While alarming, fish kills do not always indicate that the water is polluted or unsafe for swimming and recreation. With that said, it is important to keep people and pets out of the water until you know for certain.
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The most common causes of fish kills are oxygen depletion, algal blooms (could deplete oxygen or be toxic), pesticide toxicity and disease. By far, the most common cause of fish kills is oxygen depletion in lakes or ponds.