Is the fish in the sea salty?

Today, a guest ordered seafood and asked the waiter about the knowledge of seafood. I didn't expect our waiter to make a joke that Wuchang fish is a marine fish. The following is a comprehensive introduction to the knowledge of fish.

River fish should be called freshwater fish. Common fish include 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.

Duobao fish-scientific name turbot, native to Europe and Atlantic coast. Its body is flat and almost round; The eyes are located on the left side of the body,

Duobao fish has high edible value. It not only has few bone spurs, but also has smooth and sweet taste, and has the effects of moistening skin, caring skin, tonifying kidney and strengthening brain, and helping yang to refresh. Europeans like to make Duobao fish into "fish chops". In China, especially in Guangdong and Hong Kong, steamed fresh food is the main way. The general eating method of Duobao fish is steamed whole, which belongs to a very traditional Cantonese style. Some restaurant chefs will start the meat of Duobao fish, and then steam the fish. In the sauce, they even use the red wine sauce commonly used in western food with Japanese cooking sauce. When serving, each Duobao fish steak is placed on a white porcelain platter, which is covered with red wine juice and mixed with condiments such as exposed bamboo shoots, which is as exquisite as a work of art. When eating this dish, everyone gets a fish steak, and in addition, each person is specially equipped with a set of knives and forks, so they can eat steamed fish like "sawing steak" in a western restaurant.

Tuna —— Tuna belongs to Scombridae of Perciformes, also called tuna, and the Chinese world is also called "Tunna (fish)". It is a warm-water migratory fish in the ocean, mainly distributed in low and middle latitudes, and widely distributed in the Pacific Ocean, Atlantic Ocean and Indian Ocean. Tuna is a healthy food for women to beautify and lose weight < P >. Second, it can protect the liver and strengthen the liver function. Third, it can prevent arteriosclerosis. Fourth, it can effectively reduce the cholesterol content. Fifth, it can activate brain cells and promote the internal activities of the brain. Sixth, it can effectively prevent iron deficiency anemia. Seventh, it can provide amino acids necessary for the human body. Eighth, it is an ideal choice for human metabolism, especially for children's food in the growing period. Tenth, it is the best companion of green vegetables. Pseudosciaena crocea-Pseudosciaena crocea of the class Perciformes. Also known as yellow flower, big fresh, yellow croaker, big yellow croaker. Main economic fishes in China offshore. It is one of the traditional "four seafood" (large yellow croaker, small yellow croaker, hairtail and squid). Pseudosciaena crocea has good meat quality and delicious taste, and "Squirrel Pseudosciaena crocea" is a feast. Most of them are fresh-sold, and others are salted into "melons". After eviscerating and salting, they are washed and dried to make "yellow croaker" or canned. The swim bladder can be dried to make a valuable food "fish belly" or "yellow croaker glue". The liver of Pseudosciaena crocea contains vitamin A, which is a good raw material for making cod liver oil. Otoliths can be used medicinally.

small yellow croaker-commonly known as small fresh, big eye, flower fish, cucumber, ancient fish, yellow scale fish, Koharu fish, golden dragon and thick scale fish. Mainly produced in Jiangsu, Zhejiang, Fujian, Shandong and other coastal provinces. The main differences between large and small yellow croaker are: the scales of large yellow croaker are small, while those of small yellow croaker are large and rare; The tail handle of large yellow croaker is longer than that of small yellow croaker. The second fin spine of the gluteal fin of Pseudosciaena crocea is equal to or larger than the eye diameter. The small yellow croaker is smaller than the eye diameter; The jaws of Pseudosciaena crocea have 4 inconspicuous small holes, while those of Pseudosciaena crocea have 6 small holes. The lower lip of Pseudosciaena crocea is longer than the upper lip. The mouth is round when closed, the upper and lower lips of small yellow croaker are equal in length, and the mouth is sharp when closed. Efficacy: Cod liver oil can be extracted from the liver of small yellow croaker. Tonifying liver and kidney, nourishing liver and improving eyesight.

