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How Do Trawlers Work
Jul 26, 2018

Trawling can actively and flexibly tow the fishing group. Mainly used in the ocean, inland waters are also used. The fishing targets are mainly bottom and near-bottom fish, shrimp and mollusks, such as oysters, clams, octopus, horse lice, large yellow croaker, small yellow croaker, squid, calamari, clams, shrimps, crabs and Qinghai Lake in the land waters, naked knives, silver carp, white shrimp and so on. Trawling is one of the most important fishing methods in modern times.

Trawling can be divided into two types: sleeved trawl and sleeveless trawl.

Sleeve trawling generally has 1 net bag and 2 net sleeves. The nets are equipped with the appropriate number of floats and sinks to make the net opening vertically. It is the main structural form of ocean trawling, and inland waters are also used, but on a smaller scale.

Sleeveless trawls are available in sleeveless single-pocket and sleeveless multi-caps. Sleeveless single-bag trawling is a small trawling net. The mesh opening generally has a fixed bracket to keep the opening open, and both the marine and inland waters are used. Sleeveless multi-bag trawling, generally with more than 2 nets. The number of nets depends mainly on the ecological habits of the fishing objects and the tonnage of the fishing vessels. The horizontal and vertical opening of the mesh opening is ensured by means of two ship trawl spacing and vertical struts.

Sleeve and sleeveless trawls are generally used in the bottom waters, and the middle trawls are mainly used in the middle waters. The difference between it and the bottom trawl is mainly that the general meshless sleeve or the net sleeve is shorter, so that the resistance of the net can be reduced and the drag speed can be increased; the mesh mouth is slightly square or rectangular; the net has a sinker underneath, some A settling device such as a heavy hammer is also installed to enlarge the vertical opening dimension of the mesh opening and to maintain the position of the net in the water