The chloride cells actively remove ions from the body and water follows by osmosis.
The chloride cells create a countercurrent system where ions are lost from the body and water is absorbed to dilute other ions (NaCl). Marine fishes can excrete salt by clusters of special cells (chloride cells) in the gills.
In euryhaline bony fish, gills usually secrete extra chlorine to maintain a constant plasma chlorine concentration in environments of different salinity. Fishes are exposed to major osmotic challenges in freshwater and marine environments.
Osmosis is the diffusion of water across a membrane in response to osmotic pressure caused by an imbalance of molecules on either side of the membrane.
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