Spanish mackerel —— Spanish mackerel belongs to the family Perciformes, and its scientific name is mackerel. Blue-spotted mackerel is also commonly known as swallow fish, plate mackerel, bamboo mackerel, pointed mackerel, green arrow and so on. Spanish mackerel is long and flat on its side, with bright silver color, dark stripes or black and blue spots on its back, large mouth, sharp snout, sharp teeth, quick swimming and fierce temperament. Generally, it is 26-52 mm long, and the largest one can reach more than 1 meter and weigh more than 2 kg. It is distributed in the western North Pacific Ocean and is produced in the East Yellow Sea and Bohai Sea in China. Spanish mackerel, a warm pelagic fish, feeds on small pelagic fish, migrates to the offshore in groups in summer and autumn, and some of them enter the Bohai Sea to lay eggs. In autumn, they often seek bait in groups near coastal islands and reefs, and are one of the economic fish in the northern sea area. Spanish mackerel, which lives in the upper layer, swims fast and likes to eat alive. Its meat is delicate, delicious and nutritious. Every 1 grams of fish contains 19 grams of protein and 2.5 grams of fat. Besides fresh food, it can also be processed into canned or salted products. The folks have the praise of "there are partridges in the mountains and sea horses". Dalian people are quite creative in eating Spanish mackerel, and there are a series of well-known snacks with a long reputation, such as Spanish mackerel dumplings, Spanish mackerel balls, Spanish mackerel stewed cakes, smoked Spanish mackerel, braised Spanish mackerel, etc., which have become a famous food in Dalian, attracting tourists from other places to try it quickly. Especially the Spanish mackerel pill soup, which is really a unique seafood with pill fragrance, fresh soup and delicious taste, is a human food suitable for all seasons, for all ages, both at home and abroad, and praised by diners.

In addition, Spanish mackerel also has dietotherapy functions such as refreshing and anti-aging. Regular eating will have a certain auxiliary effect on anemia, premature senility, malnutrition, postpartum weakness and neurasthenia.

Salmon, also called Salmon or Salmon, is a cold-water fish that grows in high latitudes such as Canada, Norway, the United States and Japan. Salmon is tender in meat, bright in color and smooth in taste, and has become a delicacy on the family table in recent years. Not only that, salmon also has high nutritional value. Salmon is not only a healthy food with high protein and low calorie, but also contains a variety of vitamins and minerals such as calcium, iron, zinc, magnesium and phosphorus, and is also rich in unsaturated fatty acids. Among all fish, salmon contains the most omega-3 unsaturated fatty acids (about 27 grams per 1 grams of salmon). Nutritional research has proved that omega-3 unsaturated fatty acids can effectively reduce the incidence of hypertension and heart disease, and also benefit chronic diseases such as arthritis and breast cancer, and promote the growth and development of fetuses and children. Practice: Fried salmon with honey, raw and grilled salmon, bell salmon < P >, stuffed salmon, etc.

marine fish will die in fresh water because of the high density and strong pressure of seawater. The reason why marine fish will die in fresh water is because their blood pressure adapts to the pressure of seawater, and the pressure of fresh water is low after entering fresh water, and the blood pressure of marine fish exceeds the water pressure, resulting in blood vessel burst and death.

There are many kinds of Chenghai fish (produced in Lijiang), mainly including big carp, dace, pressure dace, red-winged fish, goby, and recently introduced whitebait.

The big carp is fat, its head is particularly rich in fat, and its meat is tender. When the water is boiling in the pot, put in fresh fish, and add seasonings such as onion, ginger and pepper to eat it. Its taste is extremely delicious.

The eyes of dace are like agate. The fish is round and long, with tender scales and rich nutrition. It has a good nourishing and strengthening function for those who have recovered from a long illness. Whenever the rainy season, the pomfret fish welcomes the flood of the mountain stream and swims upstream, people dig ponds in the ditch and set up cards to catch them, and the fish obtained is called "Shuikou pomfret".

