A net bag for improving the survival rate of fish caught on shore
By designing a net net capsule including rectangular frame capsules, cylindrical cages and layered round cylindrical capsules, fish and shrimps are treated with separating fences and whisker mouths, the problem of low survival rate of net fishing is solved, and fish and shrimps are realized The effective survival of the class has increased the economic benefits of fishermen.
Patent Information
- Application Number
- CN202211316886.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-26
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2042-10-26
AI Technical Summary
The low survival rate of net catches leads to low economic value, hindering the popularity of fishermen using compliant fishing gear, and fishermen may use smaller mesh-sized net bags to capture more fishing catches, forming a vicious cycle.
A mesh net capsule including a rectangular frame capsule, a cylindrical cage and a layered round capsule was designed. Fish and shrimp were treated separately by separating the fence and the inverted mouth, and the mesh net capsules of different mesh sizes were used to separate the sizes. Different fishes are wrapped with stainless steel sheets to stabilize the water flow and ensure the survival of fish and shrimps.
It effectively improves the survival rate of the fishing catch, reduces the damage and escape of the fishing catch, and increases the income of fishermen.
Smart Images
Figure CN115885942B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an aquatic fishing device, in particular to a net bag for improving the survival rate of fish caught on shore. Background Art
[0002] The spread net is one of the most important custom fishing gears along the northern coast of the South China Sea. It has been vigorously developed due to its advantages such as small scale, low cost and convenient operation. However, its small mesh size and poor selectivity have seriously damaged the sustainable development of offshore fishery resources. In recent years, the state has successively formulated corresponding minimum mesh size fishery management regulations, but in actual surveys, the minimum mesh size of the spread nets in the offshore of the South China Sea rarely meets the standard; coupled with the low survival rate of the fish caught on land by the spread net, the economic value is relatively low, which further hinders the enthusiasm of fishermen to use compliant fishing gear for operations, and even further use nets with smaller mesh sizes in order to capture more fish, thus forming a vicious circle. Therefore, for the spread net operation, it is particularly important to develop and design a spread net net that can effectively improve the survival rate of the fish caught on land, which can effectively increase the income of fishermen. Summary of the invention
[0003] The purpose of the present invention is to provide a net bag for raising the survival rate of fish caught on land, which can effectively solve the problem of low survival rate of fish caught in the net, thereby increasing the income of fishermen.
[0004] The above-mentioned object of the present invention is achieved through the following technical scheme: a net bag for raising the survival rate of fish landing, characterized in that: the net bag comprises a rectangular frame bag, a cylindrical cage bag and a layered truncated cone bag, the rectangular frame bag comprises a rectangular frame and a rhombus mesh net bag wrapping the rectangular frame along the circumferential direction, the rectangular frame bag has a bag opening on the left side for connecting the net body and a connecting opening on the right side opposite to the bag opening; the rectangular frame bag is internally provided with a partition fence, the partition fence is obliquely arranged, the partition fence is respectively connected to the bottom frame and the right side frame of the rectangular frame, and the connecting opening is divided into an upper connecting opening and a lower connecting opening, the layered truncated cone bag is connected to the upper connecting opening, and the cylindrical cage bag is connected to the lower connecting opening; the cage opening of the cylindrical cage bag is provided with a reversed beard opening, the layered truncated cone bag is layered with multiple layers of truncated cone frames, and adjacent truncated cone frames alternately wrap the rhombus mesh net bag and the stainless steel sheet in turn.
[0005] In the present invention, the length, width and height specifications of the rectangular frame are 1.0m×0.6m×0.6m. The rectangular frame is welded with a stainless steel pipe with a diameter of 6mm. The diamond mesh bag wrapping the rectangular frame has a mesh size of 35mm, 88 meshes in the horizontal circumference, and 46 meshes in the vertical circumference.
[0006] In the present invention, the partition fence is rectangular, and the partition fence is respectively connected to the bottom center line and the right side center line of the rectangular frame. The width of the partition fence is 600mm, and the length of the hypotenuse is 583mm. The partition fence is welded on the rectangular frame with stainless steel with a diameter of 6mm. The partition fence includes 24 stainless steel pipes with a diameter of 3mm, and the interval between adjacent stainless steel pipes is 25mm.
