A holding frame and an ovipositing device for yellow catfish and a method of use

Abstract

The application discloses a retaining frame for yellow catfish and an ovipositing device and a use method thereof. The ovipositing device comprises a shell, and the retaining frame comprises a supporting plate. The outer wall of the supporting plate is fixedly connected with hollow plates at equal intervals, and the number of the hollow plates is two. The hollow plates are slidably connected with arc-shaped elastic sheets, and the number of the arc-shaped elastic sheets is two. The outer wall of the hollow plate is a slope, and the bottom inner wall of the hollow plate is fixedly connected with No. 3 springs. The No. 3 springs are fixedly connected with the bottom of the arc-shaped elastic sheet, and the number of the No. 3 springs is four. The sliding door is controlled to be closed. After the yellow catfish touches the arc-shaped elastic sheet, the pectoral fin spines of the brood fish are opened and locked, so that the fish is conveniently fixed. The motor is started, the ovipositing work of the fish is automatically realized, and the fish eggs are conveniently collected.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, and in particular to a restraint frame and egg-extrusion device for yellow catfish, as well as a method of using them. Background Technology

[0002] Yellow catfish ( Pelteobagrus fulvidraco As an important freshwater economic fish in my country, the yellow catfish is widely favored by the market due to its tender flesh and rich nutrition. In recent years, with the decline of wild resources and the surge in consumer demand, large-scale artificial breeding of yellow catfish has become the core direction of industry development. According to the "China Fisheries Statistical Yearbook," the annual output of yellow catfish has maintained positive growth for many consecutive years. In 2023, the national output of yellow catfish exceeded 600,000 tons, indicating a huge demand for seedlings. However, significant technical bottlenecks still exist in its artificial breeding process, restricting the efficiency of seedling production and the optimization of germplasm resources.

[0003] In current technology, the reproduction of yellow catfish generally relies on artificial egg extraction and fertilization. Due to the species' biological characteristics—sharp, venomous pectoral fin spines, abundant body mucus, and violent struggle—operators face two major technical challenges when manually restraining broodstock: First, the pectoral fin spines easily pierce the operator's hands during restraint, causing local swelling and even nerve paralysis—a professional injury. Simultaneously, the vigorous struggle of the broodstock causes significant shedding of body mucus, damaging the body barrier and leading to secondary infections. Second, artificial egg extraction requires simultaneous pressure on both ovaries in the posterior abdominal cavity of the female fish; however, due to the lack of precise positioning aids, uneven pressure, broken eggs, or high egg retention rates often occur. Data shows that the egg damage rate under traditional methods is as high as 25%–30%, and the fertilization rate is more than 15% lower than ideal.

[0004] Current industry attempts at improvement solutions mainly focus on two categories: one is to use anesthetic drugs (such as MS-222) to reduce the activity of broodstock, but drug residues can inhibit embryonic development and even cause death; the other is to modify general fish restraint frames, such as the "Fixing Device for Fish" in application number CN202222378205.6, which is set on a flat surface with grooves, and installs movable and fixed components to restrain the fish body. However, such devices are difficult to adapt to the special wedge-shaped head and protruding pectoral fins of yellow catfish, and forced fixation can aggravate damage to the body surface. As for egg extraction, there is still no dedicated equipment, and it relies solely on the operator's experience and feel, resulting in significant fluctuations in the quality of the same batch of eggs.

[0005] A deeper technical challenge lies in the fact that the yellow catfish ovary has a Y-shaped forked structure, and mature eggs need to be released from the ovarian lobules through a precise, gradual pressure gradient. Traditional thumb pressure methods cannot achieve linear pressure control; excessive force directly damages the egg membrane structure, while insufficient force causes egg retention. Even more serious is the fact that the female's abdomen is vulnerable during the breeding season, and rough handling can cause abdominal hemorrhage, leading to a broodstock mortality rate of 20%–30%. These problems have a magnified effect in large-scale fry production, directly causing a surge in the costs of artificial breeding and adult fish farming.

