Which physiological consequence осcurs when migratory salmon enter freshwater rivers from saltwater?

💡 Explanation

When salmon migrate to freshwater, osmotic influx occurs because the freshwater has a lower solute concentration than their body fluids; this causes water to move into the fish. Because osmosis drives water influx, aquaporins proliferate in gill membranes increasing water permeability, counteracting dehydration. Therefore, aquaporin proliferation occurs, rather than chloride cell decrease, dense urine, or sodium reabsorption, which adapt to saltwater conditions.

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