The freshwater somen is a class of fish under the family of Romeridae, and the South China Sea is a major source of freshwater somen, which is a valuable freshwater farmed marine fish. The fish is laterally compressed, with a high dorsal fin, long pectoral fins, lime green body color, creamy white belly, greenish-gray vertical lines on the side of the body, preferring high temperature and tolerating low oxygen, and its survival temperature ranges from 7 degrees Celsius to 35 degrees Celsius, with a salinity of three degrees of seawater as well as freshwater are able to live.

The freshwater sauger is an omnivore, adult freshwater sauger likes to eat some plankton and benthic organisms, its ability to snatch food is relatively strong, the growth rate is faster. The growth rate of male freshwater sauger is greater than that of female freshwater sauger, and the period of sexual maturity is usually two to three years.