One of our guides personal favorites the Box Canyon Stone Nymph is a great all rounder. Know as one of the most productive flies on the famous Box Canyon area of Henry's Fork and Yellowstone regions. Bow canyon Nymph Stoneflies are just as productive in many of the other rivers and streams across Canada and the US. Deadly for a variety of species including Trout, Steelhead, Brookies and also the now sought after Carp.