Evolution has given marine fish the ability to inhabit salt water. Marine fish can excrete excess salt. Chloride cells in their gills create an enzyme, gill Na+/K+ATPase, that rids their plasma of any excess salt that builds up within their bodies from the seawater. Part of the energy that a fish expends is used to get rid of salt. Their kidneys also selectively filter out divalent ions, which are then excreted by the fish.
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