A fish grading and compartmenting system and method suitable for use in a hatchery vessel
By setting up fish transport channels, compartmentation components, and fish gathering and grading components inside the aquaculture vessel, the problem of difficult grading and compartmentation operations has been solved, achieving efficient grading and compartmentation of fish, ensuring healthy growth and high survival rate of fish, and promoting the mechanization and automation of aquaculture vessel compartmentation mode.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 国信工船(青岛)海洋科技有限公司
- Filing Date
- 2024-07-01
- Publication Date
- 2026-05-15
AI Technical Summary
In the existing aquaculture vessel compartment rearing model, the grading and compartmenting operation is difficult, labor-intensive, and easily damages the fish. The operation time is also long, which leads to a slowdown in fish growth and an increase in mortality, making it difficult to achieve mechanization, automation and high survival rate of the catch.
A fish grading and compartmenting system was designed, including a fish transport channel component, a compartmenting component, and a fish gathering and grading component. The system utilizes a fish gathering net and a pull net rope combined with a traction device to achieve fish grading and compartmenting through mechanization, reducing the impact of human factors.
This has enabled efficient grading and compartmentalization of fish, reduced labor intensity, ensured the healthy growth and high survival rate of fish, and promoted the healthy and sustainable development of large-scale aquaculture vessel compartmentalization model.
Smart Images
Figure CN118765846B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of deep-sea aquaculture equipment technology, and relates to a deep-sea aquaculture vessel equipment and method, specifically to a fish grading and compartmenting system and method suitable for the compartmentalized aquaculture vessel. Background Technology
[0002] Deep-sea waters have significant advantages such as abundant fishery resources, high-quality water sources, suitable water temperatures, and freedom from land-based pollution and diseases. They provide excellent conditions for large-scale marine aquaculture and logistics processing and supply, and represent a new space for the development of modern aquaculture and the marine economy.
[0003] Aquaculture vessels are one of the core pieces of equipment for developing deep-sea aquaculture projects. They can reach deep-sea areas inaccessible to ordinary aquaculture cages, possessing significant economic and social value. The applicant currently operates the world's first 100,000-ton fully enclosed, cruiseable large-scale aquaculture vessel, which is currently the world's largest, most functional, practical, and reliable deep-sea aquaculture equipment. The vessel contains several large aquaculture tanks, shaped like wide-mouthed bottles with an octagonal cross-section. These tanks exchange water with external seawater via circulating pumps. Each tank can reach a depth of 15 meters and can raise over 100 tons of adult fish. Using aquaculture vessels for fish farming can significantly increase fish yields.
[0004] Aquaculture vessel culture, as an important form of modern marine aquaculture, relies on creating a suitable growth environment for marine organisms through mobile operations. However, current aquaculture vessel culture faces challenges in grading and compartmentalizing these organisms, making effective operation difficult. This results in farmed aquatic products growing in unsuitable environments, leading to adverse consequences such as slower growth rates and increased mortality rates, severely hindering overall technological progress.
[0005] Grading and compartmentalization aim to meet the diverse environmental needs of marine organisms at different growth stages and species. However, the large surface area, depth, and large catch volume of aquaculture vessels in enclosed shipboard aquaculture operations present significant challenges to grading and compartmentalization. Traditional net-based grading methods are not only labor-intensive and prone to damaging fish, but also time-consuming, potentially causing prolonged stress and even death from oxygen deprivation. Therefore, developing new and efficient grading and compartmentalization methods is urgently needed to achieve mechanization and automation in catch enhancement, minimize the impact of human factors on the production process, ensure high survival rates and minimal damage to catches, and thus promote the healthy and sustainable development of large-scale aquaculture vessel compartmentalization.
