在我国海洋渔业中,机轮底拖网是主要渔具,其捕捞对象以近海底层鱼类为主.由于作业方式较单一,近海底层鱼类资源受到破坏,而中上层鱼类如鯷、鲱、鲐、沙丁鱼等及东黄海的主要捕捞对象如马面纯、带鱼、乌贼等具有垂直洄游或栖息水层变动的习性,而中上层鱼类资源尚未得到充分开发利用. In China’s marine fisheries, the bottom trawling machine is the main fishing gear, the main object of its fishing to the offshore bottom of the fish-based.As a result of a single mode of operation, offshore bottom layer of fish resources are damaged, and pelagic fish such as sparrow, herring, , Sardines, etc. and the main fishing targets of the East Yellow Sea, such as horse-faced pure fish, octopus, and squid, have the habit of vertically migrating or habitat aquifers, while the pelagic fish resources have not yet been fully exploited.