Montana Fly Co.'s Biot Sparkle Dun in Mahogany is a #16 mayfly dun dry fly with a segmented biot body and a trailing shuck that imitates an emerging dun still breaking free of its nymphal skin. The mahogany colorway matches the dark reddish-brown duns trout key on during a hatch, and the low-riding profile sits in the surface film where selective trout feed. Fish it on the surface during a mayfly hatch, in riffles, runs, and slow seams — the #16 size fishes well as a single dry or behind a larger attractor. A go-to dun when trout are rising to emergers.
