What happens if you put freshwater fish in the sea?

We all know that fish can be divided into freshwater fish and marine fish. Freshwater fish mainly live in rivers and lakes on land. Because the salt content in the water is relatively low, they are called “freshwater fish”, while marine fish mainly live in the sea. Because the salt content in the sea is relatively high, freshwater fish will not swim into the sea with the river. But in fact, there is such a kind of fish, which we call extensive ductility fish, such as salmon. They are amazing. They can live freely in both salt water and fresh water.

We all know that fish living in the sea can’t be raised in fresh water, so we usually put some salt in the water where the seafood is stored after we buy seafood to create a virtual seawater environment. But friends, have you ever thought about what would happen if you put freshwater fish in the sea?

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The seemingly simple problem Xiao Bian may have to explain from the perspective of biology. I don’t know if you know about “osmotic pressure”. For example, if a freshwater fish lives in fresh water, its salt content is generally the same as that of the outside world. At this time, we say the osmotic pressure is equal. But if the salt content in the outside is less than that in the fish, we say that the osmotic pressure in the fish is high. At this time, in order to adjust the osmotic pressure balance, the water will automatically flow from the low place to the high place. That’s it.

So what happens if you put freshwater fish in the sea?

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The salt content of freshwater fish is equal to that of fresh water, and the salt content of fresh water is less than that of sea water. In other words, the salt content of freshwater fish is less than that of sea water. At this time, if we put freshwater fish into the sea, because the osmotic pressure in the sea is greater than that in the body of freshwater fish, the water in the body (cells) of freshwater fish will flow into the sea, which is very fatal, and the fish will eventually dehydrate and die.

See here, do you know why salmon and other extensive fish can survive in the sea? Welcome to leave a message for discussion.

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This article is the original work of Zhou Zhiquan, the author of Jiujian

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