[0006] Patent CN208807378U discloses a fish sorting and herding device for an aquaculture vessel, belonging to the field of fishery equipment technology. The inner wall of the aquaculture vessel is fixed with a track, and a guide wheel is provided on the side of the net hanging frame. The guide wheel is rotatably connected to the track, and the net hanging frame is fixedly connected with a steel wire rope. A drive device located on the inner wall of the aquaculture vessel drives the net hanging frame to move within the aquaculture vessel via the steel wire rope. Fishing nets are installed on the net hanging frame. The effects are: to sort fish by size within the aquaculture vessel, ensuring aquaculture quality and controlling fish populations; to allow for the installation of fishing nets with different mesh sizes on the net hanging frame, classifying fish of different sizes to ensure aquaculture quality while reducing the probability of larger fish eating smaller fish and ensuring the growth rate of juvenile fish; and to drive the farmed fish to the fish suction pump side during fishing, increasing fish density and improving harvesting efficiency. However, the technical solution of this patent has many insurmountable drawbacks in practical application. First, the hanging net frame is a rigid structure with a large size, which occupies a large space in the cabin when not in use and will cause harm to the organisms in the cabin. Second, there is a large water body distributed in the longitudinal direction in the cabin, and the fish suction pump is only located at one point in the longitudinal water body. After the hanging net frame drives the fish, only a small number of fish are driven to the vicinity of the fish suction pump, which cannot achieve effective capture. Summary of the Invention
[0007] To address the shortcomings of the existing technologies, this invention provides a fish grading and compartmenting system and method suitable for aquaculture vessel compartment rearing mode. It is suitable for the compartment rearing environment of aquaculture vessels, can effectively realize fish grading and compartment rearing operations, and has the characteristics of high feasibility and low labor intensity.
[0008] The present invention discloses a fish grading and compartmenting system suitable for aquaculture vessel compartment rearing, comprising two adjacent rearing compartments, and further comprising:
[0009] Fish transport channel assembly, used to connect the upper parts of the two aquaculture tanks;
[0010] One of the aquaculture tanks is longitudinally divided into a compartment area and a fish grading area;
[0011] The compartment area is equipped with a compartment component, which is used to transfer fish that have been graded by the fish gathering and grading component to another aquaculture compartment through the fish transport channel component.
[0012] The fish grading area is equipped with a fish grading component, which is used to grade the fish in the breeding tank and gather the graded fish to the compartment separation component. The fish grading component has a fish gathering net, one end of which is a fixed end located at one end of the interface between the compartment separation area and the fish grading area, and the other end of which is a movable end that can move along the inner wall of the breeding tank in the fish grading area from one end of the interface between the compartment separation area and the fish grading area to the other end of the interface.
[0013] As a preferred embodiment, the fish transport channel assembly includes a fish transport pipe connecting the upper parts of the two aquaculture tanks, as well as a valve and a fish fry counter installed on the fish transport pipe.
[0014] As a preferred embodiment, the compartment assembly includes a bottom net, pull net ropes, and a traction device, wherein the bottom net is located at the bottom of the compartment area, and the bottom net is connected to the traction device above by a plurality of pull net ropes provided on its outer edge.
[0015] As a preferred embodiment, the mesh rope is a nylon rope or a steel wire rope.
[0016] As a preferred embodiment, the traction device is a winch.
[0017] As a preferred embodiment, the fish-gathering and grading assembly further includes a fixed net-rolling device, a movable net-pulling device, and a track. The fixed net-rolling device includes a fixed frame, a rotating shaft, and a net-rolling motor. The rotating shaft is vertically arranged within the fixed frame and connected to the fixed end of the fish-gathering net, with the netting capable of being wound around the rotating shaft. The net-rolling motor is located at the top of the fixed frame, and its motor shaft is connected to the rotating shaft via a coupling. The fixed frame is fixedly connected to the inner wall of the adjacent aquaculture chamber. The movable net-pulling device includes a movable frame, a traction shaft, and a traveling mechanism. A vertically arranged traction shaft is fixedly installed within the movable frame and connected to the movable end of the fish-gathering net. The movable frame is equipped with a traveling mechanism that cooperates with the track. The track extends along the inner wall of the aquaculture chamber in the fish-gathering and grading area from one end of the interface between the compartment area and the fish-gathering and grading area to the other end of the interface.