[0006] Although some studies (such as the "Optimization of Artificial Insemination Technology for Yellow Catfish" published in *Aquatic Science* in 2022) have proposed optimizing the operational procedures, their improvements are still limited to adjusting the concentration of anesthetics and training techniques, failing to address the core pain points at the equipment level. Therefore, there is an urgent need to develop a specialized breeding device that balances operational safety, egg integrity, and equipment versatility to break through the technological ceiling of the industry.

[0007] Based on the above technical background, the key problem that this invention aims to solve can be summarized as: how to achieve safe and injury-free restraint of yellow catfish? It is necessary to design a fixation mechanism that can avoid fin spine damage while minimizing the loss of mucus on the body surface. This mechanism needs to be adapted to the yellow catfish's unusual body shape of wide head and narrow tail, and the pectoral fins must remain open and locked throughout the entire egg-discharging process.

[0008] How to improve the precision and controllability of oocyte extraction? It is necessary to develop an oocyte extraction component that can quantify the applied force and matches the anatomical structure of the ovary to ensure that the oocytes are released with a uniform pressure gradient and avoid oocyte membrane rupture caused by local stress concentration.

[0009] How to integrate the functions of fish fixation and egg collection? The device needs to complete the entire process from fish fixation to egg collection at a single workstation, reduce mechanical damage during the transfer of broodstock, and meet the adaptation requirements of broodstock of different sizes (body length 15-25cm, weight 80-200g).

[0010] These intertwined technical challenges form a technological chain restricting the large-scale artificial breeding of yellow catfish. Existing technologies fail to provide a systematic solution, while isolated functional improvements (such as individual restraint frames or egg-discharging devices) exacerbate operational complexity due to a lack of coordinated design. Therefore, there is an urgent need for innovative equipment that integrates biomechanical principles and electromechanical control technology to fundamentally reconstruct the technological paradigm of yellow catfish artificial breeding. Thus, we propose a restraint frame and egg-discharging device for yellow catfish, along with its usage method, to address the aforementioned problems. Summary of the Invention

[0011] Given the existing technical issues, such as fin spines pricking the operator's hands during restraint, causing local swelling or even nerve paralysis, and the intense struggle of the parent fish causing a large amount of mucus to slough off, damaging the body surface barrier and leading to secondary infections; and the technical problems that often arise from uneven squeezing force, broken eggs, or high residual rates in artificial egg extraction, this invention proposes a restraint frame and egg extraction device for yellow catfish, as well as a method for using them.

[0012] This invention proposes a restraint frame and egg-extrusion device for yellow catfish, comprising an egg-extrusion device and a restraint frame fixedly installed on top of the egg-extrusion device. The egg-extrusion device includes a shell, and the restraint frame includes a support plate. Hollow plates are fixedly connected at equal intervals to the outer wall of the support plate, and the number of hollow plates is two. Two arc-shaped springs are slidably connected inside the hollow plates, and the number of arc-shaped springs is also two. The outer wall of the hollow plates is inclined, and a No. 3 spring is fixedly connected to the bottom inner wall of the hollow plates. The No. 3 springs are fixedly connected to the bottom of the arc-shaped springs, and the number of No. 3 springs is four. A control box is fixedly connected to the top of the shell, and a baffle is fixedly connected to the bottom inner wall of the shell. A motor is fixedly installed on the upper inner wall of the housing on the right side of the baffle. A gear is fixedly connected to one end of the motor's output shaft. A sliding plate is slidably connected to the lower inner wall of the housing, and a collection box is fixedly connected to the top of the sliding plate. A contact plate is fixedly connected to the right side of the sliding plate. A sliding door is slidably connected to the left side of the housing. A push rod is rotatably connected to the front side of the sliding door, and the bottom of the push rod is rotatably connected to the front side of the sliding plate. A rotating column is rotatably connected to the upper inner wall of the housing, and the top of the rotating column passes through the control box and is fixedly connected to the bottom of the support plate. A movable plate is slidably connected to the left inner wall of the control box, and the left side of the movable plate extends outside the control box. A control mechanism is provided inside the housing.

