An artificial nest for fish farming
By designing a biomimetic artificial nest to simulate the three-dimensional habitat of natural waters, the problems of bottom sediment pollution and water quality deterioration in tilapia farming have been solved, improving breeding efficiency and hatching rate, reducing costs, and making it suitable for large-scale tilapia farming.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FRESHWATER FISHERIES RES CENT OF CHINESE ACAD OF FISHERY SCI
- Filing Date
- 2025-06-16
- Publication Date
- 2026-06-16
Smart Images
Figure CN224356859U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of aquaculture technology, specifically relating to an artificial nest for fish farming. Background Technology
[0002] Tilapia, a distinctive farmed fish species and an important export earner in my country, boasts advantages such as salt and heat tolerance, low farming costs, and delicious meat. Yields can reach 20,000 jin per mu (approximately 10,000 kg per hectare), making it one of the pillar industries of the aquaculture economy in southern my country. Its tolerance to low oxygen levels is stronger than that of most carp species, and it is well-suited to high-temperature water environments, further expanding its farming scope.
[0003] Currently, most tilapia hatcheries use a natural pond breeding model, but this model has the following significant drawbacks:
[0004] Natural reproduction relies on earthen spawning ponds, where the bottom is often covered with silt. Tilapia, however, prefer sandy bottoms for nesting (sand is clean, has a high fertilization rate, and is easy for the female to suck eggs). Male tilapia expend considerable energy pecking at the silt until it hardens, delaying spawning and causing the water to become turbid and lose transparency, severely impacting egg formation and embryonic development. Harmful substances like ammonia and nitrites accumulated in the silt easily contaminate the eggs, and fertilized eggs buried in the silt suffer from oxygen deficiency or contact with harmful microorganisms, resulting in a lower hatching rate. Traditional earthen ponds lack water isolation and circulation mechanisms; the water disturbance caused by fish tail movements and nest building easily creates eddies, trapping metabolic waste, exacerbating dissolved oxygen deficiency, and increasing the risk of egg mortality. While artificial breeding allows for environmental control, the high equipment investment and complex operation make it difficult for small and medium-sized fish farmers to adopt, leaving natural reproduction as the mainstream method. Therefore, a low-cost, ecological improvement solution is urgently needed.
[0005] Currently, there is an urgent need to address the problems existing in the natural reproduction of fish using current technologies, such as bottom sediment pollution, water quality deterioration, poor spawning environment, low reproductive efficiency, and high farming costs. Utility Model Content
[0006] The purpose of this invention is to provide an artificial nest for fish farming, which solves the problems existing in the prior art, significantly improves the reproductive efficiency of tilapia, increases fertilization and hatching rates, and effectively blocks the pollution of pond bottom sludge.
[0007] To achieve the above objectives, this utility model provides the following solution: an artificial nest for fish farming, comprising:
[0008] The recessed surface includes a solid part and a void part disposed above the solid part. The solid part is a closed shell, and the void part has a porous structure and forms a water-permeable layer.
[0009] A housing frame includes a main ring and a toe body rotatably mounted on the main ring. The bottom of the housing surface is connected to the main ring. The toe body has an arc-shaped structure, and the curvature of the toe body matches the curvature of the housing surface. The rotation trajectory of the toe body includes a folded position and an unfolded position for suspending the housing surface above a preset support surface. The toe body located in the folded position is in contact with the outer surface of the housing frame. The toe body located in the unfolded position is supported on the preset support surface, and the main ring and the preset support surface have a support gap.
[0010] In one embodiment, the number of toe bodies is at least three, and any one of the toe bodies is rotatably connected to the main ring.
[0011] In one embodiment, the toe body is rotatably connected to the main ring via a rotating connection assembly. The rotating connection assembly includes a rotating cylinder fixed to the main ring and a curved section disposed at the end of the toe body. The curved section is inserted into the rotating cylinder and rotates with the rotating cylinder. The end of the curved section is provided with a limiting cap to prevent the curved section from coming out of the rotating cylinder.
[0012] As one embodiment, it also includes a rope adjuster, wherein a toe loop is provided on the toe body, and an adjusting rope passes through the toe loop and is connected to the rope adjuster; the rope adjuster includes a locking component for locking the adjusting rope.
[0013] In one embodiment, the rope adjuster further includes a fixed cylinder, which is fixed to the main ring; the locking assembly includes a locking cone and a return spring: the tip of the locking cone is inserted into the fixed cylinder, and the tip of the locking cone forms a clamping area with the inner wall surface of the fixed cylinder for clamping the adjusting rope; one end of the return spring is connected to a crossbar at the end of the fixed cylinder, and the other end of the return spring is connected to the tip of the locking cone.
[0014] As one embodiment, the bottom diameter of the locking cone is larger than the inner diameter of the fixing cylinder, and the bottom surface of the locking cone is provided with an operating handle.
