A cage device for cultivating sand snakehead

Abstract

The present invention discloses a net cage device for aquaculture of sand snakeheads, comprising a net cage, a cone, a sinker, and a rope. The net cage is formed by sewing a bottom mesh sheet and a peripheral mesh sheet, the mesh sheet being provided with a plurality of circular holes, the edges of the circular holes being sewn to the fan-shaped mesh sheet to form an embedded cone with a closed top, the sinker being sewn to the periphery of the bottom of the net cage so that the net cage extends into the water body; the rope being passed through the periphery of the top of the net cage, and the tail of the rope being used to secure the net cage. The net cage device of the present invention has a strong and simple structure, a long service life, is suitable for a variety of specifications, has a wide range of uses, is convenient for daily management during aquaculture, is convenient for anytime and quantitative fishing, reduces fishing intensity and fish fishing stress, and improves fishing efficiency; at the same time, it meets the needs of sand snakehead juveniles and adult fish for a hidden habitat, reduces spatial competition of sand snakeheads, increases the level of sand snakeheads' feeding on bait organisms, reduces energy consumption, and promotes growth.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture, relates to a sand snakehead aquaculture technology, and particularly relates to a net cage device for sand snakehead aquaculture. Background Art

[0002] Sand snakeheads are benthic carnivores. In both natural and aquaculture waters, they often ambush prey in sheltered areas such as aquatic plants, rocks, and crevices, demonstrating a strong need for sheltered habitats. Currently, sand snakeheads are mostly cultured in mixed cultures, making them difficult to capture at any given time. Furthermore, the bottoms of aquaculture waters are often uneven, often covered in submerged plants, making them difficult to operate nets and resulting in low capture efficiency. Sand snakeheads can be successfully cultured in cages, but this approach results in a lower predation rate and slower growth. Summary of the Invention

[0003] Currently, the main problems in the existing technology include:

[0004] (1) In the polyculture model, the density of sand snakehead is low and the quantity is small, which makes it difficult to catch them at any time and in sufficient quantities.

[0005] (2) The bottom of the pond is uneven, which makes it difficult to use a dragnet to catch the fish during the harvest season. The trapping rate is low, which is not conducive to the complete capture of the snakehead fish and greatly increases the intensity of fishing.

[0006] (3) Cage culture space is small, which increases intraspecific competition among sand snakeheads. The encounter rate between sand snakeheads and prey organisms is greatly increased, which increases the anti-predation ability of prey organisms, making it unfavorable for sand snakeheads to prey and grow. The complexity of the habitat can be increased by adding biological floating beds, but the growth cycle of aquatic plants in floating beds is short, the biomass fluctuates greatly, and it is difficult to manage. This can easily lead to problems such as aquatic plant rotting, deteriorating water quality, and fish hypoxia, making it unfavorable for long-term, large-scale utilization.

[0007] In order to solve the above problems, the present invention provides a net cage device for cultivating sand snakehead, which mainly includes: a net cage, a cone, a sinker and a rope. The bottom of the net cage is circular or polygonal, and a plurality of cones are arranged on the bottom and sides of the net cage. The cones have closed tops and the sides are composed of fan-shaped meshes. The sinkers are fixed around the bottom of the net cage with a spacing of about 1 meter, so that the net cage is extended in the water body. The rope passes through the periphery of the top of the net cage, the length of the rope is greater than the length of the periphery of the top of the net cage, and the thickness of the rope is adjusted according to the size of the net cage. Four diagonal knots are selected and part of the rope is retained to fix the net cage or facilitate the lifting of the net cage.

[0008] Furthermore, the cone tip on the side of the cage faces a direction consistent with the radius of the cage bottom, and the cone tip on the bottom of the cage faces a direction perpendicular to the cage bottom.

[0009] Furthermore, circular holes are provided on the bottom surface and the side surfaces of the mesh box, and the edges of the circular holes are connected to the fan-shaped mesh to form the cone.

[0010] Furthermore, the side length of the cone is a, and the height of the cone is 30cm≥a≥5cm.

[0011] Furthermore, the cones are arranged in an array with equal spacing on the side of the cage, and the center spacing between the cones is b, b≥a.

[0012] Furthermore, the height c of the cone array on the side of the cage does not exceed the overall height of the cage.

[0013] Furthermore, a mesh cover is provided on the top of the mesh box or no mesh cover is provided.

