why do fish need dissolved oxygen?
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Dissolved oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms. Oxygen dissolves in surface water due to the aerating action of winds. ... When dissolved oxygen becomes too low, fish and other aquatic organisms cannot survive.
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Fish need dissolved oxygen because fish do not have lungs. They breathe through gills which cannot absorb elementary oxygen.
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