Dry FliesCDC Biot Thorax Dun
The CDC Biot Thorax Dun is a highly effective and life-like mayfly imitation. CDC (Cul de Canard) provides this fly with a realistic profile and excellent buoyancy. The biot body perfectly mimics the segmented body of a natural dun, making it an irresistible choice for trout during a hatch.
Spring, Summer, Fall
Advanced
Trout
Overview
This variation features a biot body for segmentation and a CDC thorax or collar for buoyancy and subtle motion. A sparse, upright wing helps it ride flush in the film. It's an effective pattern during light hatches or when fish are selective on mayfly duns.
Pattern Characteristics
Materials
Hook: Tiemco 100, size #12-#20
Thread: Olive Dun 8/0 Uni-Thread
Tail: Coq de Leon
Body: Olive goose biot
Wing: Natural gray CDC feathers
Thorax: Olive superfine dubbing
Fishing Tips
Season
Spring, Summer, Fall
Presentation
Use a drag-free drift to present the fly naturally on the surface of the water. You can also give the fly a slight twitch to imitate a struggling dun.
When to Use
Use the CDC Biot Thorax Dun during a mayfly hatch. It can be particularly effective in the evening when duns are most active.
Water Type
This pattern is best suited for moving water such as streams and rivers.
Rigging Suggestions
Use a light tippet to prevent spooking fish in clear water. Apply floatant to the CDC to keep the fly riding high on the water surface.
Visibility & Floatation
The CDC feathers provide excellent buoyancy and the segmented biot body makes this fly highly visible on the water surface. The natural colors of the materials blend well with the surrounding environment, fooling wary trout into taking a bite.
