Selective fishing device and method for jellyfish

Abstract

The invention relates to a jellyfish selective fishing device and a fishing method, and solves the problem that a targeted jellyfish resource fixed-point fishing detection netting gear is lacked in marine aquatic product research. The device comprises a vertical main pipe, extending arms are arranged at the top end of the main pipe in a circumferential radial extending mode, each extending arm is formed by sequentially hinging a plurality of sections of extending arms end to end, umbrella-shaped fishing nets are arranged among the extending arms, a main air bag is arranged at the top of the main pipe in a hanging mode, and auxiliary air bags are arranged at the outer ends of the sections of extending arms. A heavy weight is arranged at the bottom end of the main pipe, a net drawing rope is arranged on the extending arm, and the net drawing rope sequentially extends outwards along the extending arms from inside to outside, extends to the lower end of the main pipe from the outer end of the outermost extending arm, penetrates through the interior of the main pipe and penetrates out of the upper end of the main pipe. According to the method, a skynet type sinking fishing mode is adopted, jellyfishes on the upper layer and the lower layer are fished in one net, other fished objects with high swim speed can be driven in the process, and interference factors are eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of marine fisheries and relates to a jellyfish catching device, in particular to a jellyfish selective catching device and a catching method. Background Art

[0002] At present, the production of jellyfish along the coast of Zhejiang Province is declining year by year. Marine fishery researchers are studying the growth and reproduction of jellyfish and continuously monitoring jellyfish resources. In the current monitoring process of jellyfish resources, there is no corresponding monitoring net to collect jellyfish samples at fixed points to achieve the purpose of monitoring jellyfish resources. Because the jellyfish individuals are small after being released for a period of time, it is impossible to use jellyfish nets for monitoring; in addition, the presence of other catches will also affect the accuracy of jellyfish monitoring data. At present, there is a lack of corresponding monitoring nets in the monitoring process of jellyfish resources. It is of great practical significance to design a selective monitoring net suitable for jellyfish resources.

[0003] The movement of jellyfish mainly depends on the rhythmic relaxation and contraction of the circular muscles of the inner umbrella. When the circular muscles contract, the seawater in the lower cavity of the umbrella is squeezed out, and the reaction force generated is used to push the sting toward the top of the umbrella. The movement of jellyfish continues day and night, and the swimming speed of adults in still water is 4 meters per minute to 5 meters per minute. Since jellyfish have weak swimming ability, strong winds, tides and ocean currents have a certain impact on their horizontal distribution. However, jellyfish have a developed water pipe system and sensitive sensory organs, so they can move vertically in different water layers. They often swim to the upper layer of the water at dawn and dusk when the wind is calm, and during cloudy days; they swim to the lower layer of the water in strong winds, heavy rains, rapids, scorching sun and at night. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of lack of targeted jellyfish resource fixed-point fishing detection nets in marine fishery research, and to provide a jellyfish selective fishing device and a fishing method. According to the movement characteristics of jellyfish, a skynet-type fishing net that slowly descends from the sea surface to the seabed is set to carry out fixed-point fishing of jellyfish, and other fish with faster movement speeds are driven away during the fishing project, so as to eliminate more interference factors as much as possible, and facilitate the fixed-point fishing detection research of jellyfish resources.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a jellyfish selective fishing device comprises a vertical main pipe, the top of the main pipe is provided with a projection arm extending radially outward in a circumferential manner, the projection arm is formed by a plurality of expansion arms hinged end to end in sequence, an umbrella-shaped fishing net is arranged between the expansion arms, a main air bag is suspended from the top of the main pipe, an auxiliary air bag is arranged at the outer end of each expansion arm, the main air bag and the auxiliary air bag are connected with an inflation and deflation air pipe, a weight is arranged at the bottom end of the main pipe, a net collecting rope is arranged on the expansion arm, the net collecting rope starts from the inner end of the innermost expansion arm of the expansion arm, extends outward along each expansion arm from the inside to the outside in sequence, extends from the outer end of the outermost expansion arm to the lower end of the main pipe, passes through the inside of the main pipe and passes out from the upper end of the main pipe and extends as an operating end; a jellyfish trapping light is arranged at the upper end of the main pipe below the expansion arm.

[0006] This device utilizes a multi-jointed extending arm, and under the action of the air bag buoyancy or the net-collecting rope, the fishing net can be unfolded or retracted. This device adopts a skynet-style sinking fishing method. In view of the characteristics that jellyfish move slowly and basically move vertically in still water, the jellyfish in the upper and lower layers can be caught in one net. In the process, other fast-swimming fish can be driven away, eliminating interference factors. This device is particularly suitable for the selective fishing of jellyfish in marine fishery research.

