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RedditOR74 t1_jadidze wrote on February 28, 2023 at 5:35 PM

Reply to comment by GeorgeCauldron7 in ELI5: Why is it that when fertilizers make their way into waterways, all the oxygen disappears, killing the fish? by Psychological-Dog994

Algae does both. During the day it contributes highly to oxygenating the water, but it consumes it at night. Since it also limits he surface area to replenish the oxygen, the water goes anaerobic during night time.