The grouper (Channaargus) is a kind of fish belonging to the genus Channa, which is very common in China. It lives in still water or micro-water with aquatic plants and soft sediments, and is distributed in lakes, rivers, reservoirs, ponds and other waters.

Grouper has a strong adaptability to the changes of environmental factors in water, especially to hypoxia, water temperature changes and poor water quality.

The front part of the main body is cylindrical and the back part is flat; Generally, the body length is 25~40 cm; The head is long, the front part is slightly flat and the back part is slightly convex; The body color is gray-black, the back and top are darker, the abdomen is pale white, and there are irregular black patches on both sides.