Which process allows bony fish to maintain buoyancy using their swim bladder as they swim to different depths?

💡 Explanation

When bony fish change depth, gas is secreted or absorbed from the blood into the swim bladder via the rete mirabile using countercurrent exchange, changing the swim bladder's volume and thus the fish's buoyancy. Therefore diffusion is regulating buoyancy, rather than muscle contraction, osmotic pressure, or lipid modification, which involve different physiological processes.

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