Which adaptive advantage results from precise swim-bladder volume regulation in bony fish during vertical migration?

💡 Explanation

When bony fish vertically migrate, precise swim-bladder volume regulation occurs through gas secretion/absorption because it adjusts buoyancy to match water density changes, minimizing energy expended against gravity. Therefore energy expenditure is minimized, rather than camouflage, reproduction or avoidance which rely on different physiological mechanisms.

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