How can pollution affect the level of oxygen in waterwhy is this important?

Pollution, particularly from organic waste and nutrient runoff, can lead to algal blooms that deplete oxygen levels in water through a process called eutrophication. When algae die and decompose, the decomposition process consumes dissolved oxygen, creating hypoxic or anoxic conditions that are harmful to aquatic life. Adequate oxygen levels are crucial for the survival of fish and other aquatic organisms, and their decline can disrupt ecosystems and lead to fish kills. Maintaining oxygen levels is essential for biodiversity and the overall health of aquatic environments.