Dragon tongue fish, also known as pedal fish, belongs to the order sole, order sole and order sole, commonly known as grouper, sole fish and sole rice; It is a large benthic fish in warm coastal waters. It lives in the offshore of China all the year round, with a wide range of temperature and salt, and adapts to the changes of environmental conditions. The suitable temperature range is 3.5-32℃, the optimum water temperature is 14-24℃, and the suitable salt range is 14-33‰. Cynoglossus semilaevis has few natural resources, delicious taste, high meat yield, smooth taste, no aging after long cooking, no fishy smell, high protein and rich nutrition. It has always been the first-class product of domestic coastal consumers and is favored by consumers. The price of live fish is very high at present. In addition, Cynoglossus semilaevis has the advantages of fast growth, low feeding level, hypoxia tolerance and less diseases, and is suitable for breeding turbot and flounder in greenhouse at present.