[0015] In one embodiment, the adjusting rope passes through the fixed cylinder, and the adjusting rope includes a rope end protruding from the fixed cylinder.
[0016] As one embodiment, the main ring is provided with a baffle for supporting the toe body. The baffle is located below the rotating cylinder and is located on the rotation path of the toe body.
[0017] As one embodiment, the top of the concave surface is provided with a circular opening, the diameter of which is between 35-45cm.
[0018] As one embodiment, the vertical distance from the circular opening to the bottom of the indentation is between 12 and 18 cm.
[0019] The utility model achieves the following technical effects compared to the prior art:
[0020] 1. This utility model achieves precise creation of a natural spawning environment through biomimetic structural design and functional zoning. The spawning surface adopts a spherical shell structure with a "hollow upper layer and solid lower layer" to simulate the three-dimensional habitat of "permeable upper layer + substrate lower layer" in natural waters, realizing a three-dimensional biomimetic design that conforms to the spawning habits of fish (such as tilapia) in shallow water. The rotating support of the toe-like structure allows the spawning surface to be suspended above the pond bottom (the support spacing is adjustable), avoiding the mud and sludge interference faced by traditional bottom spawning, while also satisfying the fish's preference for spawning in higher areas. The sealed shell structure of the solid part forms a rigid isolation layer, blocking the migration of harmful substances such as mud, ammonia nitrogen, and nitrite from the pond bottom to the spawning area, providing a clean attachment environment for the fish eggs. The porous structure of the hollow part achieves the dual functions of water permeability and fish egg retention. The pore size of the permeable holes in the hollow part is smaller than the fish egg particle size, ensuring that the fish eggs cannot leak out; the permeable layer allows free water exchange, increasing the dissolved oxygen content in the spawning area and avoiding the adverse effects of a hypoxic environment at the bottom of the pond on fish egg development. The distributed layout of the permeable holes in the hollow body can quickly drain the water generated by the fish's tail wagging, reduce eddies and resistance in the pool, reduce the energy consumption of the fish swimming, and prevent the retention of metabolic waste.
[0021] Environmental adaptability of adjustable support structure:
[0022] The curved structure of the toe body precisely matches the curvature of the nest surface. Through a dual-state switching between folded and unfolded positions, the unfolded toe body abuts the pond bottom, raising the nest surface to the target height, adapting to different water depths or bottom sediment conditions, achieving height-adjustable support, and meeting the needs of multiple scenarios. The folded toe body fits snugly against the outer surface of the nest surface for storage, reducing volume for easy transportation, cleaning, or dense deployment, significantly improving aquaculture management efficiency. The artificial nest's precise adaptation to the biological characteristics of fish (such as spawning site preferences and optimized swimming resistance) enhances its actual effectiveness in aquaculture production, providing a highly efficient and ecological new tool for large-scale fish farming. It significantly improves tilapia reproductive efficiency, increases fertilization and hatching rates, contributes to pond water quality improvement, and reduces disease occurrence. It is not limited by pond bottom mud and can also be used in cement ponds. Simple to construct and easy to operate, it is suitable for the reproductive needs of a wide range of tilapia.
[0023] Other technical solutions of this utility model also achieve the following technical effects:
[0024] 2. The diameter of the locking cone's bottom surface is larger than the inner diameter of the fixed cylinder. The return spring continuously provides pulling force under normal conditions, ensuring the locking cone and fixed cylinder remain in contact at all times, maintaining the locked state without the need for an additional power source. By controlling the tension of the adjusting rope, the toe can be locked arbitrarily within its rotation range, achieving stepless angle adjustment. This allows for different support heights on the fishpond surface, adapting to pond bottoms of varying depths. It offers excellent ease of adjustment and environmental adaptability, improving aquaculture management efficiency and making it suitable for large-scale fish farming. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;
[0027] Figure 2 This is a schematic diagram of the concave surface structure of this utility model;
[0028] Figure 3 This is a schematic diagram of the three-toed support structure of this utility model;
[0029] Figure 4 This is a schematic diagram of the concave support frame structure of this utility model;
[0030] Figure 5 This is a schematic diagram of the toe connection structure of this utility model;
[0031] Figure 6 This is a schematic diagram of the rope fastener structure of this utility model;
[0032] Figure 7 This is a schematic diagram of the overall structure of this utility model in its unfolded state;
[0033] Figure 8 This is a schematic diagram of the three-toe bracket structure of this utility model from another perspective.
