Why is marine fish not salty? Are marine fish salty

Fish living in the ocean have their own "desalination" that can remove the salt from the salty water they drink in time. For example, bony fish in the ocean have a strong ability to excrete salt, and have organs that specialize in salt excretion, which grow in the gill sheets of fish and are composed of "chlorine secretion cells". "Chlorine secretion cells" can secrete chloride, like a "freshwater workshop" on the fish, which can desalinate the seawater entering the fish, and the efficiency is quite high, even the world's most advanced "seawater desalination" is beyond reach, they take more water and less urine to maintain the hypotonic pressure in the body in order to make up for the loss of water.

The "desaliner" of cartilaginous fishes in the ocean, such as sharks, is another way, which does not have "chlorine secreting cells", but uses the action of urea in the body to remove salt. The urea content in their bodies is almost 100 times higher than that of other aquatic animals, which can not only keep cartilaginous fish with high osmotic pressure of body fluids and reduce salt penetration, but also accelerate the excretion of salt in the body, which can be called the "life-saving medicine" of cartilaginous fish.

It is precisely because the saltwater fish can remove the salt in the body on its own, so it is not salty to eat, and it is extremely delicious.

Marine fish have a strong ability to excrete salt, and in addition to excreting a small portion of salt from the kidneys, they also have specialized salt-excreting organs, namely "chlorine-secreting cells" located in the gill sheets.

Sea fish are not salty.

Fish in the ocean have their own "desalinations" that drain the salty water they drink from them. And this "desalination" is different between bony fish and cartilaginous fish, but the effect is the same, so the sea fish is not salty.

The sea is extremely rich in nutrients, especially a lot of nutrients, which makes marine fish higher in minerals and vitamins. In addition, the liver oil and body oil of marine fish contain a highly unsaturated fatty acid that is not found in terrestrial plants and animals, which contains a component called DHA (commonly known as brain**), which is an essential nutrient for the brain.

Because the concentration of salt in the body tissues of saltwater fish is much lower than the salt concentration in the seawater in the surrounding environment in which they live.

Seawater contains a lot of salt and is dense, while the osmotic pressure of fish body fluids is lower than that of the surrounding water environment. According to the principle of osmotic pressure, the water in the body group of the saltwater fish will continue to seep outward from the gills and body surface.

In order to maintain water balance in the body, saltwater fish must constantly swallow large amounts of seawater to make up for the water loss in the body. However, if a large amount of seawater is swallowed, the salt content in the fish body will increase greatly, so in addition to removing a part of the salt from the kidneys, saltwater fish mainly rely on the "chlorine secretion cells" in the gill tissue to complete the salt discharge.

In addition, there are some saltwater fish, mainly cartilaginous fish, such as sharks, which store the metabolized nitride in the form of urea in the blood, so that the blood concentration increases, and the osmotic pressure becomes comparable to that of seawater, so that there is no problem of water swallowing and salt excretion.

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This is because fish in the ocean have their own "desalinations" that remove salt from the salty water they drink. This "desalination" of bony fish and cartilaginous fish are different. Bony fishes in the ocean have a strong ability to excrete salt and have organs that specialize in rejecting salt.

Due to the efficient work of these salt-secreting cells, the salt content of marine fish is always kept low.

Cartilaginous fish have another set of skills to keep their bodies low in salt. They have a high concentration of urea in their blood, which is just right to maintain a high osmotic pressure in the body. This reduces the infiltration of salts from seawater, which accelerates the excretion of salts by the kidneys.

As a result, the meat of the fish will never become salty.

Difference Between Marine Fish and Freshwater Fish

Freshwater fish are fish that can live in freshwater with a salinity of 3 parts per thousand. Marine fish are mainly fish that live in the sea, such as hairtail, yellow croaker, etc. Freshwater fish are mostly herbivorous and omnivorous, and a small number are carnivorous. Marine fish, on the other hand, feed on a variety of flora, fauna and microorganisms in the ocean.

Another difference between marine fish and freshwater fish is that marine fish taste better than freshwater fish. This is mainly because the marine fish grow in the sea, and the swimming range and swimming force are very large, so the muscles of the sea water are more elastic and the taste is more delicious. In addition, freshwater fish mainly feed on saprophytes in the river, and the swimming range is also small, and the freshwater fish still have an earthy smell, so the taste of marine fish is better.

Fresh marine fish meat is actually not salty, because the marine fish itself has its own function of desalination of seawater, and the meat tastes relatively light. Only after making dried marine fish, it will feel salty when eaten, at this time we can soak it in light salt water to precipitate the salt inside, or soak it for a few hours before eating.

Many people think that the sea water is salty, so the fish living in it will definitely taste salty, in fact, this is wrong, and the fish itself is not salty, because they all have a function of desalination of seawater, which can discharge the salt drunk in time, so that the meat is light and liquid wheel.

Some people think that marine fish is salty, so it is mostly because it is made into dried marine fish, fresh marine fish after a large amount of salted and dried dried marine fish, directly eaten will feel particularly salty, even difficult to eat, at this time can not be avoided.

If you want to alleviate the saltiness of dried marine fish, then it is best to soak it in light salt water before eating, let the two react, analyze the salt, or soak it in water for a few hours before burying it, so that its saltiness will be much lighter and the taste will be better.

The body fluids of marine fish contain salt, but they are not as high as expected, and marine fish do not taste salty.

The amount of salt in the ocean is staggering, with concentrations of salts in seawater much higher than in fish blood and body fluids. However, not only was the fish not salted, but the salt content in its body did not increase, and it continued to live and reproduce freely in the sea. This is because marine fish have a strong ability to drain salt.

Fish living in the ocean have their own desalinators, which can discharge the salt from the seawater they drink in time. For example, the gill plates of hard-boned fish have specialized salt-draining organs; Cartilage fish use the action of urea in the body to eliminate salt.