Mandarin fish, also known as squid, is a carnivorous scaly fish; Taxonomically, it belongs to fatty fish. Siniperca chuatsi has a flat body, a bulging back, a thick body and a pointed head. It is one of the "four famous freshwater fish" in China.

The biggest difference between freshwater fish and marine fish lies in the growing environment. Marine fish live in the sea of Wang Yang all their lives, while freshwater fish live in the fresh water of rivers, lakes and seas all their lives.

Common freshwater fish are carp, crucian carp, grass carp, silver carp, Wuchang fish, tilapia and eel.

Marine fish include hairtail, tuna, large yellow croaker, small yellow croaker, Spanish mackerel, salmon and turbot. ?

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. The liver of fish contains a lot of vitamin A and vitamin D, and the muscle fiber of fish is very short and has high water content, so the meat is tender and easier to absorb than the meat of livestock and poultry. Fish is more beneficial to people's health than food with high nutritional value but not easy to absorb. ?