[0013] Preferably, the control mechanism includes a control column, a sliding sleeve, a control ring, a matching plate, a connecting plate, a starting plate, and a rotating lever. The control column is rotatably connected to the top inner wall of the housing. The sliding sleeve is slidably fitted onto the outer wall of the control column. The control ring is rotatably fitted onto the outer wall of the sliding sleeve, and the left side of the control ring passes through a baffle. The matching plate is slidably connected to the left side of the baffle, and the top of the matching plate is fixedly connected to the bottom of the control ring. The connecting plate is rotatably connected to the left side of the matching plate. The starting plate is slidably connected to the bottom inner wall of the housing, and the right side of the starting plate is rotatably connected to the left side of the connecting plate. The rotating lever is fixedly fitted onto the outer wall of the rotating column. The control mechanism facilitates the clamping of fish while automatically performing top-down egg-squeezing processing.

[0014] Preferably, a first spring is fixedly connected to the top of the control ring, and one end of the first spring is fixedly connected to the top inner wall of the outer casing, so that the control ring can be easily pulled back to its original position by the elastic force of the first spring.

[0015] Preferably, the inner wall of the sliding sleeve is provided with teeth, and the sliding sleeve meshes with the outer wall of the gear. When the gear rotates, the gear can control the sliding sleeve to rotate.

[0016] Preferably, the outer wall of the control column and the outer wall of the rotating column are both fixedly fitted with the same transmission belt. When the control column rotates, the rotating column can be controlled to rotate through the transmission belt.

[0017] Preferably, a second spring is fixedly connected to the bottom of the movable plate, and one end of the second spring is fixedly connected to the left inner wall of the control box. A contact wheel is rotatably connected to the right side of the movable plate, and the contact wheel is in active contact with the rotating lever. A universal wheel is rotatably connected to the left side of the movable plate. The elastic force of the second spring facilitates the control of the movable plate to return to its original position, and when the contact wheel contacts the rotating lever, it facilitates the control of the movable plate to move. At the same time, the universal wheel realizes the function of automatic egg squeezing.

[0018] The present invention also proposes a method for egg extraction, comprising the following steps: S1: First, push the sliding door to close it, then push the sliding plate to move using the push rod, and the sliding plate will move the collection box into the outer shell; S2: Then the sliding plate guides the contact plate to contact the starting plate and pushes the starting plate to move. The starting plate controls the mating plate to descend through the connecting plate. At this time, the sliding sleeve meshes with the gear. S3: Start the motor. The motor's output shaft rotates through gear control of the sliding sleeve, and the sliding sleeve guides the transmission belt to rotate through the control column. At this time, the transmission belt synchronously drives the rotating column to rotate. S4: Then the rotating column drives the rotating lever and the support plate to rotate. At the same time, the fish is placed on the arc-shaped spring plate by the pectoral fin spines of the parent fish after the yellow catfish touches it and locks. At this time, the arc-shaped spring plate descends and bends to fix the fish. S5: Finally, the support plate and the rotating lever rotate, the support plate drives the hollow plate to move, and at the same time controls the moving plate to move. At this time, the universal wheel squeezes the abdomen of the fish to complete the egg squeezing work, and the fish eggs fall into the collection box after being squeezed out.