[0018] Furthermore, the walking mechanism includes a drive motor, a transmission shaft, a drive gear, a limiting frame, and limiting wheels. The drive motor is located on the top of the moving frame, the transmission shaft is vertically arranged inside the moving frame, the motor shaft of the drive motor is connected to the transmission shaft via a coupling, the drive gear is keyed to the transmission shaft, the limiting frame is mounted on the transmission shaft via bearings, and the limiting frame is equipped with slidable limiting wheels. The track is a rack track with limiting grooves formed on its side. The drive gear meshes with the rack track, and the limiting wheels are located within the limiting grooves.
[0019] This invention also provides a method for using a fish grading and compartmenting system suitable for aquaculture vessel-based container farming, which is carried out according to the following steps:
[0020] (1) Select a fish-attracting net with a suitable mesh size according to the grading and specification requirements of the fish;
[0021] (2) The moving end and the fixed end of the fish-gathering net are both located at one end of the interface between the compartment area and the fish-gathering and grading area. The moving end of the fish-gathering net moves along the inner wall of the breeding compartment in the fish-gathering and grading area from one end of the compartment area to the other end of the interface. During the movement, the fish in the breeding compartment are graded by the sieving of the fish-gathering net, and the fish that meet the grading specifications gather in the compartment area.
[0022] (3) The compartmentation component will transfer the graded fish to another aquaculture compartment through the fish transport channel component.
[0023] As a preferred embodiment, a method for using a fish grading and compartmenting system suitable for aquaculture vessel-based culture mode is as follows:
[0024] (1) Select a fish-attracting net with a suitable mesh size according to the grading and specification requirements of the fish;
[0025] (2) Both the fixed net rolling device and the mobile net pulling device are located at one end of the interface between the compartment area and the fish grading area. When the walking mechanism is started, the mobile net pulling device moves along the track, driving the moving end of the fish grading net to move to the other end of the compartment area and the fish grading area. During the movement, the net rolling motor is controlled to roll back the fish grading net, keeping the fish grading net stretched between the fixed net rolling device and the mobile net pulling device in a taut state. At the same time, the fish in the breeding compartment are graded by the screening of the fish grading net, and the fish that meet the grading specifications gather in the compartment area.
[0026] (3) The compartmentation component will transfer the graded fish to another aquaculture compartment through the fish transport channel component.
[0027] The advantages of this invention are:
[0028] (1) By setting up fish grading components, fish in the aquaculture tank can be graded and fish that meet the grading specifications can be gathered in the compartment area; by setting up compartment components and fish transport channel components, the graded fish can be transferred to another aquaculture tank, thereby achieving the management goal of grading and compartmenting in the aquaculture tank environment. This measure helps fish grow healthily in a more suitable growth environment, thereby ensuring their high survival rate.
[0029] (2) When not in use, the fixed net rolling device and the mobile net pulling device are both located at one end of the interface between the compartment area and the fish gathering and grading area. The fish gathering net is rolled on the rotating shaft, and the compartment components are located at the bottom of the aquaculture compartment. The whole system occupies little space in the compartment and will not cause damage to the fish in the compartment.
