Which risk increases for freshwater fish exposed to increased ambient salinity beyond osmoregulatory capacity?

💡 Explanation

When ambient salinity exceeds the fish's osmoregulatory capacity, osmotic pressure draws water out of cells via osmosis, because the external environment has higher solute concentration leading to cellular dehydration. Therefore cellular dehydration increases, rather than mucus production, calcification, or potassium disruption, which require different ionic imbalance mechanisms.

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