[0034] 1. Concave surface; 2. Solid part; 3. Loose part; 4. Main ring; 5. Toe body; 6. Rotating cylinder; 7. Bending section; 8. Limiting cap; 9. Rope adjuster; 10. Adjusting rope; 11. Fixing cylinder; 12. Locking cone; 13. Return spring; 14. Baffle; 15. Rope end; 16. Toe ring; 17. First toe body; 18. Second toe body; 19. Third toe body; 20. Concave surface support frame. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0037] This utility model provides an artificial nest for fish farming, see reference. Figure 1-8 As shown, the device includes a spawning surface 1 and a spawning frame. The spawning surface 1 is a spherical shell structure with an opening at the top for fish to swim in and out. The spawning surface 1 includes a solid part 2 and a hollow part 3. The spawning surface 1 can be divided into an upper hollow part 3 and a lower solid part 2. The hollow part 3 is located above the solid part 2. The solid part 2 is a closed shell, forming a closed spawning base on the solid part 2. Its surface is flat and can imitate a natural riverbed. The hollow part 3 has a porous structure, forming a permeable layer. Preferably, the hollow part 3 is made of a dense mesh or multi-microporous material, and the solid part 2 is made of a sandy yellow or off-white material forming an impermeable area. Preferably, the pore size of the hollow part 3 is smaller than the size of the fish eggs to prevent the fish eggs from leaking out of the permeable layer. The housing frame includes a main ring 4, which is an annular structure. At least three toe bodies 5 are rotatably connected to the main ring 4, and each toe body 5 is rotatably connected to the main ring 4. The toe bodies 5 are evenly distributed along the circumference of the main ring 4. The bottom of the housing surface 1 is connected to the main ring 4. Preferably, the housing surface 1 is fixedly connected to the main ring 4, which can be achieved by welding or bolting. The toe bodies 5 have an arc-shaped structure, and the curvature of the toe bodies 5 matches the curvature of the outer surface of the housing surface 1, allowing the toe bodies 5 to conform to the outer surface of the housing surface 1. The toe body 5 can rotate on the main ring 4. The rotation trajectory of the toe body 5 includes a folded position and an unfolded position. When the toe body 5 is in the folded position, it can fit against the outer surface of the recess 1. When the toe body 5 is in the unfolded position, it is used to suspend the recess 1 above the preset support surface (pool bottom). When the toe body 5 is in the unfolded position, it can abut against the preset support surface. At this time, the toe body 5 can support the main ring 4 and form a support gap between the main ring 4 and the preset support surface. The preset support surface can be the pool body. When there are three toe bodies 5, the three toe bodies 5 are arranged in a triangular shape to form a triangular support structure. The three toe bodies 5 are evenly distributed around the circumference of the main ring 4, and adjacent toe bodies 5 can be spaced 120° apart. When the three toe bodies 5 are supported on the pool bottom, a stable triangular support structure is formed to ensure the stability of the structure.
[0038] Working principle: Artificial nest working method
[0039] The artificial fish nest provided by this utility model achieves the creation of a spawning environment and the adjustment of water body adaptability through the synergistic effect of the functional zoning of the nest surface 1 and the rotatable support structure of the toe frame. The specific working process is as follows: The artificial nest is transported to the target area of the breeding pond, and the arc-shaped toe body 5 is manually rotated from the folded position (fitting the outer surface of the nest surface 1) to the unfolded position. At this time, the end of the toe body 5 abuts against the preset support surface (such as the bottom of the pond), and the bottom of the nest surface 1 is supported by the annular main ring 4, forming a support gap between the main ring 4 and the bottom of the pond, so that the nest surface 1 is suspended above the bottom of the pond. The height of the nest surface 1 is determined by the rotation angle of the toe body. The nest surface 1 and the main ring 4 are fixedly connected by welding or bolts to ensure stable mechanical transmission when the toe body 5 is unfolded, and to avoid the nest surface 1 shaking or tilting due to water flow impact.
[0040] The solid part 2, acting as a sealed shell, uses a sandy yellow or off-white impermeable material and a smooth surface to mimic the color and texture of a natural riverbed. This attracts fish (such as tilapia) to swim into the opening at the top of the nest surface 1 and gather on the surface of the solid part 2 to spawn. After the fish eggs attach, the airtightness of the solid part 2 effectively isolates the mud and sludge from the bottom of the pond, preventing pollution. The hollow part 3, located above the solid part 2, uses a porous structure made of a dense mesh or multi-microporous material to form a permeable layer. The pore size can be smaller than the size of the fish eggs, preventing the fish eggs from leaking out while allowing external water to flow into the nest surface 1 through the permeable holes, achieving water exchange and maintaining the freshness of the water quality inside the nest. In addition, the water flow generated by the fish's tail movements can be quickly discharged through the permeable holes of the hollow part 3, reducing water flow resistance inside the nest, making the fish swim more smoothly and reducing the energy consumption of tail movements.
