Overview
Excellent pattern for many light colored mayflies including, Pale Morning Dun, Red Quills, Pale Evening Duns, Pale Watery Duns, and Spur Wings.
Along with Adams, the two most versatile mayfly patterns around.
A must have for every trout angler.
A beautiful fly, woodduck wings make it a very effective strike inducer.
| Pattern Type | Light mayfly |
|---|---|
| Key Species | Pale Morning Dun, Red Quills, Pale Evening Dun, Pale Watery Dun, Spur Wings |
| Material | Woodduck wings |
| Use Case | Trout fishing |
FAQ
What types of mayflies does the Barbless Light Cahill pattern work best with?
The Barbless Light Cahill works best with light-colored mayflies such as Pale Morning Dun, Red Quills, Pale Evening Duns, Pale Watery Duns, and Spur Wings.
Is the Cahill pattern effective for inducing strikes?
Yes, the woodduck wings make it a very effective strike inducer.
How does the Cahill compare to the Adams pattern?
The Cahill and Adams are considered the two most versatile mayfly patterns and are often used together in trout fishing.

Wendy Campbell –
This fly performs well in clear water streams. The woodduck wings add natural movement and attract trout easily. I’ve used it with Pale Morning Dun imitations and got consistent strikes.
Fiona Scott –
Great for light mayfly patterns. The wings are durable and the fly floats well. Works well in early morning when trout are active.
Donna Marshall –
I’ve fished this with both Red Quills and Pale Evening Duns. It’s one of my go-to patterns for dry fly fishing on slow-moving rivers.