Which mechanism reduces hydrostatic pressure effects on deep sea fish swim bladders when ascending?

💡 Explanation

When a deep-sea fish ascends, the decreasing hydrostatic pressure causes the gas in its swim bladder to expand; a pneumatic duct allows controlled release of this excess gas, preventing over-inflation. Therefore, duct gas reduction mitigates pressure effects, rather than gas uptake which would worsen it, or ion/cutaneous adaptations.

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