[0030] (3) The whole system achieves mechanized and automated operation, minimizing the impact of human factors on the production process. The complete process is short and can effectively promote the healthy and sustainable development of large-scale aquaculture vessel-based aquaculture mode. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the structure of the present invention;
[0033] Figure 2 for Figure 1 Schematic diagram of the structure of the Zhongjuyu grading component;
[0034] Figure 3 for Figure 2 Enlarged structural diagram at point A;
[0035] Figure 4 The usage state of the present invention Figure 1 ;
[0036] Figure 5 The usage state of the present invention Figure 2 ;
[0037] Figure 6 The usage state of the present invention Figure 3 ;
[0038] Figure 7 The usage state of the present invention Figure 4 ;
[0039] In the diagram: 1. Fixed net rolling device; 2. Mobile net pulling device; 3. Track; 4. Compartment assembly; 5. Fish transport channel assembly; 6. Aquaculture compartment; 7. Fish gathering net; 11. Net rolling motor; 12. Fixed frame; 13. Rotating shaft; 21. Drive motor; 22. Transmission shaft; 23. Limiting frame; 24. Limiting wheel; 25. Drive gear; 26. Moving frame; 27. Traction shaft; 28. Limiting groove; 41. Traction device; 42. Net pulling rope; 43. Bottom net; 51. Valve; 52. Fish fry counter; 53. Fish transport pipe. Detailed Implementation
[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0041] In the description of this invention, it should be noted that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0043] Example 1:
[0044] like Figures 1-3 As shown, a fish grading and compartmenting system suitable for aquaculture vessel-based culture mode includes two adjacent culture compartments 6, and also includes:
[0045] The fish transport channel assembly 5 connects the upper parts of the two aquaculture tanks 6, including a fish transport pipe 53 connecting the upper parts of the two aquaculture tanks 6, and a valve 51 and a fish fry counter 52 installed on the fish transport pipe 53. The valve 51 is only open when the tanks are separated, and the fish fry counter 52 can effectively count the number of fish in the separated tanks, which is convenient for refined management.
[0046] Among them located Figure 1 The aquaculture tank 6 on the left side is longitudinally divided into a compartment area and a fish grading area. The fish grading area and the compartment area are not physically separated, but are mainly divided by the functional areas of the components within each area.
[0047] A compartmentation assembly 4 is installed within the compartmentation area. This assembly is used to separate fish graded by the fish gathering and grading assembly into another aquaculture compartment 6 via a fish transport channel assembly 5. The compartmentation assembly 4 includes a bottom net 43, pull net ropes 42, and a traction device 41. The bottom net 43 is located at the bottom of the compartmentation area and is connected to the traction device 41 above it via several pull net ropes 42 attached to its outer edge. The traction device 41 pulls the bottom net 43 upwards, driving the fish to the opening of the fish transport pipe 53 and further transferring them to the aquaculture compartment 6 on the right.
[0048] Furthermore, the netting rope 42 is made of nylon rope. The traction device 41 is a winch, which can be placed on the walkway inside the aquaculture tank 6, fixed to the inner wall of the aquaculture tank 6, or located on the top deck; the applicant does not impose any restrictions. The applicant does not impose any restrictions on the materials or components used for the netting rope 42 and the traction device 41, as long as they meet the basic functions.
[0049] The fish grading area is equipped with a fish grading component, which is used to grade the fish in the aquaculture tank 6 and gather the graded fish to the tank separation component 4. This fish grading component includes a fish-gathering net 7, a fixed net-rolling device 1, a movable net-pulling device 2, and a track 3. Details are as follows:
[0050] Furthermore, one end of the fish-gathering net 7 is a fixed end located at one end of the interface between the compartment area and the fish-gathering grading area, while the other end of the fish-gathering net 7 is a movable end that can move along the inner wall of the aquaculture compartment 6 in the fish-gathering grading area from one end of the interface between the compartment area and the fish-gathering grading area to the other end of the interface.
[0051] Furthermore, the fixed net-rolling device 1 includes a fixed frame 12, a rotating shaft 13, and a net-rolling motor 11. The rotating shaft 13 is vertically arranged inside the fixed frame 12 and is connected to the fixed end of the fish-gathering net 7. The netting of the fish-gathering net 7 can be rolled onto the rotating shaft 13. The net-rolling motor 11 is located at the top of the fixed frame 12, and the motor shaft of the net-rolling motor 11 is connected to the rotating shaft 13 via a coupling. The fixed frame 12 is fixedly connected to the inner wall of the adjacent aquaculture chamber 6. The fixed net-rolling device 1 remains stationary within the aquaculture chamber 6 and cooperates with the movable net-pulling device 2 to achieve the extension and retraction of the fish-gathering net 7.
