Which mechanism causes swim bladder volume to fluctuate in deep-sea fish undergoing vertical migration?

💡 Explanation

When vertical migration occurs, the hydrostatic pressure changes dramatically, causing the gas secretion rate from the blood into the swim bladder to adjust through the gas gland, maintaining neutral buoyancy. Therefore, gas secretion rate changes are the primary mechanism, rather than muscular compression, osmotic diffusion, or metabolic nitrogen increase which have less direct control.

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