[0014] Compared to aquaculture cages without vertebrae, the present invention adds multiple cones to the bottom and sides of the cage, which can solve the problem that the cage aquaculture habitat is simple and not conducive to the cultivation of sand snakeheads. The cones divide the aquaculture cage into multiple small environments, increasing the complexity of the cage habitat structure. The sand snakehead population hides in the multiple cones, reducing the encounter rate between individual sand snakeheads and helping to reduce the spatial competition of sand snakeheads. The complex habitat structure can also reduce the encounter rate between sand snakeheads and bait organisms, reduce the anti-predation ability of bait organisms, increase the ambush capture rate of predators, and promote the predation and growth of sand snakeheads. Aquaculture cages equipped with cones greatly alleviate the demand for the use of floating bed organisms and can be used for a long time and on a large scale.

[0015] At the same time, the combination of aquaculture cages makes it easy to catch sand snakeheads at any time, solves the problem of difficult fishing of sand snakeheads, reduces fishing intensity and fishing stress level of fish, and is beneficial to the breeding of sand snakeheads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 This is a structural diagram of a cage in an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of the arrangement of circular holes with the same diameter as the bottom surface of the cone in an embodiment of the present invention; DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings, wherein the specific embodiments and descriptions are only used to explain the present invention but not to limit the present invention.

[0020] like Figure 1As shown, the present invention discloses a net cage device for cultivating sand snakehead, comprising a net cage 1, a cone 2, a sinker 3, and a rope 4; the bottom surface of the net cage 1 is a circular or polygonal mesh, the net cage 1 is cylindrical or polygonal, the bottom and side surfaces of the net cage 1 are both sewn together by mesh, the mesh size of the mesh is adjusted according to the specifications of the fish body to be placed, the bottom mesh and side mesh of the net cage 1 are provided with a plurality of circular holes cut into a diameter a, the edges of the circular holes are sewn together with the fan-shaped mesh to form an embedded bottomless cone 2, the side length of the cone 2 is a, and the height of the cone 2 is 1. 30cm≥a≥5cm.

[0021] like Figure 2 As shown, the cones 2 are arranged in an equidistant array, the spacing between the cones 2 is b, b≥a, and the height c of the cone array arranged on the side of the box does not exceed 2 / 3 of the overall height of the cage.

[0022] The sinkers 3 are sewn around the bottom of the cage 1, and the distance between the sinkers is about 1 meter, so that the cage is stretched in the water.

[0023] A common mesh is set on the top of the cage, or the mesh is not sewn together. The rope 4 passes through the periphery of the top of the cage. The rope length is greater than the circumference of the top of the cage. The rope thickness is adjusted according to the size of the cage. Four diagonal knots are selected and part of the rope is retained to fix the cage or facilitate lifting the cage.

[0024] In some embodiments, according to the requirements of use, a mesh with suitable mesh size and material is selected, and the fan-shaped mesh and the circular hole of the mesh are sewn together to form an embedded cone; the sinker is sewn on, and the specifications of the sinker can be adjusted according to the size of the cage; the rope on the top of the cage is passed through, and after tying a knot and retaining the rope of appropriate length, the cage is placed in the predetermined position. After fixing the rope, the cage is stretched as much as possible, and then the sand snakehead individuals and bait organisms can be released.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

[0026] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

Claims

1. A net cage device for cultivating sand snakehead, comprising a net cage, a cone, a sinker and a rope, characterized in that: The bottom of the cage is circular or polygonal, and a plurality of cones are arranged on the bottom and sides of the cage. The tops of the cones are closed, and the sides are composed of fan-shaped meshes. The top of the cone on the side of the cage faces a direction consistent with the radial direction of the bottom of the cage, and the top of the cone on the bottom of the cage faces a direction perpendicular to the bottom of the cage; The bottom and side surfaces of the cage are provided with circular holes, and the edges of the circular holes are connected to the fan-shaped mesh to form the cone; The side length of the cone is a, 30cm≥a≥5cm; The cones are arranged in an array with equal spacing on the side of the cage, and the center spacing between the cones is b, b ≥ a; The height c of the cone array on the side of the cage does not exceed the overall height of the cage.

2. The net cage device for cultivating sand snakehead as claimed in claim 1, characterized in that: A mesh cover is provided on the top of the net box.

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