A nested detachable catch separation trawl mesh bag and its operation method

Abstract

The invention discloses a nested detachable trawl net bag and an operation method for separating catches, including a fixed frame, a connecting frame 1, a locking device 1, a large mesh bag and a guide ring, etc.; the design of the mesh bag in the present invention Form multiple nested mesh pockets, and the mesh size of each mesh pocket is different; the mesh size of the innermost mesh pocket is the largest, and the mesh wire is the thickest; thus, the mesh size of the mesh pockets is sequentially reduced from the inside to the outside , reduce the wire diameter; the mesh size of the outermost net bag is the smallest, and the wire is the thinnest; in this way, the separation of different catch sizes can be reasonably realized, and the sorting work of the staff is alleviated; when falling off in the present invention It starts to fall off from the outermost layer. Because the outermost layer is the thinnest net wire, most of the fish are loaded with smaller fish. The tolerance of small-sized fish is lower than that of large-sized fish, and they are more likely to die. , and the survival ability of large fish is relatively strong, and this shedding sequence is also in line with this rule, reducing fish death.

Description

technical field [0001] The invention relates to the field of marine fishery equipment, in particular to a trawling net bag with a nested separation type and a detachable trawling net bag and an operation method. Background technique [0002] The working principle of trawling is to drag the bag-type fishing net by the ship to carry out fishing in the sea area it passes through; there is a problem with trawling, that is, the long-term dragging of the trawling will increase the burden on the net bag and cause damage to the net bag. The fish is squeezed and damaged, causing the fish to be injured or killed; Song Weihua had two patents in 2015, namely "trawl net with parallel multiple groups of sacks and its fishing method (patent number CN201310407977)" and " A trawling net with a series of multiple sets of bladders and its fishing method (Patent No. CN201310407953)", using multiple bladders to fall off in sequence to reduce the dragging time of each net bag to alleviate this pr...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a nested separation catch that can fall off the trawl net bag and its working method, to solve the problem that the catch that enters the trawl net in the above-mentioned background technology is not well differentiated, that is, where the trawl passes. Fish, shrimp and crabs, no matter how big or small, are usually dragged into the net bag

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