Description
The Isonychia Nymph, often attributed to the innovative fly-tying work of anglers like Art Flick, is a classic pattern designed to imitate the nymphal stage of the Isonychia bicolor mayfly. This mayfly, commonly known as the Slate Drake or Mahogany Dun, is renowned for its robust swimming nymphs that are a staple in trout diets. The pattern features a realistic segmented body and prominent legs, making it an excellent attractor for opportunistic trout throughout its active hatch season.
Pro Tip
At the end of the drift, allow the fly to rise in the water column, mimicking an emerging nymph heading to the surface—a movement that can trigger aggressive strikes.
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Recipe
Hook: Tiemco TMC 5262, sizes 10–14 Thread: Black or dark brown Tail: Moose body hair or dark brown fibers Body: Pheasant tail fibers ribbed with copper wire Thorax: Dark hare’s ear dubbing Legs: Brown or partridge hackle fibers tied short and sparse Wing Case: Dark turkey quill or synthetic film