[0041] When the artificial nest needs to be moved or stored, rotate the toe body 5 to fit against the outer surface of the nest surface 1 until it is folded, reducing the overall volume and making it easier to lift or transport from the water. To re-deploy, simply repeat the unfolding operation to restore the supported state. The curvature of the toe body 5 matches the curvature of the nest surface 1, and rotating the toe body 5 allows for height adjustment of the nest surface 1, adapting to different water depths and conforming to the spawning habits of fish.
[0042] In this invention, the ecological adaptability and practical performance of artificial nests for fish farming are significantly improved through biomimetic structural design and functional zoning. Specific advantages are as follows:
[0043] It achieves precise creation of a natural spawning environment:
[0044] The spawning surface 1 adopts a spherical shell structure with a "hollow upper layer and solid lower layer" to simulate the three-dimensional habitat of "permeable upper layer + substrate lower layer" in natural waters, achieving a three-dimensional biomimetic design that conforms to the spawning habits of fish (such as tilapia) in shallow water areas. The solid part 2 uses a sandy yellow / off-white impermeable material (imitating riverbed color) and a smooth surface roughness to accurately reproduce the visual and tactile characteristics of a natural riverbed, significantly enhancing the fish's willingness to spawn. Through the rotating support of the toe body 5, the spawning surface 1 is suspended 5-10cm above the pond bottom (the support spacing is adjustable), avoiding the mud and dirt interference faced by traditional pond bottom spawning, while also satisfying the fish's preference for spawning in "higher, shallower water areas".
[0045] A multi-layered balance between fish egg safety and water permeability to prevent leakage: The sealed shell structure of the solid part 2 forms a rigid isolation layer, blocking the migration of harmful substances such as mud, ammonia nitrogen, and nitrite from the bottom of the pond to the spawning area, providing a clean environment for fish eggs to attach. The porous structure (dense mesh / microporous material) of the hollow part 3 achieves the dual functions of water permeability and fish egg retention. The pores on the hollow part 3 are smaller than the size of the fish eggs, ensuring that the fish eggs cannot leak out; the permeable layer allows free water exchange, increasing the dissolved oxygen content in the nest and avoiding the adverse effects of the hypoxic environment at the bottom of the pond on fish egg development. The distributed layout of the permeable pores in the hollow part 3 can quickly discharge the water flow generated by the fish's tail movements, reducing eddies and resistance in the nest, reducing the energy consumption of fish swimming, and preventing the retention of metabolic waste.
[0046] Environmental adaptability of adjustable support structure:
[0047] The arc-shaped structure of the toe body 5 precisely matches the curvature of the nest surface 1. Through dual-state switching between folded and unfolded positions, the unfolded toe body 5 abuts against the bottom of the pool, raising the nest surface 1 to the target height, adapting to different water depths or geological conditions, achieving height-adjustable support, and meeting the needs of multiple scenarios. The folded toe body 5 fits snugly against the outer surface of the nest surface 1 for storage, reducing its volume for easy transportation, cleaning, or dense deployment, significantly improving aquaculture management efficiency. The artificial nest can be precisely adapted to the biological characteristics of fish (such as spawning site preferences and optimized swimming resistance), improving actual efficiency in aquaculture production and providing a new, efficient, and ecological tool for large-scale fish farming.
[0048] In one embodiment, the toe body 5 is connected to the main ring 4 via a rotating connection assembly, which includes a rotating cylinder 6 fixed to the upper surface of the main ring 4. Preferably, the rotating cylinder 6 is vertically fixed to the main ring 4 and has a cylindrical structure. A curved section 7 is disposed at the end of the toe body 5, and the curved section 7 is bent at approximately 90° to the toe body 5. Preferably, the curved section 7 is bent at 90°±10° to the main body of the toe body 5. The curved section 7 is rotatably engaged with the rotating cylinder 6. The curved section 7 is inserted into the rotating cylinder 6, and the insertion length of the curved section 7 is less than the length of the rotating cylinder 6, ensuring that the toe body 5 can rotate freely around the axis of the rotating cylinder 6. A limiting cap 8 is larger than the inner diameter of the rotating cylinder 6 and is fixedly connected to the end of the curved section 7. The limiting cap 8 can prevent the curved section 7 from coming out of the rotating cylinder 6. Preferably, the clearance fit surfaces of the curved section 7 and the rotating cylinder 6 are smoothed, or an annular lubrication groove is opened on the inner wall of the rotating cylinder 6 and filled with silicone-based grease to reduce the rotational resistance of the curved section 7 and ensure that the toe body 5 can smoothly switch between the folded position and the unfolded position.
