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Why cant fresh-water animals survive in salt water?

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Some fish species can live in both freshwater and saltwater. These species are called euryhaline fish. However, most fish species can only survive in one or the other based on their salinity tolerance, or how much salt their bodies can handle. read more

Sea water fish has different body chemistry than that of fresh water and vice versa, as they are adapted to their existing environment. Bodies of fresh water fishes are designed to absorb water from outside whereas the reverse occurs in case of marine fishes, whose body is equipped to loss of water to the sea water. read more

The reason freshwater fish cannot survive in saltwater and vice versa has a lot to do with a property of a liquid called tonicity. In simple words, it is the ability of a solution to exert osmotic pressure upon a membrane. read more

So salt water fish lose their body's water to the sea, and will drink sea water to replace it. Fresh water fish, on the other hand, have excess body water and are always excreting (urinating) the excess. Basically, salt water fish = water flows out of their body. Fresh water fish = water flows in. read more

The main issues are Tonicity and Osmoregulation . Animals living in freshwater have greater salt contents than the surrounding water (the water is an hypotonic solution). read more

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Why cant fresh-water animals survive in salt water? - Quora
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