Which outcome occurs when a fish's blood pH decreases following exertion near a thermal vent?

💡 Explanation

Reduced pH from exertion lowers hemoglobin affinity; the Bohr effect decreases oxygen-hemoglobin binding because hydrogen ions allosterically alter hemoglobin structure. Therefore, fish struggle to oxygenate tissues, rather than easier buoyancy control, as extreme acidity limits gas diffusion.

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