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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.
In a lake, a good balance of oxygen and carbon dioxide is just as important. Who Needs Oxygen. Dissolved oxygen, also called DO, is vital to the health of aquatic habitats. Plants and animals need oxygen to survive. A low level of oxygen in the water is a sign that the habitat is stressed or polluted.