Fish harvesting system for a fish farming vessel

Abstract

The utility model discloses a kind of fishery vessel aquaculture cabin fishery system, belong to aquaculture fishery technology field.The system includes rotating shaft, first net and second net.Rotating shaft is fixed in aquaculture cabin, first net is located at the maximum width in cabin, including with the first steel structure framework of fixed rotating shaft and detachable first flexible net.Second net includes the second steel structure framework of rotating connection with rotating shaft and detachable second flexible net.The articulated first adjustable beam and second adjustable beam of second steel structure framework are all segmented, including fixed section, telescopic section and waterproof structure.Two adjustable beams are respectively provided with telescopic device, and can be according to the surface structure of cabin telescopic, so that second steel structure framework is real-time self-adapting when rotating Adhere to bulkhead.The fishery system of aquaculture cabin of fishery vessel aquaculture provided in the utility model is adapted to adhere to the surface in aquaculture cabin by net, realizes aquaculture cabin fishery high-efficiency mechanization, reduces artificial intervention, reduces labor intensity, reduces fish stress damage.

Description

Technical Field

[0001] This utility model belongs to the field of aquaculture vessel harvesting technology, and particularly relates to a system for harvesting adult fish from the aquaculture compartment of an aquaculture vessel. Background Technology

[0002] As a representative of floating aquaculture platforms, aquaculture vessels have huge water volumes in their aquaculture tanks and high adult fish yields. However, traditional manual harvesting methods suffer from high labor intensity, low efficiency, high labor costs, and significant fish damage, necessitating a mechanized and automated harvesting system. In existing technologies, the irregular internal structure of the aquaculture tanks makes it difficult for mobile fish-driving devices to conform to the tank walls, affecting the effectiveness of fish-driving. Therefore, how to adapt mobile nets to irregular tank walls is a pressing technical problem to be solved. Utility Model Content

[0003] In view of the shortcomings of the related technologies, the purpose of this utility model is to provide a system for harvesting adult fish from the aquaculture tank of an aquaculture vessel, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A system for harvesting adult fish from the aquaculture tank of an aquaculture vessel, comprising:

[0006] The rotating shaft is fixed inside the breeding tank;

[0007] The first net is located at the maximum width of the aquaculture container. The first net includes a first steel frame and a first flexible net that is detachably connected to the first steel frame. The first steel frame is fixedly connected to the rotating shaft.

[0008] The second net includes a second steel frame and a second flexible net that is detachably connected to the second steel frame. The second steel frame is rotatably connected to the rotating shaft.

[0009] The second steel structure frame includes a hinged first adjustable beam and a second adjustable beam. Both the first and second adjustable beams are segmented structures, each including a fixed section and a telescopic section, with a waterproof structure between the fixed section and the telescopic section. The first adjustable beam is equipped with a first telescopic device, which is used to extend and retract the first adjustable beam according to the surface structure inside the aquaculture chamber. The second adjustable beam is equipped with a second telescopic device, which is used to extend and retract the second adjustable beam according to the surface structure inside the aquaculture chamber, so that the second steel structure frame adaptively fits the surface inside the aquaculture chamber in real time when rotating around the rotation axis.

[0010] In some embodiments, the second steel frame further includes a first crossbeam, a second crossbeam, and a rotating beam. The rotating beam, the first crossbeam, the first adjustable beam, the second adjustable beam, and the second crossbeam are connected end to end in sequence to form a closed frame structure. The rotating beam is sleeved on the rotating shaft, and the second adjustable beam is hinged to the second crossbeam.

[0011] In some embodiments, the fish harvesting system of the aquaculture vessel's aquaculture compartment also includes a motor, which is located outside the aquaculture compartment at the bottom of the compartment, and the output shaft of the motor is connected to a rotating beam that extends out of the bottom of the aquaculture compartment through a gear mechanism.