[0052] Furthermore, the mobile net-pulling device 2 includes a mobile frame 26, a traction shaft 27, and a traveling mechanism. The mobile frame 26 has a vertically arranged traction shaft 27 fixedly installed inside it, and the traction shaft 27 is connected to the moving end of the fishing net 7. The mobile frame 26 is equipped with a traveling mechanism that cooperates with the track 3. Furthermore, the traveling mechanism includes a drive motor 21, a transmission shaft 22, drive gears 25, a limiting frame 23, and limiting wheels 24. The drive motor 21 is located at the top of the mobile frame 26, and the transmission shaft 22 is vertically arranged inside the mobile frame 26. The motor shaft of the drive motor 21 is connected to the transmission shaft 22 via a coupling. Two drive gears 25 are keyed to the transmission shaft 22, and a limiting frame 23 is located near each drive gear 25. The limiting frame 23 is mounted on the transmission shaft 22 via bearings, and a slidable limiting wheel 24 is provided on the limiting frame 23.
[0053] Furthermore, the track 3 is a rack and pinion track with two parallel sections, both distributed along the inner wall of the aquaculture chamber 6 in the fish grading area from one end of the interface between the chamber and the fish grading area to the other end. The drive gear 25 meshes with the rack and pinion track in a one-to-one manner. Furthermore, each rack and pinion track has a limiting groove 28 on its side, and the limiting wheel 24 on the adjacent limiting frame 23 is located within the limiting groove 28. In this embodiment, the movement of the mobile net-pulling device 2 is achieved through the meshing of the drive gear 25 and the rack and pinion track. The applicant does not impose any restrictions on the scheme for achieving the movement of the mobile net-pulling device 2, i.e., the coordination method between the walking mechanism and the track 3.
[0054] The following is a method for using a fish grading and compartmenting system suitable for aquaculture vessel-based container farming in this embodiment, which is carried out according to the following steps:
[0055] (1) Select a fish-gathering net 7 with a suitable mesh size according to the fish grading specifications; the valve 51 on the fish transport pipe 53 is closed, and the water level in the left aquaculture tank 6 is higher than that in the right aquaculture tank 6.
[0056] (2) such as Figure 4 As shown, both the fixed net-rolling device 1 and the mobile net-pulling device 2 are located at one end of the interface between the compartment area and the fish-gathering and grading zone. Figures 5-6 As shown, the walking mechanism is activated, driving the gear 25 to mesh with the rack and pinion track. The moving net pulling device 2 moves along the rack and pinion track, driving the moving end of the fish-gathering net 7 to move towards the other end of the compartment area and the fish-gathering grading interface. During the movement, the net-winding motor 11 is controlled to rewind the fish-gathering net 7, keeping the fish-gathering net 7 stretched between the fixed net-winding device 1 and the moving net pulling device 2 in a taut state. At the same time, fish-attracting methods such as sound, light, and feeding are used in the area where the fish-gathering net 7 has moved to induce fish smaller than the mesh size to pass through the fish-gathering net 7 and enter the area where the fish-gathering net 7 has moved. Fish that meet the grading requirements gather in the compartment area, thereby realizing the fish grading operation in the aquaculture compartment 6.
[0057] (3) such as Figure 7 As shown, the mobile netting device 2 moves to the other end of the interface between the compartment area and the fish grading area. At this time, fish that meet the grading specifications gather in the compartment area. Figure 1 As shown, the winch is operated to slowly raise the bottom net 43, while simultaneously opening valve 51 on the fish transfer pipe 53. Due to the level difference, seawater overflows from the left aquaculture tank 6 to the right aquaculture tank 6. The seawater circulation pump in the left aquaculture tank 6 must remain running to ensure that the water level in the left aquaculture tank 6 does not drop. When the bottom net 43 rises to near the opening of the fish transfer pipe 53, it is transferred to the right aquaculture tank 6 under the force of the overflowing seawater, thus realizing the compartmentalization operation after fish grading.
