Why can't mayfly survive in polluted water?

Mayflies are highly sensitive to water quality, and their larvae require clean, oxygen-rich environments to thrive. Polluted water often contains harmful substances, like heavy metals and excessive nutrients, which can disrupt their growth, reproduction, and overall survival. Additionally, pollutants can reduce oxygen levels, making it difficult for mayfly larvae to breathe and develop properly. As a result, the presence of mayflies is often an indicator of a healthy aquatic ecosystem.