Osmosis causes water to move from an area of lower solute concentration to an area of higher solute concentration. Freshwater fish are adapted to prevent water intake and conserve salts; saltwater fish are adapted to conserve water and excrete excess salts. Moving a fish from its native environment to one with significantly different salinity disrupts its osmoregulatory balance.
If a healthy freshwater fish is placed in saltwater, the fish
Asked in UPSC CAPF 2011 · Topic: Human Anatomy and Physiology (Homeostasis and Regulatory Mechanisms)
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