Whether it is marine fish or freshwater fish, fish meat is a high-protein and low-fat food, rich in vitamin A, vitamin D, vitamin E, vitamin B 1, vitamin B2 and nicotinic acid. The best thing is that the fat contained in fish is mainly unsaturated fatty acids, accounting for more than 80%. Eicosapentaenoic acid (EPA) and eicosahexaenoic acid (DHA) have the functions of regulating blood lipid, preventing atherosclerosis and assisting anti-tumor.

What's the difference between sea fish and freshwater fish? That is to say, the contents of EPA and DHA in marine fish, especially deep-sea fish, are much higher than those in freshwater fish. Actually, this is easy to explain. As mentioned above, EPA and DHA are both fats. In the deep sea, because there is no sunshine, it is very cold in the deep sea, and fish need to grow more fat to keep warm. Therefore, the fat of deep-sea fish is much higher than that of freshwater fish, and the contents of EPA and DHA are slightly higher. The representative of deep-sea fish is salmon. When we fry salmon in the pan, we can fry the fat in the salmon without putting oil.

When it comes to salmon, you have to mention sashimi. Salmon is the most popular sashimi. As mentioned above, the fat content is high and the meat is delicious. There is a lot of controversy about sashimi, which is difficult for people who don't like it. They think sashimi has excessive bacteria and parasites. However, people who love to eat are hard to extricate themselves, thinking that eating raw can enjoy the delicious fish, and there is less nutrient loss without cooking at high temperature. Therefore, whether sashimi can be eaten depends on whether it has undergone strict sterilization and insecticidal treatment. Reasonable treatment is an effective defense against fish parasites. At present, the more scientific and reliable method is quick freezing. Therefore, before eating sashimi, it is necessary to know whether the fish has been effectively treated. It is good to eat once in a while, but it is not recommended to eat often ~

The Dietary Guide for China Residents suggests that we eat 280-525g of fish every week.

Author: worship Shanshan

National second-class public dietitian/registered nutrition technician/national senior health manager/third-stage student of Professor Wang Xingguo's special nutrition training course.

Fish has high nutritional value, and it is a good source for people to ingest protein.

We often eat two kinds of fish: marine fish and freshwater fish. They grow in different environments. Is there any difference between the two?

Let Brother Chao answer your question.

The answer comes first: whether it is freshwater fish or marine fish, the nutritional components are roughly the same, and the total nutritional value is high.

But in general, the EPA and DHA content of marine fish is more than that of freshwater fish, and the taste is more delicious.

Marine/saltwater fish

There are many fish living in the sea, including Cheng Hai fish, hairtail, tuna, large yellow croaker, small yellow croaker, Spanish mackerel, salmon and turbot [1].

freshwater fish

Common freshwater fish are carp, crucian carp, grass carp, silver carp, Wuchang fish and Luo freshwater fish, mainly referring to fish in rivers, lakes and seas. There are about 800 species of freshwater fish in China, including about 400 species of CYPRINIDAE.

The difference between marine fish and freshwater fish

Both marine fish and freshwater fish belong to fish, with roughly the same nutritional components and high nutritional value. Although marine fish and freshwater fish have many similarities, their taste and nutrition are slightly better than freshwater fish.

Nutritionally speaking, marine fish contain more vitamins and minerals, because seawater contains more nutrients than fresh water. In addition, the body oil and cod liver oil in marine fish contain a highly unsaturated fatty acid, which contains "brain gold", also known as DHA. DHA is an essential nutrient in human brain, which is of great significance for improving people's thinking ability and memory [1]. Marine fish is also rich in EPA, whose main function is to slightly reduce triglycerides and prevent hypertriglyceridemia and vascular diseases.

By analyzing and comparing the contents of EPA and DHA in the muscle and visceral fat of the above-mentioned 14 species of marine fish and freshwater fish, it was found that the DHA content in the muscle and visceral fat of fresh freshwater fish bass was the highest among all the tested samples, accounting for 18.6% ~ 20. 1% of its fatty acid composition. In addition, the contents of EPA and DHA in marine fish are the highest.

But for special people, such as infants, because EPA can competitively inhibit arachidonic acid from synthesizing two kinds of prostaglandins, thus affecting their growth and development, freshwater fish with low EPA content are more suitable for infants [2].

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 their muscles more elastic and delicious. Ordinary freshwater fish will taste "earthy smell" because freshwater fish mainly grow in water environment with more humus [1].

abstract

Both marine fish and freshwater fish belong to fish, which are high in nutrients. However, due to the growing environment, there is a certain gap in nutrition and taste. The content of EPA and DHA in marine fish is more than that in freshwater fish, and the taste is more delicious, but in fact, freshwater fish also contains EPA and DHA, so it is not necessary to choose only marine fish to eat.

