Dissolved OxygenDissolved Oxygen means the amount of oxygen gas dissolved in water. | ||
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Studies suggest that 4.5 mg/L dissolved oxygen is the minimum amount needed to support a large and diverse fish population. Dissolved oxygen is essential for the respiration of fish, aquatic animals, micro-organisms and plants.
Light levels and temperature affects the dissolved oxygen levels. During the day, plants produce more oxygen than they consume through photosynthesis. |
At night, plants use up more oxygen than they produce through respiration. Therefore, you must record the time of day you record your sample. Readings range between excellent > 80% to poor < 40%. | |