Dry FliesPetitjean CDC May Fly
The Petitjean CDC May Fly is an elegant mayfly dun imitation developed by Swiss fly tying master Marc Petitjean. The pattern showcases his signature CDC techniques, using a twisted Coq de Leon body and split-thread CDC wing that creates exceptional floatation and a realistic silhouette. A masterclass in minimalist dry fly design that rides high on the water.
Spring, Summer, Fall
Advanced
Trout
Overview
Marc Petitjean revolutionized CDC fly tying with his innovative techniques and specialized tools, including the famous MP Magic Tool. This pattern demonstrates his signature "one twist per wrap" method that prevents the delicate CDC fibers from breaking while creating a beautifully segmented body. The split-thread dubbing loop technique for the wing is a Petitjean hallmark that creates maximum floatation with minimal material. His patterns are renowned for their effectiveness on technical spring creek trout.
Pattern Characteristics
Materials
Hook: Dry fly hook, #12–#18
Thread: Fine tying thread, color to match body
Tail: Coq de Leon fibers
Body: Coq de Leon hackle, twisted and wrapped
Wing: Three CDC feathers, mixed colors, split-thread technique
Fishing Tips
Season
Most effective during mayfly hatches from spring through fall. Particularly productive during morning and evening dun emergences when trout are keyed in on the surface.
Presentation
Cast upstream or up-and-across with a drag-free drift. The CDC wing provides excellent floatation without additional treatment. Focus on presenting the fly in the trout's feeding lane with minimal disturbance.
When to Use
Best during active mayfly hatches when fish are rising to duns. Effective in clear water conditions where trout are selective. The realistic silhouette excels when standard patterns are refused.
Water Type
Ideal for spring creeks, tailwaters, and smooth-flowing pools on freestone streams. The delicate presentation works best in slower, clear water where trout have time to inspect the fly.
Rigging Suggestions
Fish on a 9-12 foot leader tapered to 5X-7X tippet depending on conditions. Long, fine leaders are essential for fooling wary fish. No split shot or indicators needed.
Visibility & Floatation
Floats high in the surface film with the CDC wing providing natural buoyancy. The Coq de Leon tail and body give a realistic mayfly profile. Avoid applying floatant directly to CDC as it can mat the fibers.
