Mugil cephalus, commonly known as roe and mullet, belongs to Spanish mackerel and can live in fresh water, brackish water and brackish water. It is one of the most important economic fish cultured in brackish water along the southern coast of China, and it is also one of the most widely distributed economic fish in the world. Mullet is a common marine fish, widely distributed in tropical, subtropical and temperate waters. There are more than 70 species of mullet in the world, and more than 20 species have been found along the coast of China.