[0049] In one embodiment, a rope adjuster 9 is also included. The rope adjuster 9 is disposed on the bottom surface of the main ring 4, and the rotation state of the toe body 5 is locked and adjusted by the rope adjuster 9. A toe ring 16 is provided on the toe body 5. The toe ring 16 is a circular structure and is located near the lower end of the toe body 5, that is, near the base of the main ring 4. The adjusting rope 10 is threaded through the toe ring 16 on the toe body 5 and is fixedly connected to the toe body 5. The adjusting rope 10 is also connected to the rope adjuster 9. A locking component is provided on the rope adjuster 9, which can lock the adjusting rope 10. The rope adjuster 9 includes a fixed cylinder 11. The fixed cylinder 11 is a cylindrical structure and is fixed to the main ring 4 by welding or bolts. The locking assembly includes a locking cone 12 and a return spring 13. The locking cone 12 is a conical component with a base diameter larger than the inner diameter of the fixed cylinder 11, forming a wedge-shaped mating surface. This ensures that only the tip of the locking cone 12 is inserted into the fixed cylinder 11, and the tip can occupy 1 / 3 to 1 / 2 of the total length of the locking cone 12. The tip of the locking cone 12 is inserted into the fixed cylinder 11. A crossbar is provided at the end of the fixed cylinder 11, and the crossbar is fixedly connected to one end of the return spring 13. The other end of the return spring 13 is fixedly connected to the tip of the locking cone 12. The adjusting rope 10 can be clamped between the locking cone 12 and the fixed cylinder 11. Under normal conditions, the return spring 13 pulls the locking cone 12 into the fixed cylinder 11 through its elastic force, causing the conical surface of the locking cone 12 to fit against the cylinder wall, thus clamping the adjusting rope 10.
[0050] An operating handle is provided on the bottom surface of the locking cone 12, which allows personnel to easily lift the locking cone 12 to adjust the locking and unlocking states of the rope adjuster 9.
[0051] In one embodiment, after the adjusting rope 10 passes through the through hole of the rotating drum 6, it extends to the other side to form a rope head 15. The operator can pull the rope head 15 to drive the adjusting rope 10 to slide inside the rotating drum 6, and then drive the toe body 5 to rotate through the connection between the adjusting rope 10 and the toe ring 16 at the base of the toe body 5.
[0052] Working principle:
[0053] S1, Rotation steps for unfolded position (from folded state to unfolded support):
[0054] The artificial nest is in a folded storage state, with the toe body 5 folded upwards and fitting against the outer surface of the nest surface 1. The locking cone 12 is pulled out of the fixing cylinder 11, allowing the adjusting rope 10 to slide freely. The toe body 5 automatically rotates downwards under its own weight, with its end contacting the bottom of the pool. Simultaneously, the rope end 15 can be pulled downwards, and the adjusting rope 10 pulls the toe ring 16 on the toe body 5, forcing the toe body to rotate downwards and ensuring that the end of the toe body 5 touches the ground. The return spring 13 drives the locking cone 12 to re-wedge into the fixing cylinder 11, clamping the adjusting rope 10 and keeping the toe body 5 in the unfolded position.
[0055] In addition, in step S1, the toe body 5 can be manually controlled to force it to rotate downwards. At this time, the adjusting rope 10 is manually tightened through the rope end 15. The adjusting rope 10 is always in a taut state. After the toe body 5 is forcibly controlled to be in the unfolded position, the operating handle is released. Under the action of the return spring 13, the locking cone 12 clamps the adjusting rope 10 again. The adjusting rope 10 can continuously provide tension to the toe body 5 to ensure that the toe body 5 is stably maintained in the unfolded position.
[0056] S2, Folding position rotation steps (from unfolded state to folded storage):
[0057] Pull the rope end handle upwards to release the locking cone 12 and unlock the adjusting rope 10. At this point, the toe body 5 is no longer under tension. After unlocking, the gravity of the recess 1 presses down on the main ring 4, causing the upper end of the toe body 5 to move downwards due to gravity, driving the toe body 5 to rotate upwards around its axis (similar to a flap folding upwards), so that the toe body 5 fits against the outer surface of the recess 1, with the main body section matching the curvature of the recess 1. If the toe body is not completely fitted against the recess 1, the end of the toe body 5 can be manually pushed upwards. At the same time, depending on the actual situation, the rope end 15 can be pulled to tighten the adjusting rope 10 to ensure that the toe body 5 fits tightly against the recess 1. Release the operating handle, and the locking cone 12, under the action of the return spring 13, clamps the adjusting rope 10, fixing the toe body 5 in a folded state. At this time, the artificial nest can be stacked for storage or cleaned and disinfected.
