Stoneflies are given their name because they are poor fliers and are usually found climbing, rather than flying, over the stones near streams or ponds. Most of the life of the stonefly is lived in the nymph stage.
Nymphs live in a pond or stream.
The stonefly, in the nymph stage, usually lives a year. Some larger kinds or species may stay in the nymph stage for two years. The nymph of the stonefly has a flattened body with six legs held out to the side. It has long antennae and two tails sticking out of its abdomen. The largest nymphs can be 40 mm long.