Split Case Mayfly Nymph

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Split Case Mayfly Nymph fly pattern - Mayfly nymph image

Description

The Split Case Mayfly Nymph, developed by Joe Mitchell of Heber City, Utah, is a highly effective pattern designed to imitate mayfly nymphs during their emergence. The distinctive split wing case, often crafted with black goose biots and a contrasting foam wing bud, mimics the natural splitting of the wing case as the nymph prepares to hatch—a visual trigger that entices trout.

Curated by the IdentaFly fly fishing team.

Pro Tip

Tie behind a dry fly about 1/2 the depth of the water to keep the emerger higher in the column and more natural. A Parachute Adams works well for the Dry Fly.

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Mayfly
emerger

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Fly Tying Recipe

  • Hook: #16 standard nymph
  • Thread: 8/0 brown Uni-thread
  • Tail: dyed mallard flank, yellow
  • Body: dark brown Life Cycle dubbing
  • Wing Case: Nymph Skin, black
  • Wing Case Outer: goose biot, yellow
  • Thorax: same as body

Fly Tying Video

From: Unsung Angler