I saw this happen in I believe Clinton, CT. There was so little oxygen the crabs were climbing the pilings and onto shore to breath. Of course the fish don't have that luxury.
They say sometimes its just too many fish but sometimes its because of a combination of too many fish and something happening to reduce the oxygen level. One culprit I believe is if a heavy rain washed fertilizer or soap or some organic mold or whatever into the water. Sometimes the fertilizer results in a big algae bloom and the algae suck up the oxygen. I believe the term is COD or BOD (Chemical or Biological Oxygen Demand). It goes very high and the fish suffocate.
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