Harrop’s CDC Biot Dun Mayfly Dry Fly
Harrop’s CDC Biot Dun from Solitude Flies is a Mayfly Dry Fly designed by René Harrop to imitate emerging or freshly hatched mayflies. This realistic pattern features a slim, segmented biot wrapped body that stands up to inspection by picky trout in calmer waters. The buoyant CDC feather wing gives this fly a more subtle, natural profile.
- Classic René Harrop pattern
- Mayfly dry fly with subtle profile
- For trout and other freshwater species
- Sold individually
| Feature | Detail |
|---|---|
| Pattern Type | Dry Fly |
| Imitation | Emerging or freshly hatched mayflies |
| Body Material | Biot wrapped |
| Wing Material | CDC feather |
| Target Species | Trout and other freshwater species |
| Shipping | Within Canada only |
FAQ
What type of water conditions is this fly best suited for?
This fly is ideal for calmer waters where trout are more selective and attentive to subtle, natural profiles.
Is the CDC wing adjustable or does it come fixed?
The CDC feather wing is fixed and provides a natural, buoyant profile that mimics real mayfly wings.
Can this fly be used for species other than trout?
Yes, it is suitable for other freshwater species that feed on mayflies.

Gordon MacDonald –
The Harrop’s CDC Biot Dun looks very realistic and matches well in slow-moving streams. My trout caught on it during a calm morning session. The CDC wing adds a natural float that makes it stand out without being flashy.
Piers MacLeod –
I’ve used this fly in several different streams and it performs well in still water. The body shape is accurate and the fly holds up well under inspection. A solid choice for dry fly fishing.
Michelle Newman –
Great detail in the pattern. The biot body and CDC wing give it a subtle, lifelike appearance. I caught a large brown trout on this fly during a late spring outing.