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Can salt water fish live in fresh water and vice versa?

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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

Pure marine fish cannot live in freshwater and vice versa. Their body chemistry are different. However there are some fish which are called brackish water fish which are found in areas where rivers meet sea, and they have a wide tolerance of salinity in 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. Tonicity comes in three types: hypertonic, hypotonic and isotonic. read more

Some fish live in fresh water but migrate to the sea to spawn, like eels. But for the most part, the salt water and freshwater fish are only able to live in the one or the other environment. read more

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