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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 dissolved oxygen level can be an indication of how polluted the water is and how well the water can support aquatic plant and animal life. Generally, a higher dissolved oxygen level indicates better water quality.If dissolved oxygen levels are too low, some fish and other organisms may not be able to survive. Much of the dissolved oxygen in water comes from oxygen in the air that has dissolved in the water.Some of the dissolved oxygen in the water is a result of photosynthesis of aquatic plants. On sunny days, high DO levels occur in areas of dense algae or plants due to photosynthesis.he dissolved oxygen level can be an indication of how polluted the water is and how well the water can support aquatic plant and animal life. Generally, a higher dissolved oxygen level indicates better water quality.