Which function is most DIRECTLY impaired when a fish's gill lamellae spacing decreases substantially due to sediment accumulation?

💡 Explanation

When gill lamellae spacing decreases, countercurrent exchange efficiency declines because reduced water flow disrupts the oxygen gradient between water and blood. Therefore, oxygen uptake plummets, rather than buoyancy control, osmotic balance or predator detection which are affected by separate organ systems and physiological mechanisms.

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