[0019] The beneficial effects of this invention are: 1. Throughout the entire egg-extraction process of the yellow catfish, the pectoral fin spines remain open and locked. The device suspends the parent fish on an arc-shaped spring by utilizing the open and locked pectoral fin spines after the parent fish is touched. At this time, the arc-shaped spring is lowered under pressure, and the bending of the arc-shaped spring is controlled by the inclined surface of the hollow plate to fix the fish. The parent fish's body hangs naturally, and the ovaries are concentrated on the abdomen of the fish due to gravity, with a clear outline that facilitates accurate identification of the ovary location by the egg-extraction device. The device is adapted to the yellow catfish's ectopic body shape with a wide head and narrow tail, avoiding damage to the fin spines and minimizing the loss of mucus from the body surface.

[0020] 2. By utilizing the quantified force intensity of springs and an egg-squeezing component matched to the ovarian anatomy, the system ensures that eggs are released with a uniform pressure gradient, avoiding egg membrane rupture caused by localized stress concentration. The entire process, from fish fixation to egg collection, is completed at a single workstation, reducing mechanical damage during broodstock transfer and meeting the adaptation needs of broodstock of different sizes. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the structure of a restraint frame and egg-extrusion device for yellow catfish proposed in this invention; Figure 2 This is a three-dimensional structural diagram of the hollow plate and arc-shaped spring sheet of a restraint frame for yellow catfish proposed in this invention; Figure 3 This is a bottom view of the structure of the sliding sleeve of the egg-squeezing device proposed in this invention; Figure 4 This is a top view of the rotating lever of an egg-squeezing device proposed in this invention; Figure 5 This is a top view of the moving plate and contact wheel of an egg-squeezing device proposed in this invention.

[0022] In the diagram: 1. Outer shell, 2. Motor, 3. Gear, 4. Baffle, 5. Sliding door, 6. Sliding plate, 7. Collection box, 8. Contact plate, 9. Push rod, 10. Start plate, 11. Connecting plate, 12. Matching plate, 13. Control column, 14. Control ring, 15. Sliding sleeve, 16. Spring No. 1, 17. Transmission belt, 18. Control box, 19. Rotating column, 20. Rotating lever, 21. Moving plate, 22. Caster wheel, 23. Spring No. 2, 24. Contact wheel, 25. Support plate, 26. Hollow plate, 27. Arc-shaped spring, 28. Spring No. 3. Detailed Implementation

[0023] The present invention will be further explained below with reference to specific embodiments.

