Oxygen is an important requirement which must be available at optimal levels for proper holding conditions.
Oxygen level varies with water temperature. As the temperature raises the oxygen holding capacity drops. When water holds all that it can at a given temperature it is said to be saturated as in the natural environment.
At 32° F saturated sea water contains 12 ppm (parts per million) oxygen but at 77° F it contains 7 ppm. The oxygen concentration of the storage system should be kept at or near saturation level.
To maintain lobster health dissolved oxygen below 3 mg/l should be avoided at all times.
The critical control points at which alarming occurs can be adjusted by the operator.