Which risk increases when migrating salmon transition from saltwater to freshwater habitats during spawning season?

💡 Explanation

When salmon migrate to freshwater, the external environment has lower solute concentration than their internal fluids; water influx occurs across the gills via osmosis because of high membrane permeability, causing hyperosmotic stress. Therefore hyperosmotic stress risk increases, rather than hyposmotic stress, toxicity or oxygen depletion, which represent opposing imbalances.

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