Small Winter Stonefly

Natural Habitat

Near clean, cool streams and rivers; often found on snow, bridges, or stone walls near water during winter.

Diet & Feeding

Nymphs feed on herbivorous matter like algae and decaying leaves; adults of some species do not eat at all, while others may graze on algae or lichens.

Behavior Patterns

Notable for being active during the winter. They emerge from the water to mate and lay eggs while snow is still on the ground, using glycerol in their blood to prevent freezing.

Risks & Benefits

Harmless to humans; they do not bite or sting. They are highly beneficial as bioindicators of excellent water quality and provide a vital food source for trout.

Identified on: 6/11/2026