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Trewarin t1_jabov1t wrote

Reply to comment by TheRealSmallBean in ELI5: Why is it that when fertilizers make their way into waterways, all the oxygen disappears, killing the fish? by Psychological-Dog994

There is also a lot of acid production during the phases where bacterial like organisms convert agricultural ammonia into nitrites, and then nitrates, especially if oxygenation of the waterway is low or temps high. The pH swing also kills fish rapidly

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