Realistic Mayfly Fly (CDC Extended Body)

When Standard Patterns Get Refused

In flat, slow water, trout get a long, close look at every fly before they decide whether to eat it. Standard patterns often get refused in exactly this kind of water, because the silhouette doesn’t quite hold up under scrutiny.

This Realistic CDC Extended Body Dun is built for those moments. The lightweight extended abdomen combined with CDC wings means the fly lands softly and rides high, closer to how a real insect actually sits on the water.

Why the Extended Body

Most mayfly patterns end the body right at the hook bend. Real mayflies don’t. This pattern uses a woven, extended abdomen that projects past the hook.

• Realistic Silhouette: Looking up from below, a fish sees the correct length and taper of a real body, instead of a body that stops short.
• Better Hookups: Extending the body away from the metal keeps the hook gap clear, which usually helps with hook penetration on subtle takes.

Why CDC for the Wings

The upright wings use high-grade CDC, Cul de Canard. Unlike stiff synthetic wings, CDC has natural oils that repel water, which keeps the fly floating longer without heavy floatant. The soft fibers also move slightly with the lightest breeze or current, adding a bit of life to the silhouette even in still water.

Match the Hatch

This pattern covers a range of common mayfly hatches depending on size.

Green Drakes (Size 10-12): A good match for the larger western hatches.

March Browns and Cahills (Size 12-14): A solid choice for spring and early summer evenings.

Fish this on a long, fine leader with 5X or 6X Tippet. Target slow seams where bigger trout have time to inspect a fly before eating.

Common Questions

Do I need floatant? Yes, but use a powder desiccant made for CDC, like Shimazaki, instead of a thick gel. Gel mats down the delicate CDC fibers and kills the buoyancy.

Why the extended body instead of a standard tie? It gives a larger, more realistic profile without the added weight of a bigger hook, which keeps the presentation delicate.

What’s a good dropper to pair with this? A small Pheasant Tail Nymph trailing 12 to 18 inches behind covers the subsurface angle while this fly handles the top.

Specs