Super brother reminds:

A balanced diet and a healthy lifestyle are more important.

refer to

Sun Jianhua. Difference of nutritional taste between marine fish and freshwater fish [J]. Modern food, 2016 (02):112.

Zulia, Luo, Fan Tie. Comparison of EPA and DHA contents in marine fish and freshwater fish fat [J]. China Petroleum, 2003( 1 1):48-50.

Author: Qiu Zhongyun Zhao

1, the living environment is different, marine fish live in the sea, freshwater fish live in fresh water such as rivers.

2. The salt content of seawater is 16 ~ 47%. The salt concentration in fresh water is 0.0 1 to 0.5‰, which is quite different.

There is not much difference in nutritional value between Shanghai fish and freshwater fish. They also contain fat, protein and vitamins, which can be used for tonic. Marine fish are more nutritious, especially minerals and unsaturated fatty acids.

4, marine fish taste better, they grow in the ocean, the activity surface is larger and more frequent, the elasticity of meat is better than that of freshwater fish, mainly eating seaweed and microorganisms for a living, so the taste may be better. Freshwater fish are all raised artificially except for their small active areas. But it varies from person to person, and everyone has different tastes.

Under normal circumstances, marine fish will die soon after being caught. Due to the high pressure at the bottom of the sea, marine fish surfaced. Because of the internal pressure, the abdomen soon burst and died. Therefore, there are ice cubes in the transportation of marine fish, which are easy to deteriorate if they are not properly preserved. Freshwater fish are different. They live in shallow waters and are not suitable for death when caught, so they can eat live fresh freshwater fish. Therefore, in terms of freshness, we still choose freshwater fish.

6. protein of marine fish is an exotic protein, which is easy to cause allergies. Therefore, when eating, you need to choose according to your own physique. Prevent allergies.

Here, the differences between marine fish and freshwater fish are analyzed from three points:

First of all, there are great biological differences between marine fish and freshwater fish. After all, marine fish can only drink seawater, so its body structure must have a specific structure for discharging excessive salt from the body.

As shown above, marine fish not only take in salt in food, but also take in a lot of salt from seawater. Therefore, its skin, gills and excretory system have to bear the function of excretion.

Secondly, marine fish have fewer intermuscular spines and are relatively easy to eat. Intermuscular spines are mucro in muscles, which are used to conduct muscle contraction and help fish coordinate muscle contraction. Generally speaking, it is one of the characteristics of lower fish, while the intermuscular spines of higher fish are few.

Finally, the content of ω-3 unsaturated fatty acids in marine fish is significantly higher than that in freshwater fish.

Fish can't synthesize omega-3 unsaturated fatty acids by themselves, but only through food intake. In fact, only a variety of algae in seawater can synthesize ω-3 unsaturated fatty acids. Through the complex food chain:

Algae → zooplankton → small arthropods → small fish → large fish,

It is enriched by seaweed into a big fish.

However, algae that can synthesize ω-3 unsaturated fatty acids only exist in seawater, so freshwater fish obviously lack this valuable nutrition.

There are three major differences between marine fish and freshwater fish:

There are few fishbones in the sea, only one spine. Freshwater fish have many spines, especially the small spines in the meat. The more tender the fish bones, the more annoying it is. For example, the three delicacies of the Yangtze River have more thorns than one. Fresh ones can't wait to be swallowed in one gulp, but you have to show patience in eating crabs and pick holes one by one. But freshwater fish without scales have fewer thorns. Why don't Americans let China carp flood instead of eating it? This is because of thorns.

Marine fish tastes fresh, and freshwater fish smells fishy, especially when it is fresh, and it is fresh when cooked. There are fewer parasites in marine fish and more parasites in freshwater fish. Therefore, sea fish sashimi is delicious, and freshwater fish have to be braised in brown sauce.

3. There is less pollution from marine fish, more pollution from freshwater fish and more kinds of pollution. Because most freshwater fish live in stagnant water, there is as much pollution as there is, and it cannot be discharged. There are more pollutants in rivers and streams, because the long river basin is conducive to smuggling. Clear water is in Tibet, but fish is regarded as a god there. No catching or eating is allowed. Let you eat everywhere, and only in your dreams.

As for eating marine fish or freshwater fish, there is no fundamental difference in nutrition, and they are all white meat that is most suitable for the human body. According to your actual situation, if you live by the sea or come into contact with seafood, you will eat marine fish. You can't touch sea fish at all, you can only eat freshwater fish.

What's the difference between sea fish and freshwater fish? Let the chef give you a dish to answer ~!

Freshwater fish and marine fish

Most freshwater fish are prickly, earthy, cultured, cheap and close to the people!

