The protein content of fish is between 14%- 18%, and deep-sea fish is not higher than ordinary freshwater fish. The fat and water content of fish vary greatly. The fat content of fat-free marine fish such as haddock and cod is only 0. 1%~0.4%, while the fat content of fat-rich marine fish such as eel, herring and tuna is as high as 16%~26%. Most fish have a fat content between the two.

The fat of marine fish is rich in ω-3 long-chain unsaturated fatty acids, which is beneficial to reducing blood fat.

Main nutrients: protein, fat, calcium, phosphorus, iron, iodine, amino acids, etc.

Main edible effects: strengthening the body, lowering cholesterol and preventing cardiovascular and cerebrovascular diseases.

Compared with freshwater fish, the contents of trace elements such as iodine, selenium and manganese in marine fish are higher, and the contents of vitamins A and D in fish meat are also higher.

Some freshwater fish have special nutritional and health care values:

Bighead carp and silver carp provide fatty acids for health.

Silver carp and bighead carp are important fish species in freshwater culture, and their muscles contain a lot of n-6 essential fatty acids and n-3 series fatty acids, which have anti-arteriosclerosis effects. Phytoplankton is the original source of fatty acids, and the fatty acid composition of fish is influenced by lipids in feed. For example, 18 carbon n-6 and n-3 polyunsaturated fatty acids in feed can be desaturated, extending to 20 carbon and 22 carbon desaturated fatty acids in silver carp and bighead carp. Silver carp and bighead carp that feed on plankton are rich in eicosapentaenoic acid and eicosahexaenoic acid, while grass carp and carp are rich in n-3 polyunsaturated fatty acids. Experiments show that eating silver carp and bighead carp regularly is beneficial to human health and can prevent arteriosclerosis, especially for patients with cardiovascular diseases.

Fish head tofu soup can strengthen the brain.

Fish-head tofu soup is not only rich and delicious, but also beneficial to brain health and longevity. Drinking fish head and tofu soup often can strengthen the brain because bighead and tender tofu are high-protein, low-fat and vitamin-rich foods. Both of them are rich in brain-nourishing substances-lecithin, which can increase memory, thinking and analytical ability and make people smart.

Nutritionists have made a chemical analysis of bighead carp. The results show that bighead carp is the top grade of many fish heads. It is rich in unsaturated fatty acids, which is extremely important for brain development and can enhance the activity of brain cells and enhance judgment. Therefore, eating fish head tofu soup often can not only strengthen the brain, but also delay the mental decline of middle-aged and elderly people.

Fish is rich in nutrition and delicious, which has health care function for human body. People love to eat fish, but there are many kinds of fish, and different fish have different health care functions, which is not clear to everyone. The health functions of several common freshwater fish were introduced.

Bighead carp has the effects of warming stomach and nourishing blood, dispelling head wind and benefiting brain marrow, and has certain curative effect on dizziness caused by irregular menstruation, dysmenorrhea and cold, as well as postpartum headache and dizziness.

Grass carp has the effects of warming stomach, calming liver and expelling wind, and is a health food that warms the middle warmer and tonifies deficiency.

The shad has the functions of strengthening bones and muscles, tonifying middle energizer, stimulating appetite, promoting blood circulation, absorbing wind, promoting diuresis and removing dampness.

Silver carp has the effects of warming middle warmer and benefiting qi, warming stomach and moistening skin, and is a health food for warming middle warmer and benefiting qi.