[0007] In the present invention, the cylindrical cage bag comprises a cylindrical cage frame and a diamond mesh bag wrapping the cylindrical cage frame, the bottom diameter of the cylindrical cage bag is 500 mm, the height is 300 mm, the side of the cylindrical cage bag has a rectangular cage mouth, the bottom side of the rectangular cage mouth is 200 mm long, and the height is 300 mm, the mesh size of the diamond mesh bag wrapping the cylindrical cage frame is 25 mm, and the number of circumferential meshes is 262 meshes; the inverted beard mouth is located in the rectangular cage mouth, the inverted beard mouth is a truncated cone, the outer end opening diameter is 180 mm, the inner end opening diameter is 65 mm, and the truncated cone height is 90 mm.
[0008] In the present invention, the cylindrical cage bag is connected to the lower connecting port through a lower connecting mesh bag, and the lower connecting mesh bag is a diamond mesh bag with a mesh size of 25 mm, a circumferential mesh number of 180 meshes, and a longitudinal mesh number of 44 meshes.
[0009] In the present invention, the layered truncated cone bag is provided with four layers of truncated cone frames, namely a first-layer truncated cone frame, a second-layer truncated cone frame, a third-layer truncated cone frame and a fourth-layer truncated cone frame located at the tail layer, the first-layer truncated cone frame is connected to the upper connecting port, wherein the open end frame of the first-layer truncated cone frame is connected to the upper connecting port through an upper connecting mesh bag, the tail end frame of the first-layer truncated cone frame is the open end frame of the second-layer truncated cone frame, the first-layer truncated cone frame is wrapped with a diamond mesh bag, the side surface and the tail end frame of the second-layer truncated cone frame are wrapped with stainless steel sheets, which are welded after wrapping to form a barrel body with only one side opening; the open end frame of the third-layer truncated cone frame is formed by extending the tail end frame of the second-layer truncated cone frame outward, the tail end frame is the open end frame of the fourth-layer truncated cone frame, the third-layer truncated cone frame is wrapped with a diamond mesh bag, which extends to the open end frame of the first-layer truncated cone frame during wrapping, the side surface and the tail end frame of the fourth-layer truncated cone frame are wrapped with stainless steel sheets, which are welded after wrapping to form a barrel body with only one side opening.
[0010] In the present invention, the upper connecting mesh bag is a diamond mesh bag, the mesh size of the mesh bag is 35 mm, the mesh number of the mesh bag circumference is 128 meshes, and the mesh number of the mesh bag longitudinally is 64 meshes.
[0011] In the present invention, the first-layer truncated cone frame is welded with a stainless steel pipe with a diameter of 6 mm. The circular area enclosed by the open end skeleton of the first-layer truncated cone frame is larger than the circular area enclosed by the tail end skeleton. The diameter of the circle enclosed by the open end skeleton is 1 m, the diameter of the circle enclosed by the tail end skeleton is 0.8 m, and the distance between the center point of the open end skeleton and the center point of the tail end skeleton is 0.5 m. The diamond mesh bag that wraps the first-layer truncated cone frame has a mesh size of 50 mm, 81 meshes of the open end circumference, 65 meshes of the tail end circumference, and 16 meshes in the longitudinal direction; the second-layer truncated cone frame is welded with a stainless steel pipe with a diameter of 6 mm. The diameter of the circle enclosed by the open end skeleton is 0.8 m, the diameter of the circle enclosed by the tail end skeleton is 0.6 m, and the distance between the center point of the open end skeleton and the center point of the tail end skeleton is 0.5 m.
[0012] In the present invention, the third-layer truncated cone frame is welded with a stainless steel pipe with a diameter of 6 mm. The diameter of the circle surrounded by the open end skeleton is 0.8 m, the diameter of the circle surrounded by the tail end skeleton is 0.7 m, the distance between the center point of the open end skeleton and the center point of the tail end skeleton is 0.25 m, and the diamond mesh bag that wraps the third-layer truncated cone frame has a mesh size of 35 mm, the number of meshes of the open end circumference is 138 meshes, the number of meshes of the tail end circumference is 81 meshes, and the number of meshes in the longitudinal direction is 58 meshes.
[0013] In the present invention, the fourth-layer truncated cone frame is welded with a stainless steel pipe with a diameter of 6 mm. The diameter of the circle surrounded by the open end frame is 0.7 m, the diameter of the circle surrounded by the tail end frame is 0.6 m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.25 m.
