Whether freshwater fish or marine fish, their nutritional components are basically the same, and their total nutritional value is very high. First of all, fish is rich in protein, and the quantity and proportion of essential amino acids are most suitable for human needs, which is a good source for human to ingest protein. Secondly, fish contains less fat and is mostly composed of unsaturated fatty acids. The absorption rate of human body can reach 95%, which has the functions of lowering cholesterol and preventing cardiovascular and cerebrovascular diseases. Thirdly, fish is rich in minerals such as iron, phosphorus and calcium. Fish liver contains a lot of vitamin A and vitamin D.