In this regard, can dissolved oxygen be too high?
Too much dissolved oxygen is not healthy, either. Extremely high levels of dissolved oxygen usually result from photosynthesis by a large amount of plants. Great uncontrolled plant growth, especially algal blooms, is often the result of fertilizer runoff. This phenomenon is called cultural eutrophication.
Additionally, what causes high levels of dissolved oxygen? Cold water can hold more dissolved oxygen than warm water. In winter and early spring, when the water temperature is low, the dissolved oxygen concentration is high. In summer and fall, when the water temperature is high, the dissolved-oxygen concentration is often lower.
Secondly, what is a good level of dissolved oxygen?
Water at lower temperatures should have higher mg/L of dissolved oxygen and higher %DO while warmer, polluted waters will have lower mg/L and %DO. Healthy water should generally have dissolved oxygen concentrations above 6.5-8 mg/L and between about 80-120 %.
What happens if dissolved oxygen is too low?
When dissolved oxygen becomes too low, fish and other aquatic organisms cannot survive. Oxygen levels also may be reduced when there are too many bacteria or algae in water (see Biochemical Oxygen Demand). After the algae complete their life cycle and die, they are consumed by bacteria.
