Marine fish, fish that live in the sea, such as hairtail and yellow croaker. Marine fish will die in fresh water because of the high density and strong pressure of seawater. Marine fish will die in fresh water because their blood pressure adapts to the pressure of seawater. After entering fresh water, the pressure of fresh water is low, and the blood pressure of marine fish exceeds the water pressure, causing blood vessels to burst and die.
Strictly speaking, river fish should be called freshwater fish, such as carp, crucian carp, grass carp and eel. Marine fish include hairtail, tuna, large yellow croaker and small yellow croaker. Experts pointed out that both freshwater fish and marine fish have roughly the same nutritional components, and the total nutritional value is very high. However, marine fish has more nutrients than river fish, and its nutritional value is slightly better.
The sea is extremely rich in nutrients, especially a lot of nutrients, which makes the contents of minerals and vitamins in marine fish higher. In addition, the liver oil and body oil of marine fish contain a highly unsaturated fatty acid that plants and animals on land do not have, which contains a component called DHA (commonly known as brain gold), which is an essential nutrient for the brain and is very important for improving memory and thinking ability. In addition, the contents of omega-3 fatty acids and taurine in marine fish are much higher than those in freshwater fish, which has protective effects on the heart and brain.