The trawling operation is flexible, highly adaptable, and has high production efficiency. Modern trawl gears can be used not only for catching fish, but also for cephalopods, shellfish and crustaceans; not only can they be used for fishing objects with a depth of only a few meters or tens of meters, but they can also be used for fishing to a depth of several meters Kilometers of deep sea species.
In modern fishing gear and fishing methods, trawling is a very energy-intensive operation, and it is highly dependent on energy, which causes the operating cost to continue to rise and the efficiency to decline. This efficient fishing has put tremendous pressure on marine fishery resources. Since the 1970s, the decline of marine fishery resources has largely been caused by modern trawl fisheries, and the concept of responsible fishing has been proposed worldwide, and there has been a consistent demand for limiting and reducing industrial trawling.
Trawling operations not only cause huge damage to the fish resources themselves, but also cause great damage to the marine ecological environment where fish depend on them, especially bottom trawling.