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Why is maintaining water balance a different process for a freshwater fish than for a marine fish?

April 26, 2017Balance Biology different fish freshwater maintaining Mathematics process water

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Why is maintaining water balance a different process for a freshwater fish than for a marine fish?

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Marine water is Hypertonic to the body thus water wants to leak out of saltwater fish. Freshwater is Hypotonic to the fish and water wants to leak in. Thus marine fish drink constantly and excrete salt, while freshwater fish constantly have to remove water from their bodies.