It is a genus of round abdomen (fish awn) and the common name of Su's round abdomen (fish awn). It is called "freshwater shark" because it looks like a shark, but it has nothing to do with real sharks. Also known as tiger shark, Bating fish or Bazhen fish, they are mainly distributed in Southeast Asia, with three body colors of black, white and gray, and grow in different river systems and marine systems. Black shark is called freshwater black shark, originally from Thailand, and was introduced to China in 1978. The white one is called freshwater white shark, which is native to Malaysia and was introduced to China on 1998. The grey one is called Malaya River grey shark, which has good meat quality and was introduced to China in 2000.

Freshwater sharks live in benthic organisms and belong to omnivorous fish. Young fish feed on zooplankton and artificial feed, while adult fish feed on aquatic plants and artificial feed. This kind of fish is very gluttonous, so it grows fast, is big and has strong adaptability to the environment. It can be cultured in rivers and ponds, and it can gain weight 1 kg after 8 months. Fish are timid and swim fast. When disturbed, they keep jumping in the water. The fish has poor low-temperature resistance, the optimum temperature is 20℃-30℃, and the optimum growth temperature is 24℃-28℃. When the water temperature dropped to 18℃, the food intake and activity decreased obviously, and the water temperature continued to fall below 12℃ and began to die. The ph value of the growing water is 6-7.2. Adaptability and feeding habits. Freshwater sharks have strong tolerance to hypoxia and a wide range of adaptation, but weak tolerance to low temperature. The optimum temperature is 20℃ ~ 34℃, and the optimum growth water temperature is 26℃ ~ 32℃. When the water temperature is lower than 18℃, the activity is slow and the response is slow. Death began when the water temperature was lower than 65438 02℃. This kind of fish has all kinds of food. Young fish feed on zooplankton, while adult fish feed on aquatic plants and artificial compound feed. Protein requirement of feed is 28% ~ 32%.