Description
The Thorax Dun was popularized by legendary angler Vincent Marinaro in the mid-20th century as part of his groundbreaking approach to imitating mayflies with precision. Designed specifically to fool selective trout feeding on emerging or freshly hatched duns, this pattern revolutionized dry fly fishing with its innovative use of hackle to create a low-floating, lifelike silhouette on the water's surface.
Pro Tip
Use it during calm hatches on smooth water; the flat hackle helps mimic the surface tension disturbances caused by a natural dun, enticing even the most wary trout.
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Recipe
Hook: Tiemco TMC 100 or Daiichi 1180, sizes 12–20 Thread: 8/0 or 70 Denier, color to match the natural Tail: Microfibbets or split tail fibers, medium dun or brown Body: Fine dubbing or turkey biot, in colors like olive, tan, or gray Wing: Upright wing of light dun CDC or poly yarn Hackle: Dry fly rooster hackle, color to match the natural