[0058] The bottom diameter of the locking cone 12 is larger than the inner diameter of the fixing cylinder 11, forming a wedge-shaped gap and constituting a wedge-shaped anti-loosening structure. The friction generated by the cone surface pressing against the adjusting rope 10 resists water flow impact. The locking force automatically increases with increasing tension, avoiding the risk of loosening. The return spring 13 continuously provides pulling force under normal conditions, ensuring that the locking cone 12 and the fixing cylinder 11 are always in contact, maintaining the locked state without an additional power source. By controlling the tension of the adjusting rope 10, the toe body 5 can be locked arbitrarily within the rotation range, preferably arbitrarily within the rotation range of 0°-90°, achieving stepless angle adjustment; it can achieve different support heights for the nest surface 1, adapting to different water depths and exhibiting good adjustability and environmental adaptability. The fixing cylinder 11 is connected to the main ring 4 by welding / bolts. The wedge-shaped clamping structure of the locking cone 12 and the adjusting rope 10 can be operated without tools, allowing a single person to complete the placement, position adjustment, and storage of the artificial nest, improving aquaculture management efficiency and making it suitable for large-scale fish farming.
[0059] In this embodiment, when the number of toe bodies 5 is multiple, preferably three, the three toe bodies 5 and the main ring 4 form a three-toe frame, and any one of the toe bodies 5 is rotatably connected to the main ring 4 and is evenly distributed along the circumference of the main ring 4. Figure 8 As shown, each toe body 5 is provided with a toe ring 16, and the adjusting rope 10 is connected in series with the toe rings 16 on the three toe bodies 5, and then connected to a rope adjuster 9. One adjusting rope 10 can be connected to three toe rings 16 at the same time. Specifically, the three toe bodies 5 are the first toe body 17, the second toe body 18, and the third toe body 19. The adjusting rope 10 can first pass through the end of the fixed cylinder 11 of the rope adjuster 9, and then the toe rings 16 on the three toe bodies 5 can be connected in series in the following order:
[0060] First toe body 17: The adjusting rope 10 passes through the toe ring 16 from below and then passes through the toe ring 16 from above and then from below, forming a U-shaped loop;
[0061] Second toe body 18: The adjusting rope 10 extends circumferentially along the main ring 4 and is inserted into the corresponding toe ring 16 on the second toe body 18 in the same U-shape.
[0062] Third toe body 19: The adjusting rope 10 continues to extend circumferentially along the main ring 4, passes through the toe ring 16 on the third toe body 19, and returns to the rope adjuster 9. The adjusting rope 10 enters from one end of the fixed cylinder 1 and exits from the other end, forming a rope end 15. After being connected in series, the adjusting ropes 10 form a closed loop structure, with the three-toe ring 16 located on the loop to ensure even distribution of tension.
[0063] The adjusting rope 10 can also be fixed by knotting at the connection of each toe ring 16; an anti-slip block can be set at the rope end 15 to prevent it from coming out of the fixing cylinder 11 and to prevent it from loosening during long-term underwater use.
[0064] The axis of the fixed cylinder 11 is preferably perpendicular to the bottom surface of the main ring 4. The angle at which the adjusting rope 10 passes through the fixed cylinder 11 is 90°±5° to ensure that the force direction of the three toe bodies 5 is basically the same, to ensure synchronous locking, and at the same time, to enable the three toe bodies 5 to unfold evenly.
[0065] During operation, when the rope head 15 is pulled up, the locking cone 12 disengages from the fixed cylinder 11, and the adjusting rope 10 can slide freely. The three toe bodies 5 rotate synchronously under the action of gravity and / or the tension of the adjusting rope 10. Until all three toe bodies 5 are in the unfolded position, the main ring 4 and the recessed surface 4 are supported to the preset height. The reset spring 13 drives the locking cone 12 to wedge into the fixed cylinder 11, clamping the adjusting rope 10. The three toe bodies 5 maintain the same tilt angle.
[0066] In addition, each toe body 5 is equipped with an independent rope adjuster 9 and an adjusting rope 10, allowing each toe body 5 to be controlled individually. The toe body 5 is a rigid structure, a curved column, and its curvature does not change during rotation. When rotating upwards, the toe body 5 can fold under the socket 1, and when rotating downwards, it can support the main ring 4.
[0067] In one embodiment, a baffle 14 is provided on the main ring 4, fixedly connected to the main ring 4, and located below the rotating cylinder 6. The baffle 14 is positioned along the rotation path of the toe body 5. When the toe body 5 rotates downwards, the main body section in the middle of the toe body 5 abuts against the baffle 14, supporting the toe body 5 and limiting its further rotation. Preferably, when the end of the toe body 5 abuts against the bottom of the pool, the main body of the toe body 5 also abuts against the baffle 14, supporting the main body of the toe body 5 and increasing its stability. Preferably, the curvature of the baffle 14 is also consistent with the curvature of the toe body 5, allowing the baffle 14 to fully conform to the toe body 5. Multiple toe bodies 5 are individually equipped with their own baffles 5 to ensure support and limiting for each toe body 5.
