Biology, asked by mrigankoghosh160, 1 year ago

Why do saltwater fish die when placed in freshwater?

Answers

Answered by vi1
0
Saltwater fish need to maintain their body salt concentration lower than that of their surrounding water, which emans their gills and kidneys work so that they can absorb water while keeping out most of the salt, plus getting rid of excess salt.

In freshwater, however, the problem s the opposite: the water has a lower salt concentration than that needed by the fish’s body. So freshwater fish gills and kidneys do the opposite: they get rid of excess water while keeping the necessary salts.

So waht happens when you put a saltwater fish in freshwater? You can guess: its gills and kidneys will keep trying to get more water into their bodies… while getting rid of salt. This means their bodies will get too much water and they will rapidly lose their blood salt content, which is not god. This will lead to hyponatremia, which will be fatal in a matter of hours or less. This can happen to humans who drink too much water, too: Water intoxication

A human can stop drinking water once they’ve had enough, but most saltwater fish can’t.

Similarly, freshwater fish thrown into saltwater will become dehydrated.

Lastly, there are some fish species which are able to live in both environments. They do need, however, some acclimation period in order to adjust their systems to the radically different conditions.

hope this helps you.
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