Which mechanism causes tissue swelling, called edema, in freshwater fish due to osmoregulatory failure?

💡 Explanation

When freshwater fish experience osmoregulatory failure, water influx occurs because their internal salt concentration is higher than the surrounding water, leading to water entering through permeable surfaces like the skin, resulting in edema. Therefore water influx results, rather than ion uptake, reduced urine, or sodium loss which serve compensatory roles.

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