Which outcome occurs when a fish with a physoclistous swim bladder rapidly ascends in the water column?

💡 Explanation

When a physoclistous fish ascends rapidly, the swim bladder volume increases due to decreased external pressure, but these fish lack a pneumatic duct to release gas quickly, causing overexpansion and possible rupture. Therefore bladder rupture results, rather than oxygen exchange, carbon dioxide release rates or increased buoyancy control, which involve different gas exchange and diffusion mechanisms.

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