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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 in water: Oxygen content in water is the concentration of oxygen dissolved in water. Most organisms require a minimum concentration of oxygen dissolved in water in order to survive. The oxygen dissolution in water depends on both, the temperature and the content of dissolved substances.