
Description
The Morrish Anato-May, designed by Ken Morrish for RIO, is a versatile and highly effective fly pattern that replicates the mayfly nymph in its most natural state. This fly is a combination of a classic mayfly nymph profile and modern materials, designed to mimic the anatomical features of the mayfly nymphs that trout feed on. The fly’s slender body and realistic tail are tied using premium materials to ensure lifelike movement and durability.
Curated by the IdentaFly fly fishing team.
Pro Tip
Strategic Use of Weighted Rigs in High-Pressure Water: In heavily pressured waters, subtlety becomes critical. Pair the Morrish Anato-May with a smaller, more realistic nymph as the dropper, especially when fish are highly selective. The Anato-May’s attractor qualities, combined with the natural-looking trailing fly, mimic a range of prey in varying stages of emergence
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Fly Tying Recipe
- Hook: Tiemco 2487 or Mustad 3906B, size 12-16
- Thread: UTC 70 Denier, olive, brown, or tan
- Body: Dubbing (olive, brown, or tan) to mimic the mayfly nymph body
- Ribbing: Fine copper or gold wire for segmentation
- Tail: Pheasant tail fibers for a realistic tail
- Bead: Tungsten bead (size 3.5 mm or 4 mm) for quick sinking
- Legs: Optional, fine hackle fibers or CDC


