The freshwater grouper (Cichlasoma managuense) is native to Nicaragua, Central America, and was introduced into Taiwan in 1988, and is a common freshwater culture species in the southern part of Taiwan, and was introduced from Taiwan by the Guangdong and Jiangxi culture units in 1996, and was introduced into the Freshwater Aquaculture Scientific Research Institute of Jinan City in 1999. Freshwater grouper with its fast growth rate, low oxygen tolerance, strong disease resistance, and beautiful appearance, delicious meat, rich in nutrients, can be used as both commercial fish and ornamental fish species, which is a species worth promoting. All along, the research of freshwater grouper culture technology has attracted the attention of domestic aquatic workers, and the scale of freshwater grouper culture is also getting bigger and bigger, which has become a kind of new freshwater culture species. In the Minjiang River system in the west of China, the Yangtze River tributaries and other rivers also have a kind of native grouper, with relatively small size, adult body length of about 18~~25CM, weight between 100~~250g, due to its year-round life in freshwater to nibble on plankton and insect aquatic larvae attached to the stone wall for food and so named. Its growth rate is slow, but it is resistant to low oxygen, strong disease resistance, and beautiful appearance, delicious meat, rich in nutrients, both as commercial fish, but also as ornamental fish species.