zaphrous t1_ja9w9d2 wrote
Reply to comment by Psychological-Dog994 in ELI5: Why is it that when fertilizers make their way into waterways, all the oxygen disappears, killing the fish? by Psychological-Dog994
You can aerate water. This happens naturally where air meets water. You can do it more quickly by spraying the water in the air like a fountain. So a fountain can keep pond fish alive. Or you can use a pump to make bubbles underwater. So probably a waterfall would be the best natural way to get oxygen back into the water, but rough waters would also work well.
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