There are countless Stonefly imitations but the Anderson's Brown Stone Nymph is just an outstanding and versatile pattern. I have used these to great success in the Great Lakes Tributaries for spring and fall run Steelheads. The feedback from our customers across North America is just the same and not just for Steelhead, Browns, Brook trout and a wide variety of Carp find the Anderson's Brown Stonefly variation irresistible.