[0024] refer to Figure 1-5This embodiment proposes a restraint frame and an egg-extrusion device for yellow catfish, including an egg-extrusion device and a restraint frame fixedly installed on top of the egg-extrusion device. The egg-extrusion device includes a shell 1, and the restraint frame includes a support plate 25. Hollow plates 26 are fixedly connected at equal intervals to the outer wall of the support plate 25. The hollow plates 26 restrict the longitudinal movement of the arc-shaped spring pieces 27, and there are two hollow plates 26. Arc-shaped spring pieces 27 are slidably connected inside the hollow plates 26, and there are two arc-shaped spring pieces 27. The outer wall of the hollow plate 26 is inclined. Furthermore, a third spring 28 is fixedly connected to the bottom inner wall of the hollow plate 26. The third spring 28 is fixedly connected to the bottom of the arc-shaped spring piece 27, and there are four third springs 28. The hollow plate 26 guides the arc-shaped spring piece 27 to be fully clamped by the inclined surface, and at the same time, the elastic force of the third spring 28 facilitates the push of the arc-shaped spring piece 27 to return to its original position. A control box 18 is fixedly connected to the top of the outer shell 1, and a baffle 4 is fixedly connected to the bottom inner wall of the outer shell 1. The baffle 4 restricts the longitudinal movement of the mating plate 12, and the top inner wall of the outer shell 1... A motor 2 is fixedly installed on the right side of the baffle 4. A gear 3 is fixedly connected to one end of the output shaft of the motor 2. The gear 3 rotates through the output shaft of the motor 2 and meshes with the sliding sleeve 15, facilitating the rotation of the sliding sleeve 15. A sliding plate 6 is slidably connected to the bottom inner wall of the outer casing 1, and a collection box 7 is fixedly connected to the top of the sliding plate 6. A contact plate 8 is fixedly connected to the right side of the sliding plate 6. A sliding door 5 is slidably connected to the left side of the outer casing 1. The sliding door 5 is controlled by a push rod 9 to move the sliding plate 6 left and right. A push rod 9 is rotatably connected to the front side of the 5, and the bottom of the push rod 9 is rotatably connected to the front side of the sliding plate 6. A rotating column 19 is rotatably connected to the top inner wall of the outer casing 1, and the top of the rotating column 19 passes through the control box 18 and is fixedly connected to the bottom of the support plate 25. The rotating column 19 rotates under the control of the transmission belt 17, which facilitates the control of the rotating lever 20 and the support plate 25 to rotate. A movable plate 21 is slidably connected to the left inner wall of the control box 18, and the left side of the movable plate 21 extends to the outside of the control box 18. A control mechanism is provided inside the outer casing 1. The control mechanism includes a control column 13, a sliding sleeve 15, a control ring 14, a mating plate 12, a connecting plate 11, a starting plate 10, and a rotating lever 20. The control column 13 is rotatably connected to the top inner wall of the housing 1. The sliding sleeve 15 is slidably fitted onto the outer wall of the control column 13. The sliding sleeve 15 moves with the movement of the control ring 14 to facilitate engagement with the gear 3. The control ring 14 is rotatably fitted onto the outer wall of the sliding sleeve 15, and the left side of the control ring 14 passes through the baffle 4. The mating plate 12 is slidably connected to the left side of the baffle 4, and the top of the mating plate 12 is fixedly connected to the bottom of the control ring 14. The connecting plate 11 is rotatably connected to the left side of the mating plate 12. The starting plate 10 is slidably connected to the bottom inner wall of the housing 1. The starting plate 10 contacts the contact plate 8 and controls the mating plate 12 to move via the connecting lever 11. The control mechanism allows for the automatic squeezing of fish eggs while gripping them. A first spring 16 is fixedly connected to the top of the control ring 14, and one end of the first spring 16 is fixedly connected to the top inner wall of the outer casing 1. The elastic force of the first spring 16 allows for easy pulling of the control ring 14 back to its original position. The inner wall of the sliding sleeve 15 is provided with teeth, and the sliding sleeve 15 meshes with the outer wall of the gear 3. When the gear 3 rotates, the gear 3 can control the sliding sleeve 15 to rotate. The outer wall of the control column 13 and the outer wall of the rotating column 19 are both fixedly fitted with the same transmission belt 17. When the control column 13 rotates, the transmission belt 17 can control the rotation of the rotating column 13. A second spring 23 is fixedly connected to the bottom of the movable plate 21, and one end of the second spring 23 is fixedly connected to the left inner wall of the control box 18. A contact wheel 24 is rotatably connected to the right side of the movable plate 21, and the contact wheel 24 is in active contact with the rotating lever 20. A universal wheel 22 is rotatably connected to the left side of the movable plate 21. The elastic force of the second spring 23 facilitates the control of the movable plate 21 to return to its original position. When the contact wheel 24 contacts the rotating lever 20, it facilitates the control of the movement of the movable plate 21. At the same time, the universal wheel 22 realizes the function of automatic egg squeezing.

