1, protein: The protein content of fish muscle is generally 15%-25%, and the muscle fiber is thin and short, with high moisture content in the tissue and tender taste, which is more easily digested and absorbed by the gastrointestinal tract than protein of poultry and livestock.

2. Fat: The average fat content of fish is 1%-3%, and the specific content is related to the species. Such as eels, tuna and so on. The fat content is high, but the cod fat content is low. Fish fat contains a lot of unsaturated fatty acids, which is an important source of essential fatty acids for human body and has certain effects of reducing blood fat and preventing atherosclerosis.

3, vitamins: marine fish liver contains a lot of vitamin A and vitamin D, which is an important source for the human body to obtain vitamin A and vitamin D, which can promote the body's absorption of calcium, contribute to bone health and protect vision.

4. Minerals: The mineral content of fish is 1%-2%, which contains many minerals such as iron, calcium, potassium, sodium and zinc, and is rich in nutrition.