Anaerobic bacteria can only survive in oxygen-depleted environments and an overabundance of this bacteria can lead to anoxic conditions capable of causing a fish-kill.

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Anaerobic bacteria are not capable of surviving in environments with high oxygen levels. In fact, they can only survive in environments with low or no oxygen. An overabundance of anaerobic bacteria can use up the available oxygen in a body of water, leading to anoxic (oxygen-depleted) conditions which can be harmful to fish and other aquatic organisms. This can ultimately result in a fish-kill.

Anaerobic Bacteria Can Only Survive in Oxygen-Depleted Environments and an Overabundance