How does a fishing net catch fish?

The fishing net is a round net with a lead pendant around the edge. When the net is thrown down, because the edge is heavy and sinks fast, the fish in the middle can't swim out in time and are covered under the net. Tighten the rope, so that the edge of the net will tighten into a pocket mouth, a pull mouth upward tighten to put out on the line.

Ancient people used coarse cloth and hemp as raw materials to make fishing nets by bundling and rolling. Although this kind of fishing net is easy to rot, toughness is poor, but its fishing efficiency has been greatly improved. With the development of fisheries, the object of fishing and hunting is not only fish, fishing tools have also advanced with the times. Modern fishing nets are mainly processed with polyethylene, nylon and other raw materials. It has a longer life cycle, and higher fishing efficiency, through different ways of use for classification.

For example, cast nets (hand nets, hand cast nets) are traditionally used for fishing, trawls are powered by boats, and drift nets (triple nets, purse seines) are used to trap fish by hanging gills with different meshes. These nets are made with different sizes of mesh and different materials of netting for different fishing targets. The development of fishing nets has also led to the creation of a variety of fishing gear, such as fishing cages and trammel nets, which are commonly used as fishing tools.

Expanded Information

Fishing nets are functionally categorized as gillnets, trawls, purse seines, building nets, and laying nets. Requirements are high transparency (some nylon nets) and strength, good impact resistance, abrasion resistance, mesh size stability and softness, appropriate elongation at break (22% to 25%).

Processed from monofilament, compound twisted wire (knotted mesh) or monofilament by braiding (raschel, which is a non-knotted mesh), primary heat treatment (to fix knots), dyeing and secondary heat treatment (to fix mesh size). It can be used for driftnet fishing, trawl fishing, fish trawling, bait fishing and set fishing. It can also be used as a raw material for the production of nets, fishing cages and other catching products.