[0058] The above is a detailed description of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
Claims
1. A fish grading and compartmenting system suitable for aquaculture vessel-based culture mode, comprising two adjacent culture compartments, characterized in that, Also includes: Fish transport channel assembly, used to connect the upper parts of the two aquaculture tanks; One of the aquaculture tanks is longitudinally divided into a compartment area and a fish grading area; The compartment area is equipped with a compartment assembly, which is used to transfer fish graded by the fish gathering and grading assembly to another aquaculture compartment through the fish transport channel assembly. The compartment assembly includes a bottom net, pull net ropes and a traction device. The bottom net is located at the bottom of the compartment area and is connected to the traction device above by several pull net ropes set on its outer edge. The fish grading area is equipped with a fish grading component, which is used to grade the fish in the breeding tank and gather the graded fish to the separation tank component. The fish grading component has a fish grading net, one end of which is a fixed end located at one end of the interface between the separation tank area and the fish grading area, and the other end of which is a movable end that can move along the inner wall of the breeding tank in the fish grading area from one end of the interface between the separation tank area and the fish grading area to the other end of the interface. The fish-gathering and grading assembly also includes a fixed net rolling device, a mobile net pulling device, and a track; The fixed net rolling device includes a fixed frame, a rotating shaft, and a net rolling motor. The rotating shaft is arranged vertically inside the fixed frame and is connected to the fixed end of the fish-gathering net. The netting of the fish-gathering net can be rolled up on the rotating shaft. The net rolling motor is located at the top of the fixed frame, and the motor shaft of the net rolling motor is connected to the rotating shaft through a coupling. The fixed frame is fixedly connected to the inner wall of the adjacent aquaculture tank. The mobile netting device includes a mobile frame, a traction shaft, and a traveling mechanism. A vertically arranged traction shaft is fixedly installed inside the mobile frame. The traction shaft is connected to the moving end of the fishing net. A traveling mechanism that cooperates with the track is installed on the mobile frame. The track is distributed along the inner wall of the aquaculture compartment in the fish grading zone, from one end of the interface between the compartment area and the fish grading zone to the other end of the interface.
2. A fish grading and compartmenting system suitable for aquaculture vessel-based container farming as described in claim 1, characterized in that: The fish transport channel assembly includes a fish transport pipe connecting the upper parts of the two aquaculture tanks, as well as valves and a fish fry counter installed on the fish transport pipe.
3. A fish grading and compartmenting system suitable for aquaculture vessel-based container farming as described in claim 1, characterized in that: The mesh rope is either nylon rope or steel wire rope.
4. A fish grading and compartmenting system suitable for aquaculture vessel-based container farming as described in claim 1, characterized in that: The traction device is a winch.
5. A fish grading and compartmenting system suitable for aquaculture vessel-based container farming as described in claim 1, characterized in that: The walking mechanism includes a drive motor, a transmission shaft, a drive gear, a limiting frame, and limiting wheels. The drive motor is located on the top of the moving frame. The transmission shaft is arranged vertically inside the moving frame. The motor shaft of the drive motor is connected to the transmission shaft via a coupling. The drive gear is keyed onto the transmission shaft. The limiting frame is mounted on the transmission shaft via bearings. The limiting frame is equipped with slidable limiting wheels. The track is a rack track with a limiting groove on its side. The drive gear meshes with the rack track for transmission, and the limiting wheel is located in the limiting groove.
6. A method of using the fish grading and compartmenting system as described in claim 1, applicable to aquaculture vessel compartment rearing, characterized in that, Follow these steps: (1) Select a fish-attracting net with a suitable mesh size according to the grading and specification requirements of the fish; (2) Both the fixed net rolling device and the mobile net pulling device are located at one end of the interface between the compartment area and the fish grading area. When the walking mechanism is started, the mobile net pulling device moves along the track, driving the moving end of the fish grading net to move to the other end of the compartment area and the fish grading area. During the movement, the net rolling motor is controlled to roll back the fish grading net, keeping the fish grading net stretched between the fixed net rolling device and the mobile net pulling device in a taut state. At the same time, the fish in the breeding compartment are graded by the screening of the fish grading net, and the fish that meet the grading specifications gather in the compartment area. (3) The compartmentation component will transfer the graded fish to another aquaculture compartment through the fish transport channel component.