[0007] Preferably, the main pipe is a double-layer pipe, an inner pipe is arranged inside the main pipe, the net collecting rope passes through the inner pipe, a bait interlayer is arranged between the inner wall of the main pipe and the outer wall of the inner pipe, and bait discharge holes are evenly opened on the pipe wall of the main pipe.

[0008] Preferably, a limited rotation joint is provided between adjacent arms, and the arms are limited by the limited rotation joint: the adjacent arms swing to a maximum angle of 180 degrees, and the adjacent arms swing to a minimum angle of 90 to 120 degrees.

[0009] Preferably, the innermost arm is hinged to the top of the main pipe, and a limited rotation joint is provided at the hinge.

[0010] Preferably, the expansion arm is provided with three sections, namely the first expansion arm, the second expansion arm and the third expansion arm from the inside to the outside, the minimum swing angle of adjacent expansion arms is 120 degrees, the maximum swing angle between the first expansion arm and the top of the main pipe is 90 degrees, and the minimum angle is 60 degrees.

[0011] A jellyfish selective fishing method, using the above-mentioned jellyfish selective fishing device, comprises the following steps: S1, selecting a spot for fixed-point fishing, turning on the jellyfish trapping light of the fishing device, and throwing the fishing device into the sea after selecting the fishing spot; S2, inflate the main airbag and the auxiliary airbag from the inflation and deflation air pipe, use the buoyancy of the main airbag and the auxiliary airbag to make the fishing device float on the sea surface, and make each section of the boom unfold horizontally to open the fishing net; S3, after a period of time, the main airbag and the auxiliary airbag are deflated, causing the fishing device to slowly sink under its own weight and the weight. During the sinking process, due to the lift of the sea water, the fishing net remains in an unfolded state, while the faster-swimming catch is driven out of the fishing net; S4, the fishing device sinks to the seabed, and the net-collecting rope is manually pulled to make each section of the boom swing inwards until it closes; S5, continue to pull the net rope, keep the fishing device in a closed state and pull the net upward for jellyfish sampling research.

[0012] Preferably, in S2 and S3, the bait in the bait interlayer is mixed with seawater and overflows from the bait outlet to attract and gather jellyfish.

[0013] The present invention adopts a skynet-type sinking fishing method. According to the characteristics that jellyfish in still water move slowly and basically move vertically, the jellyfish in the upper and lower layers are caught in one net. In the process, other fast-swimming fish can be driven away to eliminate interference factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a diagram of the expanded structure of a fishing device of the present invention.

[0016] Figure 2 It is a structural diagram of a fishing device folded up according to the present invention.

[0017] Figure 3 The present invention Figure 1 AA schematic diagram in .

[0018] Figure 4 The present invention Figure 1 Enlarged view of point B in .

[0019] In the figure: 1. seabed, 2. sea surface, 3. main pipe, 4. bait outlet hole, 5. bait interlayer, 6. inner pipe, 7. net-collecting rope, 8. main air bag, 9. auxiliary air bag, 10. inflation and deflation pipe, 11. first extension arm, 12. second extension arm, 13. third extension arm, 14. limit rotation joint, 15. jellyfish trapping light, 16. fishing net, 17. weight. DETAILED DESCRIPTION

[0020] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0021] Embodiment: A jellyfish selective fishing device, such as Figure 1 , 3, 4. The device comprises a vertical main pipe 3, the top of the main pipe 3 is provided with an extension arm extending radially outwards, the extension arm is formed by hingedly connecting multiple sections of the extension arm end to end, and an umbrella-shaped fishing net 16 is arranged between the extension arms. The extension arm is provided with three sections, which are the first extension arm 11, the second extension arm 12, and the third extension arm 13 from the inside to the outside, and a limited rotation joint 14 is provided between adjacent extension arms. The first extension arm 11 is hinged with the top of the main pipe 3, and a limited rotation joint 14 is provided at the hinge. The maximum angle of swinging of adjacent extension arms is 180 degrees, and the minimum angle of swinging of adjacent extension arms is 120 degrees. The maximum angle of swinging between the first extension arm 11 and the top of the main pipe is 90 degrees, and the minimum angle is 60 degrees.

[0022] A main airbag 8 is suspended from the top of the main pipe 3, and auxiliary airbags 9 are arranged at the outer ends of each section of the arm. The main airbag and the auxiliary airbag are connected with an inflation and deflation air pipe 10, and a weight 17 is arranged at the bottom end of the main pipe.

[0023] The extending arm is provided with a net collecting rope 7, which starts from the inner end of the first extension arm 11 of the extending arm, extends outward along each section of the extension arm from the inside to the outside, extends from the outer end of the third extension arm 13 to the lower end of the main pipe 3, passes through the inside of the main pipe 3, and passes out from the upper end of the main pipe and extends as an operating end. The main pipe 3 is a double-layer pipe, and an inner pipe 6 is also provided on the inner side of the main pipe. The net collecting rope 7 passes through the inner pipe 6. A bait interlayer 5 is provided between the inner wall of the main pipe 3 and the outer wall of the inner pipe 6, and bait discharge holes 4 are evenly opened on the pipe wall of the main pipe. A jellyfish trapping light 15 is provided at the upper end of the main pipe 3 below the extending arm.

