Among the types of fish, freshwater fish are common: carp, crucian carp, silver carp, eel, mandarin fish, herring, grass carp, whitebait, saury, whitebait, etc. Marine fish include: yellow croaker (stone head needle), pomfret, shark, barracuda, herring, sea catfish, hairtail, cuttlefish, pomfret, flounder and so on.

Fish plays an important role in aquatic products.

The fiber tissue of fish is soft, and the water content is about 70% ~ 80%. After conditioning, the water loss is only10% ~ 35%, which is less than that of domestic animals. The nutritional composition of fish is similar to that of domestic animals and poultry, and marine fish is an important source of iodine for human body.