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According to the regulations of China's fishery department, fishermen should use fishing nets with a diameter greater than 39 mm, but fishermen in China generally use fishing nets with a diameter less than 1 cm. This kind of fishing net is called "sweeping net" and "homeless net". It not only has a very small mesh, but also sinks deeper and deeper after entering the water, forming a straight line, which can "sweep" the passing sea surface with the movement of fishing boats like a broom.

Fish and shrimp have a sad habit, that is, as soon as they touch the net, they will always move sideways. Homeless web is also called maze. The net is fixed in the water and is a trap for fish and shrimp. As long as the fish enters the array of straight nets, they can't get out. This ecstasy is widely used in inland freshwater lakes and along the Yangtze River.

"The fishing net holes we use are very small, so we want to catch more." Boss Chen said and drew a circle the size of a one-dollar coin with his hand. This is the local fishing net commonly known as "sweeping the floor". Reporters often see "sweeping the floor" at the dock. It not only has a very small mesh, but also sinks deeper and deeper after entering the water, forming a straight line and "sweeping" the passing sea area with the movement of fishing boats like a broom. Because even small fish two or three centimeters long can be caught, it also has a more explicit name-Juejun. com。

China's per capita marine land area ranks 122 among the marine countries in the world, while China's per capita fishery resources are less than 30% of the world level, and China's marine resources cannot be called rich. Moreover, in the seemingly vast sea, there are actually not many areas where fish can be caught: because there are few nutrients in the deep sea, it is difficult for sunlight to penetrate, and most fish schools gather near the continental shelf. At present, more than 80% of the global catch comes from the continental shelf with water depth less than180m. After the adoption of the United Nations Convention on the Law of the Sea, coastal countries have successively extended the baseline of their territorial sea width to 200 nautical miles as exclusive economic zones, and 94% of the world's marine fishing has been included in the exclusive economic zones of all countries, and there are not many fish that can be caught on the high seas.