Freshwater cage culture technology is a technology that uses synthetic fibers or metal nets as materials to assemble boxes with certain shapes and specifications suitable for fish farming, and then puts the cages in water suitable for fish farming. With the development of the times, cage fish culture has the characteristics of high yield, low cost, small investment, easy management, land saving, water saving and energy saving, which makes cage fish culture gradually become a new technology for intensive production of aquaculture in the world today.

Cage limits the fish's range of activities, greatly reduces the fish's activity, reduces its breathing frequency, slows down metabolism, thus reducing energy consumption, which is conducive to the transformation and accumulation of nutrients. The water inside and outside the cage can be freely exchanged, so the fish can get enough oxygen and natural bait, and the excrement will be taken out of the box with the current to keep the water fresh.