Which outcome occurs when gill filament spacing decreases significantly in a fish species?

💡 Explanation

When gill filament spacing decreases, diffusion distance lowers which disrupts countercurrent exchange mechanism because water and blood flow too closely thus failing to maintain an oxygen concentration gradient, lowering diffusion. Therefore reduced oxygen uptake results, rather than enhanced CO₂ excretion, ammonia diffusion, or blood pH due to inefficiencies.

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