There are about 20,000 kinds of fish in the world. Among them, there are about 73 species of rotifer, about 800 species of cartilaginous fishes and about 20,000 species of bony fishes. There are about 3000 species of fish in China. Among them, there are about 2 100 species of marine fish. Freshwater fish 10 10 or so common freshwater fish species! China is rich in freshwater fish resources, coupled with artificial breeding, and the market supply is sufficient. Among them, carp, silver carp, grass carp and herring are the most common, in addition to eel and catfish. Carp is a kind of good freshwater fish, with white scales and metallic luster, red tail, tender meat and fresh taste. The Yellow River carp is particularly popular. Grass carp, also known as grass green, is yellowish brown in color and is one of the most productive freshwater fish. This kind of fish is characterized by fast growth, large weight and fat head, but its meat quality is coarse, which is inferior to that of carp. Silver carp can be divided into silver carp and silver carp (commonly known as chubby fish). Silver carp is pale in color, with small scales, large head, fat meat, delicious taste and the fattest head, which is especially suitable for making casserole fish heads. Carassius auratus, also known as Carassius auratus, is flat and wide in shape, with obvious hump on the back and small scales. It is characterized by tender meat and great flavor, but with many small thorns. Carassius auratus is the most suitable for boiling soup. Small crucian carp is suitable for crispy fish. Black herring, also known as black fin, is cylindrical in length, black in the spine, milky white in the belly, white and full in meat, and is a kind of delicate meat in freshwater fish; It contains a lot of fat, especially the pectoral fin and the head and tail. The lung of herring is the most tender part of the fish and contains a lot of fat. The famous dish "Burning Bald Lung" is made of herring's lung, which is delicious when cooked well and eaten hot. Eel, also known as long fish and eel, is long and thin, with thick head and thin tail, dark brown back, yellow belly and small eyes without scales. This kind of fish is extremely delicate and delicious, and is regarded as the best fish. Catfish, also known as turtle fish, is a high-grade tonic with tender meat and rich nutrition. Ornamental fish refer to those fish with bright colors or strange shapes with ornamental value. There are usually three major strains, namely, temperate freshwater ornamental fish, tropical freshwater ornamental fish and tropical seawater ornamental fish. The freshwater ornamental fish in temperate zone mainly include red crucian carp, China goldfish and japanese koi. There are three series of tropical freshwater ornamental fish, one is lamp species, the other is angelfish and the third is arowana. Seawater ornamental fish mainly come from coral reef waters in the Indian Ocean and the Pacific Ocean, with many varieties and strange sports colors, and have a primitive and mysterious natural beauty. etc