[0025] In this embodiment, during actual operation, the sliding door 5 is closed by pushing it. At this time, the sliding door 5 moves the sliding plate 6 via the push rod 9. As the sliding plate 6 moves, it moves the collection box 7 into the outer shell 1. Simultaneously, the sliding plate 6 guides the contact plate 8 to contact the starting plate 10 and pushes the starting plate 10 to move. When the starting plate 10 moves, it controls the mating plate 12 to descend via the connecting plate 11. At this time, the mating plate 12 drives the sliding sleeve 15 to descend via the control ring 14 and engage with the gear 3. When the sliding sleeve 15 engages with the gear 3, the motor 2 is started. The output shaft of the motor 2 controls the gear 3 to rotate. When the gear 3 rotates, it controls the sliding sleeve 15 to rotate via its teeth. When the sliding sleeve 15 rotates, it guides the transmission belt 1 via the control column 13. 7 rotates, and as the transmission belt 17 rotates, the transmission belt 17 synchronously drives the rotating column 19 to rotate. When the rotating column 19 rotates, it drives the rotating lever 20 and the support plate 25 to rotate. At the same time, the fish is placed on the arc-shaped spring plate 27 by the pectoral fin spines of the parent fish after being touched and locked. At this time, the arc-shaped spring plate 27 is lowered by pressure. At the same time, the inclined surface of the hollow plate 26 controls the arc-shaped spring plate 27 to bend and fix the fish. At this time, as the support plate 25 and the rotating lever 20 rotate, the support plate 25 drives the hollow plate 26 to move. At the same time, the rotating lever 20 cyclically contacts the contact wheel 19, controlling the moving plate 21 to move. At this time, the moving plate 21 drives the universal wheel 22 to squeeze the abdomen of the fish, completing the egg squeezing work. After the fish eggs are squeezed out, they fall into the collection box 7 for easy collection.

[0026] This invention also proposes a method for egg extraction, comprising the following steps: S1: First, push the sliding door 5 to close it, then push the sliding plate 6 to move via the push rod 9, and the sliding plate 6 will move the collection box 7 into the outer shell 1; S2: Then the sliding plate 6 guides the contact plate 8 to contact the starting plate 10 and pushes the starting plate to move. The starting plate 10 controls the mating plate 12 to descend through the connecting plate 11. At this time, the sliding sleeve 15 meshes with the gear 3. S3: Start motor 2. The output shaft of motor 2 controls the sliding sleeve 15 to rotate through gear 3. The sliding sleeve 15 guides the transmission belt 17 to rotate through control column 13. At this time, the transmission belt 17 synchronously drives the rotating column 19 to rotate. S4: Then, rotating column 19 drives rotating lever 20 and support plate 25 to rotate. At the same time, the fish is placed on arc-shaped spring plate 27 by the pectoral fin spines of the parent fish after being touched by the yellow catfish. At this time, arc-shaped spring plate 27 descends and bends to fix the fish. S5: Finally, the support plate 25 and the rotating lever 20 rotate, the support plate 25 drives the hollow plate 26 to move, and at the same time controls the moving plate 21 to move. At this time, the universal wheel 22 squeezes the abdomen of the fish to complete the egg squeezing work, and the fish eggs fall into the collection box 7 after being squeezed out.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A system for squeezing eggs from yellow catfish, comprising an egg-squeezing device and a restraining frame fixedly installed on top of the egg-squeezing device, wherein the egg-squeezing device comprises a shell (1) and the restraining frame comprises a support plate (25), characterized in that, Hollow plates (26) are fixedly connected at equal intervals to the outer wall of the support plate (25), and there are two hollow plates (26). Arc-shaped spring pieces (27) are slidably connected inside the hollow plates (26), and there are two arc-shaped spring pieces (27). The outer wall of the hollow plates (26) is inclined, and a No. 3 spring (28) is fixedly connected to the bottom inner wall of the hollow plates (26). The No. 3 spring (28) is fixedly connected to the bottom of the arc-shaped spring pieces (27), and there are four No. 3 springs (28). A control box (18) is fixedly connected to the top of the outer shell (1), and a baffle (4) is fixedly connected to the bottom inner wall of the outer shell (1). A motor (2) is fixedly installed on the top inner wall of the outer shell (1) to the right of the baffle (4). (2) A gear (3) is fixedly connected to one end of the output shaft. A sliding plate (6) is slidably connected to the bottom inner wall of the outer casing (1), and a collection box (7) is fixedly connected to the top of the sliding plate (6). A contact plate (8) is fixedly connected to the right side of the sliding plate (6). A sliding door (5) is slidably connected to the left side of the outer casing (1). A push rod (9) is rotatably connected to the front side of the sliding door (5), and the bottom of the push rod (9) is rotatably connected to the front side of the sliding plate (6). A rotating column (19) is rotatably connected to the top inner wall of the outer casing (1), and the top of the rotating column (19) passes through the control box (18) and is fixedly connected to the bottom of the support plate (25). A moving plate (21) is slidably connected to the left inner wall of the control box (18), and the moving plate (21)... The left side extends to the outside of the control box (18). The outer shell (1) is equipped with a control mechanism, which includes a control column (13), a sliding sleeve (15), a control ring (14), a matching plate (12), a connecting plate (11), a start plate (10), and a rotating lever (20). The control column (13) is rotatably connected to the top inner wall of the outer shell (1). The sliding sleeve (15) is slidably fitted on the outer wall of the control column (13). The control ring (14) is rotatably fitted on the outer wall of the sliding sleeve (15), and the left side of the control ring (14) passes through the baffle (4). The matching plate (12) is slidably connected to the left side of the baffle (4), and the top of the matching plate (12) is fixedly connected to the bottom of the control ring (14). The connecting plate (11) rotates. Connected to the left side of the matching plate (12), the starting plate (10) is slidably connected to the bottom inner wall of the outer shell (1), and the right side of the starting plate (10) is rotatably connected to the left side of the connecting plate (11). The rotating lever (20) is fixedly sleeved on the outer wall of the rotating column (19). The top of the control ring (14) is fixedly connected to a first spring (16), and one end of the first spring (16) is fixedly connected to the top inner wall of the outer shell (1). The inner wall of the sliding sleeve (15) is provided with teeth, and the sliding sleeve (15) meshes with the outer wall of the gear (3). The outer wall of the control column (13) and the outer wall of the rotating column (19) are both fixedly sleeved with the same transmission belt (17). The bottom of the moving plate (21) is fixedly connected to a second spring (23).Furthermore, one end of the second spring (23) is fixedly connected to the left inner wall of the control box (18), a contact wheel (24) is rotatably connected to the right side of the moving plate (21), and the contact wheel (24) is in active contact with the rotating lever (20). A caster wheel (22) is rotatably connected to the left side of the moving plate (21).

