Which outcome results when countercurrent exchange in fish gills is impaired near highly polluted effluent discharge?

💡 Explanation

When countercurrent exchange is impaired, reduced oxygen uptake occurs because the optimized diffusion gradient is lost, resulting in lower blood oxygen saturation. Therefore, reduced oxygen uptake is the answer, rather than increased CO2 efficiency, enhanced ammonia excretion, or elevated blood osmolality, which rely on proper gill function and membrane integrity.

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