Saltwater fish are adapted to live in environments with high salinity. When placed in freshwater, osmosis causes water to move into the fish's cells, as the concentration of solutes is higher inside the fish than in the surrounding water. This influx of water can cause the cells to swell and potentially burst, leading to the fish's death. Additionally, the fish's kidneys and gills are not adapted to expel the excess water efficiently, further contributing to its inability to survive in a freshwater environment.
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