Dissolved oxygen (DO) is crucial for good water quality because it is integral to various biochemical processes that occur in aquatic environments. Organisms like fish, invertebrates, and microorganisms require dissolved oxygen for respiration. In addition to supporting the survival of aerobic species, DO plays a vital role in the breakdown of organic matter, which is essential for maintaining the ecological balance in water bodies.
The presence of adequate levels of dissolved oxygen indicates a healthy aquatic system, where natural processes such as decomposition, nutrient cycling, and energy flows can occur efficiently. Moreover, DO affects the solubility and mobility of nutrients and pollutants in the water, directly influencing water quality. Ensuring sufficient levels of dissolved oxygen is important not only for aquatic life but also for maintaining overall ecosystem health.