It is also simple to operate and convenient to collect seedlings. Dead crabs and leftover bait can be collected, which is far better than the verification effect of existing technologies.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0065] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A factory-scale intermediate culture device for crab larvae, comprising a culture tank and a water supply pipeline with controllable water inlet; Its characteristics are: The inner bottom surface of the breeding trough is arranged inclined; The water supply outlet of the water supply pipeline is tilted and aligned with the bottom of the breeding tank, and the water outlet direction of the water supply outlet is the same as the tilt direction of the breeding tank; The bottom of the breeding tank is provided with a sewage outlet for discharging sewage and a seedling collection port for collecting crab larvae; the sewage outlet and the seedling collection port are both arranged at the inclined bottom of the breeding tank, a drainage cover for preventing crabs from escaping is provided in the sewage outlet, and a seedling collection cover is detachably installed in the seedling collection port.

2. The crab factory intermediate cultivation device according to claim 1, characterized in that: The water supply pipeline includes a first water pump and a plurality of first water pipes; The plurality of first water pipes are all connected to the first water pump through pipelines, the plurality of first water pipes are all installed above the breeding tank, and the plurality of first water pipes are arranged in parallel; The first water pipe has a plurality of water supply outlets, and each of the plurality of water supply outlets is connected to a nozzle.

3. The crab factory intermediate cultivation device according to claim 2, characterized in that: The water supply pipeline also includes a second water pipe; The second water pipe is wound around the inner circumferential wall of the breeding tank. The second water pipe is provided with a plurality of cleaning water outlets, and the plurality of cleaning water outlets are all aligned with the inner wall of the breeding tank.

4. The crab factory intermediate cultivation device according to claim 3, characterized in that: The water supply pipeline also includes a second water pump; The second water pipe is connected to the second water pump through a pipeline, and the second water pipe is not connected to the first water pipe.

5. The crab larvae factory-based intermediate cultivation device according to claim 1, characterized in that: The angle between the water supply axis of the water supply outlet and the horizontal axis is 25-35°, and the angle between the inclined axis of the breeding trough and the horizontal axis is 0.5-5°.

6. The crab fry factory intermediate cultivation device according to claim 1, characterized in that: The diameter of the seedling collecting port is 7 to 20 cm.

7. The factory-based intermediate cultivation device for crab larvae according to claim 1, characterized in that: The opening size of the drain cover is 0.4~0.6mm.

8. The factory-based intermediate cultivation device for crab larvae according to claim 1, characterized in that: An inner eave is provided on the inner peripheral wall of the breeding trough.

9. The crab larvae factory-based intermediate cultivation device according to claim 1, characterized in that: The factory-based intermediate cultivation device for crab larvae further comprises a plurality of shields, which are placed in the cultivation tank.

10. The factory-based intermediate cultivation device for crab larvae according to claim 1, characterized in that: The sewage outlet is connected with a ball valve.

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