Salt water fish have basically been brining their whole lives. So why aren’t they automatically salty when you eat them?
In: Biology
Saltwater fish have an excretion system to get rid of excess salt. Without that the sea would be poisonous to them just as it is to us and freshwater fish. Differences in salinity inside and outside the cells would cause water to travel into or out of cells to equalise it by osmosis. So they would either lose water and shrivel up or gain water and explode. It’s all to do with the salinity level that was normal when animal cells evolved.
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