Which consequence results when a freshwater fish's gills excessively permeable to ions?

💡 Explanation

When a freshwater fish's gills are excessively permeable, osmotic diffusion causes water influx because the fish is hypertonic relative to its environment, moving water down the concentration gradient. Therefore, accelerated water influx results, rather than urine changes, electrolyte uptake, or poor oxygenation, which involve alternative osmoregulatory or respiratory responses.

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