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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.
The amount of oxygen that can be dissolved in water depends on several factors, including water temperature, the amount of dissolved salts present in the water (salinity), and atmospheric pressure (Tables 1 and 2).