Reel Stone Double Bead Head Black Stone Nymph - Bead Heads, works best in well oxygenated rivers and streams. Time after time the Double Bead Head Black Biot Stonefly Nymph has brought fish to the bank. Imitates the Salmonfly nymph (Pteronarcys californica) One of my personal favorites. The Double Bead Head Black Biot Stonefly is one of the most deadly fly and float fishermen patterns. Productive in most rivers and lakes across Canada and the US. I have fished these nymphs in a variety of colors on most of the Great Lakes tribs including the Maitland, Nine Mile and Bayfield. This fly will catch just about every species that swims including Bass & Carp but for Steelhead it is just incredible. The Double Bead Head Black Biot Stonefly should be fished close to the bottom so you will loose a few so stock up on these incredible imitations, you just won't regret it.