One: The overall nutritional value of the flesh of sea fish and river fish is roughly the same:
The biggest difference between river fish and sea fish lies in the environment in which they grow.
In fact, strictly speaking, river fish should be called freshwater fish, common carp, crucian carp, grass carp, silver carp, wuchang fish, tilapia, eel, etc.; sea fish include scallop, tuna, large yellowtail, small yellowtail, Spanish mackerel, as well as salmon and turbot.
Whether it is freshwater fish or sea fish, its nutritional composition is largely the same, the total nutritional value is very high. First of all, fish is rich in protein, which contains the amount and ratio of essential amino acids most suitable for the needs of the human body, therefore, it is a good source of protein intake for human beings. Secondly, the fat content in fish is low and mostly composed of unsaturated fatty acids, which can be absorbed by the human body up to 95%, with the effect of lowering cholesterol and preventing cardiovascular and cerebrovascular diseases. Third, fish meat is rich in minerals, such as iron, phosphorus, calcium, etc.; fish liver contains a large number of vitamin A and vitamin D.
In addition, fish muscle fibers are very short, the water content is high, so the meat is tender, more easily absorbed than the meat of livestock and poultry. Compared with foods that are highly nutritious but not easily absorbed, fish is more favorable to people's health.
Two: sea fish nutrition, flavor slightly better:
Nutritional composition is almost the same, not equal to the nutritional value of the two are exactly the same. Sea fish in the content of nutrients than river fish, nutritional value is slightly better.
The sea is extremely rich in nutrients, especially containing a large number of nutrient salts, making the mineral and vitamin content of sea fish higher. In addition, the liver oil and body oil of sea fish contain a highly unsaturated fatty acid that is not found in plants and animals on land, which contains the ingredient known as DHA (commonly known as brain gold), a nutrient essential for the brain and very important for improving memory and thinking ability. In addition, the omega-3 fatty acids and taurine content in marine fish are much higher than that of freshwater fish, which has a protective effect on the heart and brain.
Sea fish also tastes fresher than river fish in terms of flavor. This is because sea fish has a greater range of movement and strength when swimming than river fish, making its muscles more elastic and flavorful. River fish, on the other hand, taste earthy because they grow in water with more humus. Such an environment is suitable for actinomycetes to reproduce and grow, and the bacteria invade the blood of the fish through the gills and secrete a brown substance with an earthy odor, which is difficult to remove during the cooking process.
Three: River fish have an inherent earthy flavor:
When it comes to eating fish, steaming, braising and other practices are more suitable.
Carp in river fish is suitable for the elderly, children and pregnant women due to its long growing period, fluffy meat and high nutritional value. But carp, silver carp and some other freshwater fish, steaming is difficult to hide its earthy flavor, the taste is far worse than the sea fish.
Eating sea fish is best eaten cooked, raw food will be infected by heterotrichous nematode triggering severe abdominal pain and allergies; eating freshwater fish depends on whether it is salvaged from polluted water, polluted fish contain toxins, which can be harmful to health.
Four: Types of marine fish:
Marine fish is divided into natural growth and artificial farming.
Some of the sea fish can not be artificially cultivated, for example, the market is often available in the sea water fish, can not be artificially cultivated scallop, Spanish mackerel, pomfret, yellow gourami, sardines, boss fish, small yellow croaker, etc., squid and squid can not be artificially cultivated.
Both fishing and artificial culture of sea bass, black skirt, croaker, six lines of fish, as well as crabs, jellyfish and other seafood;
Basically all artificial culture of turbot, croaker, turbot, half-slip tongue spoiled and so on.
Five: freshwater fish (river fish) species
Our daily life, often eat the most famous freshwater fish are four big fish carp, silver carp, grass carp, mackerel.
There are also eels and soft-shelled turtles.
Of course, there are many other varieties of river fish.