[0012] In some embodiments, a sealing device is provided at the location where the rotating beam passes through the bottom of the aquaculture tank to prevent water from leaking out of the aquaculture tank.

[0013] In some embodiments, both the first telescopic device and the second telescopic device are hydraulic telescopic devices, each of which includes a fixed end and a telescopic end; the fixed end of the first telescopic device is fixedly connected to the inner wall of the fixed section of the first adjustable beam, and the telescopic end of the first telescopic device is fixedly connected to the inner wall of the telescopic section of the first adjustable beam; the fixed end of the second telescopic device is fixedly connected to the inner wall of the fixed section of the second adjustable beam, and the telescopic end of the second telescopic device is fixedly connected to the inner wall of the telescopic section of the second adjustable beam.

[0014] In some embodiments, the system further includes an underwater hydraulic pump station, a first pressure sensor, and a second pressure sensor. The first pressure sensor is located on the outer end face of the telescopic section of the first adjustable beam to monitor the contact pressure between the telescopic section of the first adjustable beam and the inner surface of the aquaculture tank in real time and to feed it back to the underwater hydraulic pump station. The underwater hydraulic pump station adjusts the telescopic extension amount of the first telescopic device according to the pressure feedback. The second pressure sensor is located on the outer end face of the telescopic section of the second adjustable beam to monitor the contact pressure between the telescopic section of the second adjustable beam and the inner surface of the aquaculture tank in real time and to feed it back to the underwater hydraulic pump station. The underwater hydraulic pump station adjusts the telescopic extension amount of the second telescopic device according to the pressure feedback.

[0015] In some embodiments, the first flexible net has a mesh bag, the extension direction of which is consistent with the water flow direction in the aquaculture tank.

[0016] In some embodiments, the net bag is provided with floats so that the net bag is positioned above the first flexible net.

[0017] In some embodiments, the fish harvesting system in the aquaculture vessel's aquaculture compartment also includes a fish suction pump with a fish suction pipe connected to a net bag at the end of the suction pipe.

[0018] In some embodiments, both the first steel frame and the second steel frame are provided with a mesh hanging structure, which is used to install the first flexible mesh and the second flexible mesh.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The fish harvesting system for aquaculture cabins provided by this utility model uses a segmented structure of the first and second adjustable beams and a telescopic device to enable the second steel frame to adapt to the surface structure of the aquaculture cabin in real time when rotating. This effectively solves the problem of fitting caused by irregular cabin walls, prevents fish from escaping from the gap between the net and the cabin wall, and greatly improves the efficiency of driving fish and the success rate of harvesting.

[0021] 2. The fish harvesting system for the aquaculture vessel provided by this utility model adopts a closed-loop control system with a hydraulic telescopic device and a pressure sensor. It can accurately adjust the telescopic amount of the adjustable beam. Combined with a waterproof structure design, it ensures long-term stable operation in the seawater environment, realizes efficient mechanized harvesting of adult fish in the aquaculture vessel, significantly reduces manual intervention, and reduces labor intensity and fish stress damage. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic front view of an embodiment of the fish harvesting system for aquaculture vessels of this utility model;

[0024] Figure 2 This is a schematic diagram of the second steel frame structure of an embodiment of the fish harvesting system for aquaculture vessels of this utility model;

[0025] Figure 3 This is a schematic left view of an embodiment of the fish harvesting system for aquaculture vessels of this utility model;

[0026] Figure 4 This is a schematic top view of an embodiment of the fish harvesting system for aquaculture vessels of this utility model;

[0027] Figure 5 This is a block diagram illustrating the control principle of an embodiment of the fish harvesting system for the aquaculture vessel of this utility model.

