Which risk sharply increases when a freshwater fish with compromised kidney fails during sudden brackish water exposure?

💡 Explanation

When kidneys fail, osmotic regulation fails, and exposure to brackish water causes rapid osmosis from the fish's cells because water concentration outside increases substantially beyond osmoregulatory capacity. Therefore, cellular dehydration occurs, exceeding tolerance limits, rather than urea buildup, hypoxia, or disrupted ammonia production, which result from different physiological failures.

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