Which action occurs in a fish's swim bladder when it begins to ascend quickly from ocean depths?

💡 Explanation

When a fish ascends rapidly, the reduced pressure causes gas diffusion into the swim bladder, expanding bladder volume in accordance with Boyle's law, leading to increased buoyancy pushing it upwards even faster. Therefore, gas diffusion occurs, rather than dissociation, precipitation, or active transport which are not directly related to pressure changes during ascent.

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