[0028] In the picture:

[0029] 1. First net; 11. First steel frame structure; 12. First flexible net; 121. Net bag; 2. Second net; 21. Second steel frame structure; 211. Rotating beam; 212. First crossbeam; 213. First adjustable beam; 214. Second adjustable beam; 215. Second crossbeam; 22. Second flexible net; 3. Rotating shaft; 4. First telescopic device; 41. First pressure sensor; 5. Second telescopic device; 51. Second pressure sensor; 6. Motor; 61. Gear mechanism; 7. Fish suction pump; 71. Fish suction pipe; 8. Aquaculture tank; 9. External control system; 10. Underwater hydraulic pump station. Detailed Implementation

[0030] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] See appendix Figures 1 to 5 This paper presents an illustrative embodiment of the fish harvesting system for the aquaculture tank of the aquaculture vessel proposed in this utility model. The fish harvesting system for the aquaculture tank includes a first net 1, a second net 2, and a rotating shaft 3.

[0034] A rotating shaft 3 is fixed inside the aquaculture tank 8. A first net 1 is positioned at the maximum width of the aquaculture tank 8. The first net 1 includes a first steel frame 11 and a first flexible net 12 detachably connected to the first steel frame 11. The first steel frame 11 is fixedly connected to the rotating shaft 3. A second net 2 includes a second steel frame 21 and a second flexible net 22 detachably connected to the second steel frame 21. The second steel frame 21 is rotatably connected to the rotating shaft 3. The size of the second flexible net 22 is adapted to the maximum width of the aquaculture tank 8, ensuring that when the second net 2 rotates to the position of the first net 1, the second flexible net 22 is precisely tensioned. This allows for precise capture of adult fish. By utilizing the synergy of the first net 1 and the second net 2, an orderly capture space is created, making the concentration and transfer of adult fish more efficient.

[0035] The second steel frame 21 includes a hinged first adjustable beam 213 and a second adjustable beam 214. Both the first adjustable beam 213 and the second adjustable beam 214 are segmented structures, each including a fixed section and a telescopic section, with a waterproof structure between the fixed section and the telescopic section. The first adjustable beam 213 is equipped with a first telescopic device 4, which is used to extend and retract the first adjustable beam 213 according to the inner surface structure of the breeding chamber 8. The second adjustable beam 214 is equipped with a second telescopic device 5, which is used to extend and retract the second adjustable beam 214 according to the inner surface structure of the breeding chamber 8, so that the second steel frame 21 adaptively fits the inner surface of the breeding chamber 8 in real time when rotating around the rotation axis 3.

[0036] The segmented, adjustable beam design with telescopic mechanism, combined with a waterproof structure, allows the second net 2 to dynamically adapt to the irregular inner surface of the aquaculture tank 8, maintaining a tight fit throughout rotation. This prevents adult fish from escaping through gaps between the net and the tank walls, ensuring continuous and complete harvesting operations and improving harvesting efficiency. Simultaneously, the waterproof structure effectively prevents seawater from entering the beam structure of the aquaculture tank 8, protecting critical components such as the telescopic mechanism, extending equipment lifespan, and adapting to the harsh, high-salt environment of marine aquaculture.

[0037] The second steel frame 21 also includes a first crossbeam 212, a second crossbeam 215, and a rotating beam 211. The rotating beam 211, the first crossbeam 212, the first adjustable beam 213, the second adjustable beam 214, and the second crossbeam 215 are connected end to end in sequence to form a closed frame structure. The rotating beam 211 is sleeved on the rotating shaft 3, and the second adjustable beam 214 is hinged to the second crossbeam 215.

[0038] In this embodiment, the fish harvesting system for the aquaculture vessel's culture tank also includes a motor 6. The motor 6 is located outside the culture tank 8, at the bottom of the culture tank 8. The output shaft of the motor 6 is connected to a rotating beam 211 extending through the bottom of the culture tank 8 via a gear mechanism 61. In practical applications, the rotational speed of the rotating beam 211 should be reasonably controlled by the motor 6 to avoid causing excessive stress and damage to the adult fish. The gear mechanism 61 can be a planar gear mechanism or a spatial gear mechanism, selected according to the bottom space of the culture tank 8.