[0014] During the net setting process, the fish and shrimps that enter the net bag gradually move backwards under the action of the water flow, and then enter the rectangular frame. The mesh contraction coefficient of the net bag outside the rectangular frame is high, and the mesh expansion is large. Some small fish and shrimps will escape from the mesh and then contact the separation fence. After the shrimps contact the separation fence, they will pass through the fence and enter the cylindrical cage body. The cylindrical cage body is a rigid structure with an inverted mouth inside the cage. After the shrimps enter, they will not be squeezed, which can ensure the survival of the shrimps, and the shrimps will stay in it as a refuge to avoid predation; after the fish contact the separation fence, they will continue to swim upward along the fence, and then enter the upper net bag, and finally enter the layered cage. In the first layer of the truncated cone frame, small fish will escape through the large mesh inside the truncated cone frame and enter the two lowest layers of the truncated cone frame, while large fish cannot pass through the large mesh and enter the second layer of the truncated cone frame. This layer of the truncated cone frame is wrapped with stainless steel sheets, which can ensure that the water flow in the truncated cone frame is in a stable state, reduce the damage to the fish, and thus ensure the survival of the fish; for the fish that escape into the lower two layers of the truncated cone frame, some smaller fish will escape from the mesh wrapped in the third layer of the truncated cone frame, while the fish that cannot escape will stay in the bottom layer of the truncated cone frame, which is also wrapped with stainless steel sheets, which can ensure that the water flow in the truncated cone frame is in a stable state, thus ensuring the survival of the fish.
[0015] Compared with the prior art, the present invention first releases some small fish and shrimps through a rectangular frame, and then sets a separation fence in the rectangular frame. By using the behavioral differences between shrimps and fish in front of the separation fence, the fish and shrimps are separated and put into corresponding net bags, and then a cylindrical cage with an inverted beard mouth is set for the shrimps to ensure the survival of the shrimps. A layered truncated cone frame is set for the fish, and firstly, net bags of different mesh sizes are used to separate fish of different sizes, and then stainless steel sheets are used to wrap them to ensure that the water flow in the truncated cone frame is in a stable state, thereby ensuring the survival of the fish. The present invention can effectively solve the problem of low survival rate of fish caught by setting nets, thereby increasing the income of fishermen. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0017] Figure 1 It is a schematic diagram of the overall structure of the net bag for raising the survival rate of fish caught on shore according to the present invention;
[0018] Figure 2 The invention is a schematic structural diagram of a four-layer truncated cone frame in a net bag for raising the survival rate of fish caught on land.
[0019] Description of Reference Numerals
[0020] 1. Rectangular frame bag; 11. Bag opening; 12. Upper connection opening; 13. Lower connection opening;
[0021] 2. Separation fence; 3. Cylindrical cage; 31. Inverted whisker mouth; 4. Lower connection net bag;
[0022] 5. Layered truncated cone capsule; 51. First-layer truncated cone frame; 52. Second-layer truncated cone frame;
[0023] 53. The third-layer truncated cone frame; 54. The fourth-layer truncated cone frame; 6. The upper connected mesh bag. DETAILED DESCRIPTION
[0024] like Figure 1 , Figure 2 The net bag for raising the survival rate of fish landing shown in the figure comprises a rectangular frame bag 1, a cylindrical cage bag 3 and a layered truncated cone bag 5. The rectangular frame bag 1 comprises a rectangular frame and a rhombus mesh net bag wrapping the rectangular frame in the circumferential direction. The rectangular frame bag 1 has a bag opening 11 located on the left side for connecting the net body and a connecting opening located on the right side opposite to the bag opening. The rectangular frame bag 1 is provided with a partition fence 2 therein. The partition fence 2 is arranged obliquely. The partition fence 2 is respectively connected to the bottom frame and the right side frame of the rectangular frame, and the connecting opening is divided into an upper connecting opening 12 and a lower connecting opening 13. The layered truncated cone bag 5 is connected to the upper connecting opening 12, and the cylindrical cage bag 3 is connected to the lower connecting opening 13. The cage opening of the cylindrical cage bag 3 is provided with a bark inverting opening 31. The layered truncated cone bag 5 is provided with multiple layers of truncated cone frames in layers, and adjacent truncated cone frames alternately wrap the rhombus mesh net bag and the stainless steel sheet in sequence.