In recent years, the anchovy is almost extinct, but the red-winged fish actually thrives. It eats whitebait and seaweed cultured in Chenghai, and the strips are huge and full of fat. This kind of fish tastes good whether cooked or fried.

Chenghai whitebait, originally a whitebait species in Taihu Lake, was introduced in 199. Its meat is tender, creamy and spineless, and its protein is high in fat and calcium, so it is a kind of fish with high nutritional value.

yellow croaker-that is, yellow croaker, with large yellow croaker. The difference between small yellow croaker and small yellow croaker is that the meat is tender and delicious, and the meat is prickly and less. It is suitable for steaming and braising. The famous dishes include net oil fish, bad fish fillets, cabbage yellow croaker soup, phoenix tail yellow croaker and so on.

Hairtail —— The meat is finely carved, and the proportion of head and viscera is small. It is an economical popular variety, and there are two kinds: fresh and Wei. The former tastes better, and the dishes often cooked are dry fried hairtail, braised hairtail and osmanthus hairtail.

mackerel, also known as oil tube fish, has solid meat and rich nutrition, and its dishes include fresh and fragrant mackerel, boiled mackerel and cabbage mackerel.

Cod-garlic cloves, with few thorns, is sold in the market as a frozen variety with the head and tail removed, which is economical and practical, and can be braised, dry-roasted, boiled at home and so on.

The difference between marine fish and river fish:

1 Marine fish generally have sharp teeth, while river fish rarely have teeth.

2 Marine fish generally have no scales or fine scales, while river fish generally have scales and are relatively large.

3 Marine fish have a fishy smell, while river fish have a muddy smell.

4 In order to swim faster, marine fish generally have smaller heads and narrower bodies. On the contrary, the meat of river fish is soft and prickly.

6 Sea fish and river fish are much more grotesque than the general ones. They are also rich in color, and most of them have patterns.

7 Look, sea fish are generally rich in color, and the scales on his body are larger than those of river fish, and they are easy to loosen, and the sea rain is generally dense and tight.

8 Press the fish body with your hands, and the sea fish is tight and hard.

No matter 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 amount and ratio of essential amino acids are most suitable for human needs, so it is a good source for human to ingest protein. Secondly, fish meat contains less fat and is mostly composed of unsaturated fatty acids, and 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. Fish's liver contains a lot of vitamin A and vitamin D. In addition, the muscle fiber of fish is very short, and the water content is high, so the meat is tender and more easily absorbed 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.

the nutrition and taste of marine fish are slightly better

Just because the nutritional components are almost the same does not mean that the nutritional value of them is exactly the same. 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 kind of highly unsaturated fatty acid that plants and animals on land do not have. < P > It 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 heart and brain.

In terms of taste, sea fish tastes fresher than river fish. This is because the swimming range and swimming strength of marine fish are larger than those of river fish, which makes its muscle elasticity better and tastes delicious. River fish, on the other hand, tastes earthy because they grow in water with more humus. Such an environment is suitable for actinomycetes to reproduce and grow. Bacteria invade fish blood through fish gills and secrete a brown substance with earthy smell, which is difficult to get rid of during cooking.

Steamed river fish smells earthy

When it comes to eating fish, it is suitable for all ages, and steaming and braising are suitable. Crucian carp in river fish is suitable for the elderly, children and pregnant women because of its long growth period, soft meat and high nutritional value. However, some freshwater fish, such as carp and silver carp, are difficult to cover up their earthy smell when steamed, and their taste is far worse than that of marine fish.

It's best to eat marine fish cooked, and raw food will cause severe abdominal pain and allergy due to the infection of Anisodes. Eating freshwater fish depends on whether it is salvaged from polluted water. Contaminated fish contains toxins, which will do harm to health.