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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.
Another factor influencing dissolved oxygen levels is the division between water flowing in from the ocean and out of the Bayâs freshwater rivers and streams. Water flowing from the ocean is generally salty and cooler, while river water is fresh and warmer.