[0025] In this embodiment, the length, width and height specifications of the rectangular frame are 1.0m×0.6m×0.6m. The rectangular frame is welded with a stainless steel pipe with a diameter of 6mm. The diamond mesh bag that wraps the rectangular frame has a mesh size of 35mm, 88 meshes in the horizontal circumference, and 46 meshes in the vertical direction. When the bag is assembled, the transverse shrinkage coefficient is 0.779, and the transverse shrinkage coefficient can also be taken in the range of 0.6 to 0.8.
[0026] The partition fence 2 is rectangular and is connected to the bottom center line and the right side center line of the rectangular frame respectively. The width of the partition fence 2 is 600mm and the length of the hypotenuse is 583mm. The partition fence 2 is welded on the rectangular frame with stainless steel with a diameter of 6mm. The partition fence 2 includes 24 stainless steel pipes with a diameter of 3mm, and the interval between adjacent stainless steel pipes is 25mm.
[0027] The cylindrical cage bag 3 includes a cylindrical cage frame and a diamond mesh bag wrapping the cylindrical cage frame. The bottom diameter of the cylindrical cage bag 3 is 500 mm and the height is 300 mm. The side of the cylindrical cage bag 3 has a rectangular cage mouth. The bottom side of the rectangular cage mouth is 200 mm long and the height is 300 mm. The mesh size of the diamond mesh bag wrapping the cylindrical cage frame is 25 mm, the circumferential mesh number is 262 meshes, and the transverse shrinkage coefficient is 0.24 when the bag is assembled. The transverse shrinkage coefficient can also be taken in the range of 0.2 to 0.4. The inverted beard mouth 31 is located in the rectangular cage mouth. The inverted beard mouth 31 is a truncated cone, the outer end opening diameter is 180 mm, the inner end opening diameter is 65 mm, and the truncated cone height is 90 mm.
[0028] In this embodiment, the cylindrical cage bag 3 is connected to the lower connection port 13 through the lower connection mesh bag 4. The lower connection mesh bag 4 is a diamond mesh bag, the mesh size of the mesh bag is 25 mm, the mesh number of the mesh bag circumference is 180 meshes, the transverse shrinkage coefficient is 0.4 when the mesh bag is assembled, and the transverse shrinkage coefficient can also be in the range of 0.3 to 0.5, and the longitudinal mesh number of the mesh bag is 44 meshes.
[0029] In this embodiment, the layered truncated cone capsule 5 is provided with four layers of truncated cone frames, namely a first-layer truncated cone frame 51, a second-layer truncated cone frame 52, a third-layer truncated cone frame 53 and a fourth-layer truncated cone frame 54 located at the tail layer. The first-layer truncated cone frame 51 is connected to the upper connection port 12, wherein the open end frame of the first-layer truncated cone frame 51 is connected to the upper connection port 12 through the upper connection net bag 6, the tail end frame of the first-layer truncated cone frame 51 is the open end frame of the second-layer truncated cone frame 52, the first-layer truncated cone frame 51 is wrapped with a diamond mesh net bag, and the side of the second-layer truncated cone frame 52 is connected to the upper connection port 12 through the upper connection net bag 6. The surface and the tail end frame are wrapped with stainless steel sheets, which are welded after wrapping to form a barrel body with only one side open; the open end frame of the third-layer truncated cone frame 53 is formed by extending the tail end frame of the second-layer truncated cone frame 52 outward, and the tail end frame is the open end frame of the fourth-layer truncated cone frame 54. The third-layer truncated cone frame 53 is wrapped with a diamond mesh bag, which extends to the open end frame of the first-layer truncated cone frame 51 during wrapping, and the side and tail end frames of the fourth-layer truncated cone frame 54 are wrapped with stainless steel sheets, which are welded after wrapping to form a barrel body with only one side open.
[0030] The layered truncated cone frame of the present invention is divided into four layers, which are welded into a whole by stainless steel pipes. Each layer of the truncated cone frame is wrapped by a diamond mesh bag, a stainless steel sheet, a diamond mesh bag and a stainless steel sheet from top to bottom.
[0031] The upper connecting mesh bag 6 is a diamond mesh mesh bag with a mesh size of 35 mm and a mesh number of 128 meshes on the circumference of the mesh bag. When the mesh bag is assembled, the transverse shrinkage coefficient is 0.4, and the transverse shrinkage coefficient can also be taken in the range of 0.3 to 0.5. The longitudinal mesh number of the mesh bag is 64 meshes.