2. A method for egg extraction, employing the egg extraction system for yellow catfish as described in claim 1, characterized in that, Includes the following steps: S1: First, push the sliding door (5) to close it, push the sliding plate (6) to move by pushing the push rod (9), and the sliding plate (6) drives the collection box (7) to move into the outer shell (1); S2: Then the sliding plate (6) guides the contact plate (8) to contact the starting plate (10) and pushes the starting plate (10) to move. The starting plate (10) controls the matching plate (12) to descend through the connecting plate (11). At this time, the sliding sleeve (15) meshes with the gear (3). S3: Start the motor (2). The output shaft of the motor (2) controls the sliding sleeve (15) to rotate through the gear (3). The sliding sleeve (15) guides the transmission belt (17) to rotate through the control column (13). At this time, the transmission belt (17) synchronously drives the rotating column (19) to rotate. S4: Then the rotating column (19) drives the rotating lever (20) and the support plate (25) to rotate. At the same time, the fish is placed on the arc-shaped spring plate (27) by the pectoral fin spines of the parent fish after the yellow catfish touches it and locks. At this time, the arc-shaped spring plate (27) descends and bends to fix the fish. S5: Finally, the support plate (25) and the rotating lever (20) rotate, the support plate (25) drives the hollow plate (26) to move, and at the same time controls the moving plate (21) to move. At this time, the universal wheel (22) squeezes the abdomen of the fish to complete the egg squeezing work, and the fish eggs fall into the collection box (7) after being squeezed out.

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