Fishing target: large and medium-sized predatory fish
Some fish (such as tuna) are very difficult to catch with fishing nets because they swim very fast, but they are very interested in moving small fish and shrimps. Fishermen use fishing methods to catch them for this characteristic.
Ordinary fishing methods use one or two hooks per fishing rod, which obviously cannot catch fish efficiently. Therefore, people invented the method of line fishing, which is to release a fishing line several kilometers long from the fishing boat. There are hundreds of fish hooks on the line, and hundreds of fish will be hooked at one time. Such a long fishing line cannot be dragged with human power. Generally, there are several sturdy stringers on this kind of ship. Each stringer can be tied with several lines. The fishing boat drags these lines to move slowly and sweep. Predatory fish mistakenly think that these baits are live small fish, they will be very excited to rush up to prey.
Longline fishing seems to be much more environmentally friendly than fishing nets. It only targets specific fish species and will not cause accidental injury to small fish, but often some seabirds will also peck at fish, so in some endangered birds In the living area, longline fishing is also strictly restricted.