Early Brown Stonefly (Protonemura meyeri)
This is abundant and widespread stonefly in high-altitude European rivers. It’s always in the same habitat as trout and grayling. It prefers cold and clean running water.
Flight period is from march to may. Although it hatches on the banks and submerged objects, it is often on the water surface, so it is one of the most interesting stoneflies to imitate with artificial dry fly.
Body length is 5 – 9 mm.