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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. As most people know water is a molecule made from two hydrogen atoms and one oxygen atom (H2O). The oxygen which forms part of the molecule is not available to fish to breathe, only dissolved oxygen (DO) is available to the aquarium or pond inhabitants.The amount of dissolved oxygen is affected by several things: 1  Air pressure.2  Salinity. 3  Temperature.f the level of dissolved oxygen falls to far below this the fish will be seen gasping at the surface in order to get at the oxygen as it is dissolved. Below is the level; of dissolved oxygen in clean fresh water at ground level. 1  Temp 0Â°C (32Â°F) - 14.6mg/l of dissolved oxygen.