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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.
Oxygen gas dissolved in water is vital to the existence of most aquatic organisms. Oxygen is a. key component in cellular respiration for both aquatic and terrestrial life. The concentration of. dissolved oxygen, DO, in an aquatic. environment is an important indicator of the. environmentâs water quality.