[0068] In one embodiment, the top of the recess 1 is provided with a circular opening to form an upper opening. The diameter of the upper opening is about 40cm, specifically 40±5cm, and the depth of the recess (the vertical distance from the upper opening to the bottom of the recess) is about 15cm, preferably 15±3cm.
[0069] In one embodiment, the fixing cylinder 11 of the rope adjuster 9 is installed on the circumferential outer side of the main ring 4, above or to the side of the rotation connection point of the toe body 5, and can be fixed to the main ring 4 by a special bracket or boss.
[0070] In this invention, the first end of the adjusting rope 10 passes through the rope adjuster 9 on the bottom surface of the main ring 4 and is specifically fixedly connected to the locking cone 12 of the adjuster. Preferably, the adjusting rope 10 passes through the fixed cylinder 11 from bottom to top and is pressed and fixed to the locking cone 12 at the top; after pressing, a certain length of rope end 15 is reserved as the operating end, which is convenient for the operator to pull and unlock. The second end of the adjusting rope 10 can be directly fixedly connected to the toe ring 16. When the toe body 5 rotates to the unfolded position, the rope end 15 can be pulled, and the adjusting rope 10 drives the toe body 5 to rotate downward, thereby unfolding the toe body 5. And when the toe body 5 is unfolded into place, the adjusting rope 10 can be fixed by the locking cone 12, and the adjusting rope 10 continuously applies tension to the toe body 5, so that the toe body 5 is stably maintained in the unfolded position.
[0071] In actual operation:
[0072] During the tilapia breeding season, artificial nests are placed on the bottom of the pond. The folded toe body 5 of the artificial nest is rotated downwards to the baffle 14, ensuring it still contacts the pond bottom. The adjusting rope 10 is then tightened and secured with the rope adjuster 9, supporting the artificial nest and creating a pre-set gap between the nest surface 1 and the pond bottom. The artificial nests are placed 0.5-1.0 meters apart, with the number of nests equal to the number of male fish. After stocking, fry can be bred and harvested. After breeding, the rope is loosened, folding the toe body 5 under the nest surface 1. The adjusting rope 10 is tightened again and secured with the rope adjuster 9. After cleaning and disinfection, the nests can be stacked on top of each other.
[0073] Artificial Nest: An artificial nest is used to replace natural nesting. The surface 1 of the artificial nest is spherical. The surface 1 is divided into an upper, hollow part 3 and a lower, solid part 2. The diameter of the entire artificial nest opening is about 40 cm, and the depth is about 15 cm. The nest frame is the structure that supports the surface 1, including a three-toed frame and a surface support frame 20 (the surface support frame 20 is the same frame as the surface, which can cover and support the surface 1, and the bottom of the surface support frame 20 is set on the main ring 4); this fixes the surface 1 to the main ring 4 of the three-toed frame; the three-toed frame consists of the main ring 4 and toes, the toes support the main ring 4 and can rotate up and down on it. The connection between the toes and the main ring 4 is a toe connection, including a baffle 14 and a rotating cylinder 6. The rotating cylinder 6 is fixed to the main ring 4, and the upper end of the toe has a small section that is bent at nearly 90 degrees. This small section is located inside the rotating cylinder 6, and its end has a fixing cap to prevent the toe from coming out of the rotating cylinder 6. A baffle plate 14 is fixed on the main ring 4 below the rotating drum 6. The baffle plate 14 is V-shaped with respect to the horizontal plane of the main ring 4. The baffle plate 14 can be folded downward relative to the main ring 4 and is stopped when the toe body 5 rotates downward to the baffle plate 14. There is a toe ring 16 near the lower end of the toe body 5. An adjusting rope 10 passes through the toe ring 16. The adjusting rope 10 is adjusted by the rope adjuster 9. When the toe is contracted downward and fixed, the main ring 4 is supported; when the toe is contracted upward, the toe is folded under the socket 1.
[0074] Example 1:
[0075] During the tilapia breeding season, artificial nest breeding is used in some tilapia ponds. There are currently 5 breeding ponds with a total area of 2 mu (approximately 0.33 hectares) each. 250 male tilapia are stocked per mu, and 250 artificial nests are placed there. The specific technical plan is as follows:
[0076] Artificial nests are set up at the bottom of the pond. The folded toe body 5 of the artificial nest is rotated downwards to the baffle 14. The adjusting rope 10 is tightened and secured with the rope adjuster 9, thus supporting the artificial nest. The artificial nests are placed 1.0 meter apart. After the fish are released, fry can be spawned and harvested. The day after the broodstock are paired, some female fish were found to have fertilized eggs in their mouths, which is 4 days earlier than the traditional method. After the breeding season, the average fry yield per 100 catties of broodstock increased by more than 15%, the pond water quality was good, and no diseases occurred. After the breeding season, the adjusting rope 10 is released so that the toe body 5 is folded under the nest surface 1. The adjusting rope 10 is tightened again and secured with the rope adjuster 9. After cleaning and disinfection, the nests can be stacked.