[0039] The enclosed frame structure stabilizes the second net 2. The sleeved engagement between the rotating beam 211 and the rotating shaft 3, combined with the drive of the motor 6, enables the second net 2 to rotate stably around the axis, providing a reliable trajectory for driving and gathering adult fish. The hinged design ensures that the frame maintains its structural integrity when the adjustable beam extends and retracts to adapt to the bulkhead, preventing deformation and damage to the net due to irregular bulkheads and ensuring long-term stable operation of the harvesting operation. Furthermore, the motor 6 is located at the bottom outside the bulkhead, avoiding interference from seawater and fish activity within the aquaculture tank 8, reducing the risk of malfunction, and facilitating routine maintenance. Simultaneously, the gear mechanism 61 transmits power, driving the rotating beam 211 to rotate the second net 2 stably, achieving mechanized driving of adult fish.

[0040] A sealing device is installed at the position where the rotating beam 211 passes through the bottom of the aquaculture tank 8 to prevent water leakage from the aquaculture tank 8. The sealing device strictly prevents seawater from seeping into the tank, protects the motor 6 and the tank structure outside the tank, maintains the normal water environment of the aquaculture tank 8, and avoids affecting the aquaculture and harvesting process due to water leakage.

[0041] Both the first telescopic device 4 and the second telescopic device 5 are hydraulic telescopic devices, each of which includes a fixed end and a telescopic end. The fixed end of the first telescopic device 4 is fixedly connected to the inner wall of the fixed section of the first adjustable beam 213, and the telescopic end of the first telescopic device 4 is fixedly connected to the inner wall of the telescopic section of the first adjustable beam 213. The fixed end of the second telescopic device 5 is fixedly connected to the inner wall of the fixed section of the second adjustable beam 214, and the telescopic end of the second telescopic device 5 is fixedly connected to the inner wall of the telescopic section of the second adjustable beam 214.

[0042] The fish harvesting system for the aquaculture vessel's aquaculture hold also includes an underwater hydraulic pump station 10, a first pressure sensor 41, and a second pressure sensor 51. The first pressure sensor 41 is located on the outer end face of the telescopic section of the first adjustable beam 213 to monitor the contact pressure between the telescopic section of the first adjustable beam 213 and the inner surface of the aquaculture hold 8 in real time and feed it back to the underwater hydraulic pump station 10. The underwater hydraulic pump station 10 adjusts the telescopic end extension amount of the first telescopic device 4 according to the pressure feedback. The second pressure sensor 51 is located on the outer end face of the telescopic section of the second adjustable beam 214 to monitor the contact pressure between the telescopic section of the second adjustable beam 214 and the inner surface of the aquaculture hold 8 in real time and feed it back to the underwater hydraulic pump station 10. The underwater hydraulic pump station 10 adjusts the telescopic end extension amount of the second telescopic device 5 according to the pressure feedback.

[0043] The hydraulic telescopic device offers stable output force and high adjustment precision, adapting to the complex stress scenarios within the aquaculture tank 8. The underwater hydraulic pump station 10 and pressure sensors form a closed-loop control system, real-time sensing of the contact pressure between the adjustable beam and the tank wall, automatically and precisely adjusting the telescopic amount to ensure the second net 2 always maintains a suitable pressure against the tank wall. This avoids damage to the tank wall and net from excessive pressure, while also preventing gaps due to insufficient pressure, ensuring efficient and safe harvesting operations and achieving intelligent adaptive control.

