Which outcome is most likely for a freshwater fish experiencing chronic nitrate pollution?

💡 Explanation

Chronic nitrate pollution leads to increased ammonia production by the fish because the waste detoxification mechanism requires higher nitrogen input, disrupting osmoregulation and forcing the kidneys to work harder to excrete excess water entering the body. Therefore, kidney damage results, rather than gill disruption, reduced metabolism, or muscular failure, which would stem from alternative stressors.

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