[0077] Example 2:
[0078] During the tilapia breeding season, artificial nest breeding is used in some tilapia ponds. There are currently 10 cement breeding ponds, each 0.5 mu (approximately 0.067 hectares) in size. 300 male tilapia are stocked per mu, along with 300 artificial nests. The specific technical plan is as follows:
[0079] Artificial nests are set up at the bottom of the pond. The folded toe body 5 of the artificial nest is rotated downwards to the baffle 14. The adjusting rope 10 is tightened and secured with the rope adjuster 9, thus supporting the nest. The artificial nests are placed 0.5 meters apart. After the fish are released, fry can be spawned and harvested. The day after the parent fish are paired, some female fish were found to have fertilized eggs in their mouths, 5 days earlier than the traditional method. After the breeding season, the average fry yield per 100 catties of parent fish increased by more than 15%, the pond water quality was good, and no diseases occurred. After the breeding season, the adjusting rope 10 is released so that the toe body 5 is folded under the nest surface 1. The adjusting rope 10 is tightened again and secured with the rope adjuster 9. After cleaning and disinfection, multiple artificial nests can be stacked on top of each other.
[0080] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0081] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. An artificial nest for fish farming, characterized in that, include: The recessed surface (1) includes a solid part (2) and a virtual part (3) disposed above the solid part (2). The solid part (2) is a closed shell, and the virtual part (3) is a porous structure and forms a water-permeable layer. The frame includes a main ring (4) and a toe body (5) rotatably disposed on the main ring (4). The bottom of the socket surface (1) is connected to the main ring (4). The toe body (5) has an arc-shaped structure. The arc of the toe body (5) matches the curvature of the socket surface (1). The rotation trajectory of the toe body (5) includes a folding position and an unfolding position for suspending the socket surface (1) above a preset support surface. The toe body (5) located at the folding position is in contact with the outer surface of the frame. The toe body (5) located in the unfolded position is supported on a preset support surface, and the main ring (4) has a support gap with the preset support surface.
2. The artificial nest for fish farming according to claim 1, characterized in that, The number of toe bodies (5) is at least three, and any one of the toe bodies (5) is rotatably connected to the main ring (4).
3. The artificial nest for fish farming according to claim 1, characterized in that, The toe body (5) is rotatably connected to the main ring (4) via a rotating connection assembly. The rotating connection assembly includes a rotating cylinder (6) fixed to the main ring (4) and a curved section (7) disposed at the end of the toe body (5). The curved section (7) is inserted into the rotating cylinder (6) and rotates with the rotating cylinder (6). The end of the curved section (7) is provided with a limiting cap (8) to prevent the curved section (7) from coming out of the rotating cylinder (6).
4. The artificial nest for fish farming according to claim 1, characterized in that, It also includes a rope adjuster (9), on which a toe loop (16) is provided, and an adjusting rope (10) is passed through the toe loop (16) and connected to the rope adjuster (9); the rope adjuster (9) includes a locking component for locking the adjusting rope (10).
5. The artificial nest for fish farming according to claim 4, characterized in that, The rope adjuster (9) also includes a fixed cylinder (11), which is fixed to the main ring (4); the locking assembly includes a locking cone (12) and a return spring (13): the cone tip of the locking cone (12) is inserted into the fixed cylinder (11), and the cone tip and the inner wall surface of the fixed cylinder (11) form a clamping area for clamping the adjusting rope (10); one end of the return spring (13) is connected to the crossbar at the end of the fixed cylinder (11), and the other end of the return spring (13) is connected to the cone tip of the locking cone (12).
6. The artificial nest for fish farming according to claim 5, characterized in that, The bottom diameter of the locking cone (12) is larger than the inner diameter of the fixing cylinder (11), and the bottom surface of the locking cone (12) is provided with an operating handle.
7. The artificial nest for fish farming according to claim 5, characterized in that, The adjusting rope (10) passes through the fixed cylinder (11), and the adjusting rope (10) includes a rope end (15) protruding from the fixed cylinder (11).
8. The artificial nest for fish farming according to claim 3, characterized in that, The main ring (4) is provided with a baffle (14) for supporting the toe body (5). The baffle (14) is located below the rotating cylinder (6) and is located on the rotation path of the toe body (5).
9. The artificial nest for fish farming according to claim 1, characterized in that, The top of the recess (1) is provided with a circular opening, the diameter of which is between 35-45cm.
10. The artificial nest for fish farming according to claim 9, characterized in that, The vertical distance from the circular opening to the bottom of the recess (1) is between 12 and 18 cm.