[0044] In this embodiment, the outer end faces of the telescopic sections of the first adjustable beam 213 and the second adjustable beam 214 are both covered with an elastic wear-resistant layer. This layer can be made of polyurethane and has a thickness of 5-10 mm. The sensing surfaces of the first pressure sensor 41 and the second pressure sensor 51 are flush with the outer surface of the elastic wear-resistant layer. The polyurethane elastic wear-resistant layer possesses high elasticity and wear resistance, buffering the impact force when the adjustable beam is in contact with the bulkhead, protecting the bulkhead coating and mesh structure, and reducing component wear caused by long-term friction, thus extending equipment lifespan. The flush alignment of the sensing surfaces of the first pressure sensor 41 and the second pressure sensor 51 with the wear-resistant layer prevents the wear-resistant layer from affecting pressure transmission, ensuring accurate pressure detection and providing reliable data for the closed-loop control of the first telescopic device 4 and the second telescopic device 5, guaranteeing the accuracy and stability of adaptive bonding.

[0045] In this embodiment, the waterproof structure between the fixed section and the telescopic section of the first adjustable beam 213 and the second adjustable beam 214 is a nested waterproof structure. The nested waterproof structure includes an outer cylinder fixed to the end of the fixed section and an inner cylinder fixed to the beginning of the telescopic section. The inner wall of the outer cylinder has an annular groove, and the outer wall of the inner cylinder has a protrusion that mates with the annular groove, with a fluororubber sealing ring embedded in the protrusion. A metal bellows is provided at the nesting gap between the outer and inner cylinders, with both ends of the metal bellows sealingly connected to the outer and inner cylinders respectively. Furthermore, the outer shells of the two hydraulic telescopic devices are made of stainless steel and coated with a polytetrafluoroethylene anti-corrosion coating. The nested waterproof structure creates multiple static seals. The metal bellows adapts to the telescopic deformation of the adjustable beams, achieving dynamic sealing, significantly improving waterproof reliability and preventing seawater intrusion that could damage internal components. The special material and coating of the outer shell combine high strength and corrosion resistance, resisting marine environmental corrosion, reducing equipment maintenance frequency and costs, and ensuring long-term stable operation.

[0046] The first flexible net 12 is equipped with a net bag 121. The extension direction of the net bag 121 is consistent with the water flow direction in the aquaculture tank 8. The water flow helps the adult fish gather towards the net bag 121, reducing the resistance of the net's active driving force and improving the collection efficiency of the adult fish. A float is provided on the net bag 121 to position it above the first flexible net 12. Furthermore, in this embodiment, the adult fish harvesting system in the aquaculture tank of the aquaculture vessel also includes a fish suction pump 7. The fish suction pump 7 has a fish suction pipe 71, the end of which is connected to the net bag 121. The fish suction pump 7 quickly extracts adult fish from the net bag 121 through the fish suction pipe 71. The type of fish suction pump 7 is not limited; a vacuum fish suction pump, a centrifugal fish suction pump, a jet fish suction pump, and other types of fish suction pumps can be selected.

[0047] The use of a float to suspend the net bag 121 at the top aligns with the swimming habits of adult fish (most fish tend to move in the middle and upper layers), facilitating the concentration of adult fish and optimizing the harvesting operation. Furthermore, the net bag 121 at the top shortens the length of the suction pipe 71. Since head loss along the pipe is positively correlated with pipe length, this reduces frictional resistance. Fewer bends and joints further reduce local resistance, resulting in less hydraulic loss, lower energy consumption, and higher efficiency for the suction pump. This contributes to the efficient operation of the harvesting system, reducing costs and increasing efficiency.

[0048] Both the first steel frame 11 and the second steel frame 21 are equipped with net hanging structures for installing the first flexible net 12 and the second flexible net 22. The net hanging structures allow for detachable connection between the flexible nets and the steel frame, facilitating the installation and removal of the nets and reducing operational difficulty. Simultaneously, they ensure the stability of the net installation, preventing adult fish from escaping due to net detachment or displacement during harvesting, thus ensuring the continuous and effective operation of the harvesting system.

