Which physiological effect occurs when a saltwater fish is abruptly placed into freshwater?

💡 Explanation

When a saltwater fish abruptly enters freshwater, osmotic pressure rapidly increases inside the fish’s cells because water moves from low to high solute concentration, potentially causing cell lysis. Therefore, cell lysis is the initial effect, rather than ion loss, urea overload, or dehydration which are related to different osmoregulatory failures in hyper or hypo-osmotic environments.

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