Middle-layer trawl net and fish bag selective device

Abstract

A middle-layer trawl net and fish bag selective device comprises rigid round rings, a conical separating net, lacing ropes and a conical connecting net. The middle-layer trawl net and fish bag selective device is characterized in that the conical separating net is provided with square mesh, the large end of the conical separating net is fixed to one rigid round ring which is connected with a body net, the small end of the conical separating net is connected with the other rigid round ring with the diameter half that of the rigid round ring at the large end of the conical separating net, the rigid round ring at the small end of the conical separating net is connected with the small end of the conical connecting net, the large end of the conical connecting net is connected with a fish bag, the mesh of the conical connecting net is the same as that of the fish bag, the four lacing ropes are evenly distributed between the body net and the fish bag for connection, and the length of the lacing ropes is equal to the sum of the longitudinal sheepshank length of the conical separating net and the longitudinal sheepshank length of the conical connecting net. The middle-layer trawl net and fish bag selective device solves the problem that an existing selective device structure has a large influence on the performance of fishing nets, and is suitable for application and popularization.

Description

technical field [0001] The invention relates to a selective device for midwater trawl. Background technique [0002] The development of eco-friendly nets has always been one of the hot topics in fishery research at home and abroad in recent years. Appropriately increasing the mesh of the bag net or installing selective devices is the main method of optimizing the nets currently used. There have been reports in the 1990s, but today, it is rarely installed and used in the offshore trawl fishery. In addition to the factors that the offshore fishery does not require installation, the selective device structure currently developed has a greater impact on the performance of the net gear. one of the reasons. Contents of the invention [0003] What the present invention needs to solve is to provide a mid-level trawl net selection device, which can improve the selection performance of the net gear, reduce the bycatch of juvenile fish, and at the same time minimize the impact on th...

AI Technical Summary

Problems solved by technology

[0002] The development of eco-friendly net gear has always been one of the hot topics in fishery research at home and abroad in recent years. Appropriately increasing the mesh of the bag net or installing selective devices are currently the main methods for optimizing net gear. There have been reports in the 1990s, but today, it is rarely installed and used in the offshore trawl fishery. In addition to the factors that the offshore fishery does not require installation, the selective device structure currently developed has a greater impact on the performance of the net gear. one of the reasons

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