Shrimp trawl selective device

Abstract

The invention provides a shrimp trawl selective device which comprises a drum net cover, a guide net, a transverse separation grid, a longitudinal separation grid, an escape opening, a square mesh netbody, a net bag and a longitudinal force line. The tail end of the drum net cover is connected with the net bag, and the square mesh net body is further connected between the drum net coat and the net bag, and the square mesh net body is a node-free square mesh net cover, a square-mesh escape window is formed in the back of the net body; the drum net coat, the square-mesh net body, the longitudinal force line is arranged on the two sides of the net bag, and the longitudinal force line is an ethylene fiber rope. The guide net is located inside the drum net coat and is in a funnel shape with alarge end and a small end, and the large end of the guide net is sewed with the inlet end of the drum net coat, and a transverse separation grid is arranged at the abdomen of the drum net coat corresponding to the small end of the guide net, a longitudinal separation grid is arranged at the outlet end of the drum net coat, and an escape opening is formed in the drum net coat. According to the method and the device disclosed by the invention, the intra-species and inter-species separation of the byproduct can be realized.

Description

technical field [0001] The invention relates to the field of fishing gear, in particular to a selective device for a shrimp trawl. Background technique [0002] With the decline of traditional high-quality fish resources, the utilization value of crustacean resources represented by shrimp has been paid more and more attention. At the same time, compared with fish, shrimp has a short life cycle and can withstand greater fishing pressure. Shrimp trawls are the most efficient fishing gear for catching shrimp resources. However, since shrimp individuals are generally small and are mainly distributed in inshore fisheries where a variety of fishery resources are mixed, this leads to the inevitable large number of non-target species other than shrimps (also known as bycatch ). Especially in shrimp trawls distributed in tropical and subtropical waters, the problem of bycatch and discarding is the most serious. For example, shrimp trawl catches in the South China Sea include fish...

AI Technical Summary

Problems solved by technology

For example, the invention patent with application number 200710116337.9 provides an adjustable trawl fish and shrimp separation device, which only separates fish and shrimp by passing through the separation grid; The device, and the shrimp trawl selective device with a hexagonal mesh structure disclosed in the application number 201010130062.6, all from the perspective of protecting fishery resources, effectively prevent the damage to fish and shrimp, but still fail to solve the problem of fish and shrimp. The problem of intra-species and inter-species selection; the application number is 200920067115.7, and the mesh type fish and shrimp separator of the truss trawl is also mainly achieved by the mesh design to separate the catches, and the separation effect is not ideal.

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