[0032] The first-layer truncated cone frame 51 is welded with a stainless steel pipe with a diameter of 6 mm. The circular area enclosed by the open end frame of the first-layer truncated cone frame 51 is larger than the circular area enclosed by the tail end frame. The diameter of the circle enclosed by the open end frame is 1 m, and the diameter of the circle enclosed by the tail end frame is 0.8 m. The distance between the center point of the open end frame and the center point of the tail end frame is 0.5 m. The diamond mesh bag that wraps the first-layer truncated cone frame 51 has a mesh size of 50 mm, 81 meshes on the circumference of the open end, 65 meshes on the circumference of the tail end, and 16 meshes in the longitudinal direction. When the bag is assembled, the transverse shrinkage coefficient is 0.779, and the transverse shrinkage coefficient can also be taken in the range of 0.6 to 0.8.
[0033] The second-layer truncated cone frame 52 is welded with 6mm diameter stainless steel pipes. The diameter of the circle surrounded by the open end frame is 0.8m, the diameter of the circle surrounded by the tail end frame is 0.6m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.5m.
[0034] The third-layer truncated cone frame 53 is welded with a stainless steel pipe with a diameter of 6 mm. The diameter of the circle surrounded by the open end frame is 0.8 m, the diameter of the circle surrounded by the tail end frame is 0.7 m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.25 m. The diamond mesh bag that wraps the third-layer truncated cone frame 53 has a mesh size of 35 mm, 138 meshes on the circumference of the open end, 81 meshes on the circumference of the tail end, and 58 meshes in the longitudinal direction. When the bag is assembled, the transverse shrinkage coefficient is 0.779, and the transverse shrinkage coefficient can also be taken in the range of 0.6 to 0.8.
[0035] The fourth-layer truncated cone frame 54 is welded with a stainless steel pipe with a diameter of 6 mm. The diameter of the circle surrounded by the open end frame is 0.7 m, the diameter of the circle surrounded by the tail end frame is 0.6 m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.25 m.
[0036] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.
Claims
1. A net bag for increasing the survival rate of fish caught on land, characterized in that: The net bag comprises a rectangular frame bag (1), a cylindrical cage bag (3) and a layered frustum bag (5); the rectangular frame bag (1) comprises a rectangular frame and a diamond mesh net bag wrapping the rectangular frame in the circumferential direction; the rectangular frame bag (1) has a bag opening (11) located on the left side for connecting the net body and a connecting opening located on the right side opposite to the bag opening; the rectangular frame bag (1) is internally provided with a partition fence (2); the partition fence (2) is obliquely arranged, and the partition fence (2) is respectively connected to the bottom frame and the right frame of the rectangular frame. The tiered truncated cone capsule (5) is connected to a frame, and the connection port is divided into an upper connection port (12) and a lower connection port (13); the tiered truncated cone capsule (5) is connected to the upper connection port (12), and the cylindrical cage capsule (3) is connected to the lower connection port (13); a beard inverting port (31) is provided at the cage opening of the cylindrical cage capsule (3); the tiered truncated cone capsule (5) is provided with multiple layers of truncated cone frames in layers, and adjacent truncated cone frames are alternately wrapped with a diamond mesh bag and a stainless steel sheet in sequence; the tiered truncated cone capsule (5) is provided with four layers of truncated cone frames, namely, a first layer truncated cone frame, a second ... (51), a second-layer truncated cone frame (52), a third-layer truncated cone frame (53) and a fourth-layer truncated cone frame (54) located at the tail layer, the first-layer truncated cone frame (51) is connected to the upper connection port (12), wherein the open end frame of the first-layer truncated cone frame (51) is connected to the upper connection port (12) through the upper connection mesh bag (6), the tail end frame of the first-layer truncated cone frame (51) is the open end frame of the second-layer truncated cone frame (52), the first-layer truncated cone frame (51) is wrapped with a diamond mesh bag, the side and tail end frame of the second-layer truncated cone frame (52) The outside of the third-layer truncated cone frame (53) is wrapped with stainless steel sheets, which are then welded to form a barrel body with only one side open; the open end frame of the third-layer truncated cone frame (53) is formed by extending the tail end frame of the second-layer truncated cone frame (52) outward, and the tail end frame is the open end frame of the fourth-layer truncated cone frame (54); the outside of the third-layer truncated cone frame (53) is wrapped with a diamond mesh bag, which extends to the open end frame of the first-layer truncated cone frame (51) during wrapping; the side surface and the tail end frame of the fourth-layer truncated cone frame (54) are wrapped with stainless steel sheets, which are then welded to form a barrel body with only one side open.
2. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The length, width and height of the rectangular frame are 1.0m×0.6m×0.6m. The rectangular frame is welded with a stainless steel pipe with a diameter of 6mm. The diamond mesh bag wrapped around the rectangular frame has a mesh size of 35mm, 88 meshes in the horizontal circumference and 46 meshes in the vertical circumference.
3. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The partition fence (2) is rectangular and is connected to the bottom center line and the right side center line of the rectangular frame respectively. The width of the partition fence (2) is 600 mm and the length of the hypotenuse is 583 mm. The partition fence (2) is welded to the rectangular frame with stainless steel with a diameter of 6 mm. The partition fence (2) includes 24 stainless steel pipes with a diameter of 3 mm, and the interval between adjacent stainless steel pipes is 25 mm.
4. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The cylindrical cage bag (3) comprises a cylindrical cage frame and a diamond mesh bag wrapping the cylindrical cage frame, the bottom diameter of the cylindrical cage bag (3) is 500 mm, the height is 300 mm, the side of the cylindrical cage bag (3) has a rectangular cage mouth, the bottom side of the rectangular cage mouth is 200 mm long, and the height is 300 mm, the mesh size of the diamond mesh bag wrapping the cylindrical cage frame is 25 mm, and the number of circumferential meshes is 262 meshes; the inverted beard opening (31) is located in the rectangular cage opening, the inverted beard opening (31) is a truncated cone shape, the outer end opening diameter is 180 mm, the inner end opening diameter is 65 mm, and the truncated cone height is 90 mm.
5. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The cylindrical cage bag (3) is connected to the lower connecting port (13) via a lower connecting mesh bag (4), and the lower connecting mesh bag (4) is a diamond mesh bag with a mesh size of 25 mm, a mesh number of 180 meshes around the circumference of the mesh bag, and a mesh number of 44 meshes in the longitudinal direction of the mesh bag.
6. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The upper connecting mesh bag (6) is a diamond mesh bag, the mesh size of the mesh bag is 35 mm, the mesh number of the mesh bag circumference is 128 meshes, and the mesh number of the mesh bag longitudinally is 64 meshes.
7. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The first-layer truncated cone frame (51) is welded by a stainless steel pipe with a diameter of 6 mm. The circular area enclosed by the open end frame of the first-layer truncated cone frame (51) is larger than the circular area enclosed by the tail end frame. The diameter of the circle enclosed by the open end frame is 1 m, the diameter of the circle enclosed by the tail end frame is 0.8 m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.5 m. The diamond mesh bag that wraps the first-layer truncated cone frame (51) has a mesh size of 50 mm, the number of meshes around the open end is 81, the number of meshes around the tail end is 65, and the number of meshes in the longitudinal direction is 16. The second-layer truncated cone frame (52) is welded by a stainless steel pipe with a diameter of 6 mm. The diameter of the circle enclosed by the open end frame is 0.8 m, the diameter of the circle enclosed by the tail end frame is 0.6 m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.5 m.
8. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The third-layer truncated cone frame (53) is welded with a stainless steel pipe with a diameter of 6 mm. The diameter of the circle surrounded by the open end frame is 0.8 m, the diameter of the circle surrounded by the tail end frame is 0.7 m, the distance between the center point of the open end frame and the center point of the tail end frame is 0.25 m, and the diamond mesh bag wrapping the third-layer truncated cone frame (53) has a mesh size of 35 mm, the number of meshes around the open end is 138, the number of meshes around the tail end is 81, and the number of meshes in the longitudinal direction is 58.
9. The net bag for increasing the survival rate of fish landing according to claim 1, characterized in that: The fourth-layer truncated cone frame (54) is welded from a stainless steel pipe with a diameter of 6 mm. The diameter of the circle surrounded by the open end frame is 0.7 m, the diameter of the circle surrounded by the tail end frame is 0.6 m, and the distance between the center point of the open end frame and the center point of the tail end frame is 0.25 m.
Citation Information
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