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The Irish Mayfly Dun Nature’s Most Famous Hatch

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Materials Used;

Hook, Fulling Mill All-Pupose Medium size 10
Thread, Uni-8/0 Chartreuse
Tail, Dyed Olive Badger Hair or Grey Squirrel
Rib, Fulling Mill Pro Floss Flu-Yellow
Body and Thorax, Dyed Olive Rabbit
Wing, Dyed Deer Hair Dark and Light Olive

The Irish Mayfly Dun is a famous stage of one of the most important aquatic insects in fly fishing—especially in Ireland.
???? What it is
The Irish Mayfly Dun refers to the subimago (immature winged stage) of the mayfly species
→ Ephemera danica (often called the “Green Drake” in the UK & Ireland).
“Dun” = the stage when the mayfly first emerges from the water with dull, opaque wings.
???? Where it’s found
Particularly abundant in Irish limestone loughs such as:
Lough Corrib
Lough Mask
Lough Sheelin
These waters are world-famous for mayfly hatches.
⏳ Lifecycle (simplified)
Nymph (underwater, can live 1–2 years)
Dun (emerges, floats briefly on surface) ← this is the “Irish Mayfly Dun”
Spinner (fully mature adult that returns to mate)
???? Why anglers care
The dun stage is when trout feed aggressively on the surface.
It triggers the legendary Irish “Mayfly hatch” (usually May–June).
Fly anglers imitate it with patterns like:
Green Drake dries
Mayfly dun patterns
Category
Steelheads
Tags
Fly, Tying, Lessons

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