Most marine fish, with few thorns, are delicious and expensive, especially deep-sea fish!

Most freshwater fish have more parasites than marine fish.

Most freshwater fish are not as good as deep-sea fish, and their bodies are relatively small.

Most freshwater fish should not be eaten raw, while most marine fish can be eaten raw.

Most freshwater fish are suitable for burning, stewing and frying, but not for steaming, but marine fish can.

Most freshwater fish can be farmed, but many marine fish cannot be farmed.

You can buy most freshwater fish, but there is no place to buy many marine fish.

Rich people like to eat sea fish, while ordinary people can only eat river fish. .....

There are many kinds of marine fish and freshwater fish, most of which are edible. Because of its high nutritional content and delicious taste, it has always been one of people's favorite ingredients.

So what's the difference between freshwater fish and marine fish?

First, the muddy smell of freshwater fish is heavier than that of marine fish;

Second, freshwater fish have more intermuscular spines than marine fish;

Third, the meat quality of freshwater fish is rougher and looser than that of marine fish;

4. Freshwater fish parasites are more likely to appear than marine fish.

Fifth, the price of freshwater fish is cheaper than that of marine fish;

Freshwater fish are cultivated more than seafood.

Seven, freshwater fish can basically eat fresh, deep-sea fish are basically chilled;

Eight, "radish and green vegetables" have their own love; There are many kinds of fish, each with its own characteristics. As long as it is handled properly and cooked uniquely, it is delicious food.

9. How much do I know about food? Thank you for your question. Answer over!

I used to be in the aquatic product business. Personally, I think there are two main differences between freshwater fish and marine fish, that is, price and taste. I remember when I was working in the aquatic product market, an ordinary freshwater fish,

As long as 3-5 yuan a catty can be bought, but an ordinary marine fish needs at least 5-9 yuan a catty, so this price issue is the biggest difference between marine fish and freshwater fish. These two kinds of fish are in taste.

There is also a big difference. I believe everyone knows that marine fish tastes tasteless or umami, but freshwater fish, except for earthy smell, is earthy smell, even if it is a little umami.

It is also very expensive, so this taste problem is also a more important problem. In fact, these are not the most important. The most important thing is whether it is farmed or wild, because according to the information I got,

More than 50% of freshwater fish on the market are farmed artificially. Since there are many farmed fish, it must be bad in all aspects. After all, freshwater fish grown up with feed can be better, but marine fish are different.

Because only 5% of marine fish are farmed and most of the rest are wild, we'd better buy marine fish when buying edible fish.

Conclusion: When we buy fish, whether it is freshwater fish or marine fish, we should buy fresh fish, because these fresh edible fish are more common than processed freshwater fish in taste and nutritional value, and most of them are close to the people. Because of the origin and growth, the price of marine fish is basically a little more expensive. I think the best thing about marine fish is that there are basically few thorns. Very suitable for the elderly and children. There are also many special nutrients. Freshwater fish are also more expensive and have high nutritional value.

soft-shelled turtle

Turtle is also called tuanyu. Its nutritional value is very high. Its meat has the delicious taste of chicken, deer, cattle, sheep and pigs, so it is known as "five flavors of good meat". Turtle is not only rich in protein, but also contains many trace elements needed by human body. Eating soft-shelled turtle regularly can play a very good role in keeping in good health. Boiling soup with turtle and medlar has a good effect on improving immunity, losing weight and resisting aging.

eel

Eels mainly grow in tropical and temperate waters. Its nutrients are much higher than those of perch, chicken and beef, and the contents of vitamins, minerals and trace elements are unmatched by land animals. Therefore, eel has the functions of tonifying deficiency, nourishing blood, eliminating dampness and resisting tuberculosis, and is a good nutrition for patients with chronic illness, anemia and tuberculosis.

Snakehead Terror

Snakehead has the effects of invigorating spleen, promoting diuresis, removing blood stasis, promoting tissue regeneration, clearing away heat and expelling wind, and nourishing liver and kidney. Cooking snakehead with ginger and red dates has an auxiliary effect on the treatment of tuberculosis. Braised snakehead with brown sugar can cure nephritis. Eating steamed snakehead can promote lactation and enrich blood.

Black fish is cold and sweet, belonging to the spleen and stomach meridian; Treating five hemorrhoids, treating damp arthralgia and facial edema, can "tonify the heart and nourish yin, clear kidney water, drain water and seep dampness, detoxify and clear heat". Has the effects of invigorating spleen, promoting diuresis, removing blood stasis, promoting tissue regeneration, and clearing away heat, and can be used for treating edema, dampness arthralgia, beriberi, hemorrhoid, and scabies.

In short, there are different places, depending on the needs of consumers. thank you