This mayfly collected from a local creek typically indicates good water quality since these insects require clear well-oxygenated water to thrive. Mayflies lay their eggs in water. After hatching, mayflies enter their nymph stage and spend a portion of their life in waterbodies like our local creeks. At the end of their life cycle, they emerge from the water and molt their skin, transforming into winged creatures that mate and die soon afterwards. Fish like to feed on mayflies, and artificial lures based on mayflies are popular for fishing.