The Light Blue Dun Dry Fly

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The Light Blue Dun dry fly is a popular and versatile dry fly pattern used to imitate a variety of emerging mayflies, particularly those with a pale blueish cast to their bodies. Below is a breakdown of its key characteristics:

Color and Design:

  • Light blue body: The fly’s defining characteristic is a pale blue body, often obtained using dubbing materials or synthetic threads. This blue hue mimics the body color of many mayfly species.
  • Sparse hackle: A grizzly or a ginger or dun hackle is typically used, kept sparse to maintain a delicate profile that resembles the emerging mayfly’s legs and wings.
  • Tails and Wings: Variations exist, but some common options include:
    • Tails: Dun hackle fibers or dun ginger are mostly used.
    • Wings: Clear or light colored wing materials like hen hackle feathers or synthetic alternatives can be used to create a subtle, translucent wing profile. CDC started to be used in the last few years


  • Early Season Fly: The Light Blue Dun excels in imitating early season mayflies when water temperatures are cool and hatches involve pale-colored insects.
  • Matching the Hatch: By choosing the appropriate size and shade of blue, you can effectively match the specific mayflies present on your fishing grounds.
  • Stillwater and Streams: This fly can be used effectively on both stillwater and slow-moving streams where emerging mayflies might be present.


  • Color Variations: Subtle variations in the blue color of the body can be used to imitate different mayfly species.
  • Wing Materials: Some tiers prefer using CDC feathers for the wings, adding a touch of movement and improving floatability.


  • Simple Design: The Light Blue Dun’s simplicity makes it easy to tie and use, even for beginner fly tyers and anglers.
  • Effective Imitation: The light blue color and sparse profile effectively mimic emerging mayflies, making it a tempting target for trout.
  • Versatility: With some adjustments, the Light Blue Dun can be adapted to imitate a variety of mayflies, increasing its usefulness.

Overall, the Light Blue Dun dry fly is a valuable addition to any fly fisher’s box, particularly during early season hatches or when targeting fish feeding on pale-colored mayflies. Its versatility and ease of use make it a popular choice for anglers of all skill levels.

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