How do fishing nets catch fish? What is the principle? What are the classifications? It's better to introduce it in detail, I can't find the answer!

There is lead in the fishing net. When casting a net, the net scattered and fell into the water. Because the lead is heavy, it goes straight down, so the fish is put in.

Fishing nets are divided into gill nets, trawls, purse seines, netting and laying nets according to their functions. It requires high transparency (partial nylon mesh) and strength, good impact resistance, wear resistance, mesh size stability and softness, and appropriate elongation at break (22% ~ 25%). It is made of monofilament, multifilament twisted yarn (with mesh) or monofilament through weaving (Raschel), primary heat treatment (fixing nodules), dyeing and secondary heat treatment (fixing mesh size).

Extended data

Ancient people used coarse cloth and hemp as raw materials to make fishing nets by binding. Although this kind of fishing net is rotten and tough, its fishing efficiency has been greatly improved. With the development of fishery, the object of fishing and hunting is not only fish, but also fishing tools keep pace with the times. Modern fishing nets are mainly made of polyethylene, nylon and other raw materials.

The service life is longer, the fishing efficiency is higher, and it can be classified according to different use modes. For example, traditional fishing nets (hand nets, hand nets), trawls powered by ships, gill nets (triple nets, purse seines) with different meshes used to catch trapped fish, etc.

These nets are woven with different mesh sizes and different materials according to different fishing objects. At the same time, with the development of fishing nets, various fishing tools came into being, such as fishing net cages and four-corner nets, which are commonly used fishing tools.