Device and method for actively stimulating juvenile fishes to escape

Abstract

The invention relates to a device and a method for actively stimulating juvenile fishes to escape. The device can be applied to sac-type fishing gears such as a trawl and a trap net, and comprises a cylindrical cod-end consisting of a front rope loop, a funnel net, a rope loop, a square mesh section, a rear rope loop and meshes, wherein the cylindrical cod-end is connected onto a net body to form the whole trawl. The device is characterized by further comprising a luminous circular ring arranged in the middle of the cod-end, four fixing holes are formed in the inner periphery of the luminous circular ring and connected with the rope loop through four cords, and the horizontal distance between the rope loop and the luminous circular ring ranges from 20cm to 30cm. In order to further drive the juvenile fishes, a conical rope array comprising at least three hollow small bells and a plurality of ropes is arranged on the periphery of the luminous circular ring. Obviously, the juvenile fishes can be actively stimulated to escape the trawl, juvenile fish resources can be protected, and the device is simple in structure, easy to manufacture and low in material cost.

Description

technical field [0001] The invention belongs to a fishing gear device, in particular to a device and method for actively stimulating juvenile fish to escape. Background technique [0002] Trawl net is a kind of mobile filtering fishing gear, relying on the power of fishing boats to tow pouch-shaped fishing gear, and forcibly drag fish, shrimp, crab, shellfish or molluscs into the net in the waters it passes through, so as to achieve the purpose of fishing production. At present, trawling plays an important role in my country's marine fishing industry, and its output accounts for 49% of the total marine fishing, about 6.1 million tons per year. At present, the biggest problem of trawl fishery is the bycatch of a large number of juveniles of economic fish in its catch, which destroys the fish population structure and seriously affects the sustainable development of fishery resources. In many shrimp trawl fisheries around the world, some technical measures and management measu...

AI Technical Summary

Problems solved by technology

Existing at present belongs to the passive separation device, on the one hand requires high net gear assembly technology, easily affects the shape of the net bag during application, thereby affecting the performance and effect of the net gear itself and the selective device; The separation device is crushed and injured, even if it escapes, its survival rate is low

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