To overcome the water/salt balance problem, fish have specialized cells that can either take in salts or excrete salts that are located in their

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Fish have specialized cells called chloride cells or ionocytes on their gills that are responsible for regulating the water and salt balance in their bodies. These cells can actively transport salts into or out of the fish's bloodstream depending on the osmotic conditions of the water they live in. This allows fish to maintain their internal salt concentration within a narrow range despite changes in environmental conditions.

To Overcome the Water/salt Balance Problem, Fish Have Specialized Cells