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A split view of a pond, showing a beetle on a reed above water and a fish below, illustrating aquatic life's dependence on water quality.
Dissolved Oxygen

What is Dissolved Oxygen and Why It's A Critical Water Quality Parameter

Sper Scientific

Fish, insects and beneficial microorganisms depend on adequate dissolved oxygen to survive. Most aquatic species require DO levels above 5 mg/L to remain healthy, and when oxygen levels fall below this range, organisms experience stress, reduced growth and weakened immune systems. Prolonged low-oxygen conditions can lead to fish kills and long-term ecosystem damage.

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