The protein content of fish is about 15 ~ 24%, so fish is a good source of protein, and the absorption rate of protein is very high, about 87 ~ 98% will be absorbed by human body. The fat content of fish is much less than that of livestock meat. Fish contains very special ω-3 series fatty acids, such as EPA(Ecosapenoic acid) and DHA(Decosahexanoid acid). In addition, fish oil is also rich in vitamins A and D, especially in the liver of fish. Fish also contains water-soluble vitamin B6, B 12, nicotinic acid and biotin. Fish also contains minerals, most obviously lilac fish or sardines, which are good sources of calcium if eaten with bones; Marine fish are rich in iodine; Others, such as phosphorus, copper, magnesium, potassium and iron, can also be taken when eating fish.