[0049] See appendix Figure 5In this embodiment, the fish harvesting system in the aquaculture vessel's aquaculture hold also includes an external control system 9. The external control system 9 is electrically connected to the motor 6, the fish suction pump 7, and the underwater hydraulic pump station 10. The first pressure sensor 41 detects the pressure between the first adjustable beam 213 and the bulkhead, and transmits the signal to the underwater hydraulic pump station 10, driving the first telescopic device 4 to adaptively extend and retract; similarly, the second pressure sensor 51 and the second telescopic device 5 are controlled independently in a closed-loop manner. The external control system 9 receives pressure feedback from the underwater hydraulic pump station 10, sends a speed command to the motor 6 that matches the fish-driving rhythm, and adjusts the start / stop command to the fish suction pump 7 according to the state of the fish swarm within the net 121, linking the "fish-driving-fish-fish-harvesting" process to achieve intelligent collaboration throughout the entire process.

[0050] In the above illustrative embodiments, the fish harvesting system of the aquaculture vessel's aquaculture cabin uses a segmented structure of the first and second adjustable beams and a telescopic device to enable the second steel frame to adapt to the surface structure of the aquaculture cabin in real time when rotating. This effectively solves the fitting problem caused by irregular cabin walls, prevents fish from escaping from the gap between the net and the cabin walls, and greatly improves the efficiency of driving fish and the success rate of harvesting.

[0051] The following is in conjunction with the appendix Figures 1 to 5 The working process of one embodiment of the fish harvesting system for the aquaculture vessel of this utility model is described below:

[0052] Pre-capture preparation stage: The divers quickly attach the first flexible net 12 and the second flexible net 22 to the corresponding steel structure frames through the hanging net structure on the first steel structure frame 11 and the second steel structure frame 21; start the motor 6, and drive the rotating beam 211 to rotate at a set speed to avoid stress to the fish through the gear mechanism 61. At the same time, the underwater hydraulic pump station 10 is started to detect the initial values ​​of the first pressure sensor 41 and the second pressure sensor 51 (normal contact pressure 5-10 kPa).

[0053] Fish driving stage: Motor 6 drives rotating beam 211 to rotate around rotating shaft 3, causing second steel structure frame 21 to make circular motion. Second flexible net 22 forms a ring barrier with the frame, driving fish towards first net 1. During this process, when first pressure sensor 41 detects pressure < 5 kPa (disconnection), underwater hydraulic pump station 10 drives the extension end of first telescopic device 4 to extend, causing the extension section of first adjustable beam 213 to extend to fit the tank wall until the pressure rises back to 5-10 kPa. When second pressure sensor 51 detects pressure > 10 kPa (overload), underwater hydraulic pump station 10 drives the extension end of second telescopic device 5 to retract, causing the extension section of second adjustable beam 214 to retract until the pressure rises back to 5-10 kPa. When second net 2 rotates to the maximum width of aquaculture tank 8 (position of first net 1), second flexible net 22 is stretched to a taut state to adapt to the tank width, forming a complete enclosure barrier to prevent fish from escaping.

[0054] Fish gathering and suction stage: The driven fish enter the net bag 121 of the first flexible net 12. As the net bag 121 extends with the direction of water flow and floats on the top, the fish are guided by the water flow and blocked by the net and concentrated in the net bag 121. The fish suction pump 7 is started, and the end of the fish suction pipe 71 is inserted into the net bag 121 to extract the adult fish in the net bag 121 to the transport cabin. During the fish suction process, the second net 2 is kept in a rotating and close state to prevent the fish from flowing back.

[0055] Post-harvest reset phase: After the fish suction is completed, the frogman quickly removes the first flexible net 12 and the second flexible net 22 through the hanging net structure. The first steel structure frame 11 and the second steel structure frame 21 are left in the breeding tank 8 to prepare for the next harvest. The rotating beam 211 is reset to the initial position, and the motor 6 stops driving. The hydraulic system is depressurized, and the telescopic sections of the first adjustable beam 213 and the second adjustable beam 214 retract to their initial length. The first pressure sensor 41 and the second pressure sensor 51 return to zero position.

