Small Winter Stonefly

Near clean, cool streams, rivers, and lakes with rocky substrates; often found on snow or near water surfaces.

Larvae (nymphs) feed on decaying vegetation, algae, and detritus; adults often do not feed or may consume algae/lichens.

They are unusual for being active during late autumn through early spring. Adults emerge from the water in winter to mate on the snow or nearby structures. They are sensitive to pollution.

They pose no risk to humans as they do not bite or sting. They are beneficial indicators of good water quality and are a vital food source for trout and other fish.