Elastically-supported flexible trawling selection device

Abstract

The invention discloses an elastically-supported flexible trawling selection device. According to the invention, the problems of rigid trawling selection devices can be overcome, so that the trawling selection device can be well connected with the flexible webbing of a trawl net. The elastically-supported flexible trawling selection device comprises a rectangular frame, and isolating bars which are arranged between the upper and lower borders of the frame and are in parallel to the left and right borders of the frame. The elastically-supported flexible trawling selection device is characterized in that the rectangular frame is a supporting frame in which high-hardness springs are utilized as the upper, lower, left and right borders; elbows and the high-hardness springs are welded at the four corners of the frame; ultrahigh-strength low-extension long rope cores are arranged inside the high-hardness springs serving as the upper and lower borders and connected with the metal elbows at the two ends of the upper and lower borders; nylon corrugated hoses are sleeved outside the high-hardness springs serving as the four borders; the isolating bars are made of elastic tubes; each elastic tube consists of a high-hardness spring and a silicone rubber hose sleeved outside the spring; the positions of the elastic tubes are fixed through ultra-high molecular weight polyethylene ropes which are parallel to the upper and lower borders and connected with the left and right borders; and the two ends of the individual high-hardness springs of the elastic tubes are connected with the nylon corrugated hoses of the upper and lower borders through quick connectors. The device is applied to the selective trawling operation.

Description

technical field [0001] The invention relates to a selective fishing device for fish trawl fishing objects in fishing gear equipment. Background technique [0002] During the trawling operation, since the fishing grounds are mostly multi-species habitats, the catches are often mixed with a large number of juvenile fish. Therefore, in order to reduce the destructive intensity of fishing gear to resources, various fishing countries have carried out research on selective fishing gear and devices in order to release juvenile fish, retain adult fish, protect fishery resources, and achieve sustainable use of resources. [0003] Research on selective fishing gear and devices, on the one hand, studies the selectivity of net structure and mesh size to fishing objects, and on the other hand, studies the selectivity of selective devices to fishing objects. The research on mesh structure and mesh size mainly solves the problem of intra-species selection, while the selection between diff...

AI Technical Summary

Problems solved by technology

The disadvantage of the rigid device is that it is easy to form a phenomenon of stress concentration at the installation device, which makes the shape of the net gear deformed, affects the hydrodynamic performance of the net gear, and then affects the fishing effect of the net gear

In addition, the rigid device is impacted by the water flow during the trawling process, and it is easy to deform, which affects the separation effect and performance. At the same time, it also causes certain damage to the surface of the fish body, which affects the survival rate of the fish released through the device.

[0004] At present, a selective device using a rigid frame and flexible partition grids has been developed. However, only the degree of damage to the fish body has been improved, and the problem of stress concentration between the net gear and the selective device still exists and has not been effectively resolved.

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