Both adults and larvae live primarily in cold, running streams and rivers. The larvae live on the bottom of streams and rivers. A few species prefer the gravelly shores of mountain lakes where there is a lot of wave action. Each species of stonefly lives in its own special habitat, including rocky bottoms, in spaces among loose gravel, piles of waterlogged leaves and debris, or on submerged logs. Adults are found during the day resting on vegetation, rocks, and debris along running waters. They are sometimes attracted to lights at night.
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