[0024] The fishing method using the above jellyfish selective fishing device is as follows: S1, select a spot for fixed-point fishing, turn on the jellyfish trapping light 15 of the fishing device, and throw the fishing device into the sea surface 2 after selecting the fishing spot; S2, inflate the main airbag 8 and the auxiliary airbag 9 from the inflation and deflation pipe 10, use the buoyancy of the main airbag and the auxiliary airbag to make the fishing device float on the sea surface, and make each section of the arm spread horizontally, and open the fishing net 16; at this time, the bait in the bait interlayer 5 is mixed with seawater and overflows from the bait outlet 4 to attract and gather jellyfish; S3, after a period of time, the main airbag 8 and the auxiliary airbag 9 are deflated, so that the fishing device slowly sinks under the action of its own weight and the weight 17. During the sinking process, due to the lift of the sea water, the fishing net 16 remains in the unfolded state, and the faster-swimming catch is driven out of the fishing net range; S4, the fishing device sinks to the seabed 1, and the net-collecting rope 7 is manually pulled to make each section of the boom swing inwards until it closes; S5, continue to pull the net rope 7, keep the fishing device in a closed state and pull up the net for sampling and research of jellyfish.

Claims

1. A jellyfish selective fishing device, Features: The utility model comprises a vertical main pipe, the top of which is provided with an extension arm which radially extends outward in a circumferential manner, the extension arm is formed by hingedly connecting a plurality of extension arms end to end in sequence, an umbrella-shaped fishing net is arranged between the extension arms, a main air bag is suspended from the top of the main pipe, an auxiliary air bag is arranged at the outer end of each extension arm, the main air bag and the auxiliary air bag are connected with an inflation and deflation air pipe, a weight is arranged at the bottom end of the main pipe, a net collecting rope is arranged on the extension arm, the net collecting rope starts from the inner end of the innermost extension arm of the extension arm, extends outward along each extension arm from the inside to the outside in sequence, extends from the outer end of the outermost extension arm to the lower end of the main pipe, passes through the inside of the main pipe and passes out from the upper end of the main pipe and extends as an operating end; a jellyfish trapping light is arranged at the upper end of the main pipe below the extension arm.

2. A jellyfish selective fishing device according to claim 1, Features: The main pipe is a double-layer pipe, an inner pipe is arranged inside the main pipe, the net collecting rope passes through the inner pipe, a bait interlayer is arranged between the inner wall of the main pipe and the outer wall of the inner pipe, and bait discharge holes are evenly opened on the pipe wall of the main pipe.

3. A jellyfish selective fishing device according to claim 1, Features: A limited rotation joint is arranged between adjacent arms, and the arms are limited by the limited rotation joint: the adjacent arms swing to a maximum angle of 180 degrees, and the adjacent arms swing to a minimum angle of 90 to 120 degrees.

4. A jellyfish selective fishing device according to claim 1 or 3, Features: The innermost arm is hinged to the top of the main pipe, and a limited rotation joint is arranged at the hinge.

5. A jellyfish selective fishing device according to claim 4, Features: The expansion arm is provided with three sections, namely the first expansion arm, the second expansion arm and the third expansion arm from the inside to the outside, the minimum swing angle of adjacent expansion arms is 120 degrees, the maximum swing angle between the first expansion arm and the top of the main pipe is 90 degrees, and the minimum swing angle is 60 degrees.

6. A method for selectively catching jellyfish, using the selective jellyfish catching device according to claim 1, Features: The following steps are included: S1, selecting a spot for fixed-point fishing, turning on the jellyfish trapping light of the fishing device, and throwing the fishing device into the sea after selecting the fishing spot; S2, inflate the main airbag and the auxiliary airbag from the inflation and deflation air pipe, use the buoyancy of the main airbag and the auxiliary airbag to make the fishing device float on the sea surface, and make each section of the boom unfold horizontally to open the fishing net; S3, after a period of time, the main airbag and the auxiliary airbag are deflated, causing the fishing device to slowly sink under its own weight and the weight. During the sinking process, due to the lift of the sea water, the fishing net remains in an unfolded state, while the faster-swimming catch is driven out of the fishing net; S4, the fishing device sinks to the seabed, and the net-collecting rope is manually pulled to make each section of the boom swing inwards until it closes; S5, continue to pull the net rope, keep the fishing device in a closed state and pull the net upward for jellyfish sampling research.

7. A method for selectively catching jellyfish according to claim 6, Features: In S2 and S3, the bait in the bait interlayer is mixed with seawater and overflows from the bait outlet to attract and gather jellyfish.

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