[0056] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A system for harvesting adult fish from the aquaculture tank of an aquaculture vessel, characterized in that, include: A rotating shaft, which is fixed inside the aquaculture chamber; The first net is located at the maximum width of the aquaculture chamber. The first net includes a first steel frame and a first flexible net that is detachably connected to the first steel frame. The first steel frame is fixedly connected to the rotating shaft. The second net includes a second steel frame and a second flexible net detachably connected to the second steel frame, wherein the second steel frame is rotatably connected to the rotating shaft. The second steel structure frame includes a hinged first adjustable beam and a second adjustable beam. Both the first and second adjustable beams are segmented structures, each including a fixed section and a telescopic section. A waterproof structure is provided between the fixed section and the telescopic section. The first adjustable beam is equipped with a first telescopic device, which is used to extend and retract the first adjustable beam according to the surface structure inside the aquaculture chamber. The second adjustable beam is equipped with a second telescopic device, which is used to extend and retract the second adjustable beam according to the surface structure inside the aquaculture chamber, so that the second steel structure frame adaptively fits the surface inside the aquaculture chamber in real time when rotating around the rotation axis.

2. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 1, characterized in that, The second steel structure frame also includes a first crossbeam, a second crossbeam, and a rotating beam. The rotating beam, the first crossbeam, the first adjustable beam, the second adjustable beam, and the second crossbeam are connected end to end in sequence to form a closed frame structure. The rotating beam is sleeved on the rotating shaft, and the second adjustable beam is hinged to the second crossbeam.

3. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 2, characterized in that, It also includes a motor, which is located outside the breeding compartment at the bottom of the breeding compartment. The output shaft of the motor is connected to the rotating beam that extends out of the bottom of the breeding compartment through a gear mechanism.

4. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 3, characterized in that, The rotating beam is equipped with a sealing device at the point where it passes through the bottom of the aquaculture chamber to prevent water from leaking out of the chamber.

5. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 1, characterized in that, Both the first telescopic device and the second telescopic device are hydraulic telescopic devices, and each hydraulic telescopic device includes a fixed end and a telescopic end; the fixed end of the first telescopic device is fixedly connected to the inner wall of the fixed section of the first adjustable beam, and the telescopic end of the first telescopic device is fixedly connected to the inner wall of the telescopic section of the first adjustable beam; the fixed end of the second telescopic device is fixedly connected to the inner wall of the fixed section of the second adjustable beam, and the telescopic end of the second telescopic device is fixedly connected to the inner wall of the telescopic section of the second adjustable beam.

6. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 5, characterized in that, It also includes an underwater hydraulic pump station, a first pressure sensor, and a second pressure sensor; the first pressure sensor is located on the outer end face of the telescopic section of the first adjustable beam to monitor the contact pressure between the telescopic section of the first adjustable beam and the inner surface of the aquaculture tank in real time and feed it back to the underwater hydraulic pump station, which adjusts the telescopic end extension amount of the first telescopic device according to the pressure feedback; the second pressure sensor is located on the outer end face of the telescopic section of the second adjustable beam to monitor the contact pressure between the telescopic section of the second adjustable beam and the inner surface of the aquaculture tank in real time and feed it back to the underwater hydraulic pump station, which adjusts the telescopic end extension amount of the second telescopic device according to the pressure feedback.

7. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 1, characterized in that, The first flexible net is equipped with a net bag, and the extension direction of the net bag is consistent with the water flow direction in the aquaculture tank.

8. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 7, characterized in that, The net bag is equipped with a float so that the net bag is located above the first flexible net.

9. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to claim 8, characterized in that, It also includes a fish suction pump, which has a fish suction tube, the end of which is connected to the net bag.

10. The system for harvesting adult fish from the aquaculture tank of an aquaculture vessel according to any one of claims 1-9, characterized in that, Both the first and second steel structure frames are equipped with a mesh hanging structure, which is used to install the first and second flexible meshes.

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