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For an updated and comprehensive look at DO and the technology used to measure it, check out: Dissolved Oxygen, or Measuring Dissolved Oxygen. Dissolved oxygen in water is vital for underwater life. It is what aquatic creatures need to breathe. Dissolved oxygen is often called DO for short.
Section Overview. 1  What is Dissolved Oxygen. 2  Dissolved Oxygen and Aquatic Life. 3  Where Does Dissolved Oxygen Come From.  Dissolved Oxygen 1  Saturation. Typical Dissolved Oxygen Levels.  Consequences of Unusual Dissolved Oxygen 1  Levels. Dissolved Oxygen and Water Column Stratification.  Dissolved Oxygen Units of Measurement.