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Fishkills happen. The school gets ino a confined area and there are so many they deplete the oxygen themselves. could happen even if the waterhad plenty of oxygen when the schhol came in.
I once saw one where so many bunker came in and oxygendropped so low that the crabs climbed out of the water to get some air. of course the fish all died.
anyway , i think a fishkill like this is normal and not at all related to water pollution
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