Dry FliesBWO Thorax
The BWO Thorax is a classic dry fly pattern that's been fooling trout for decades. This fly is designed to imitate a Blue Wing Olive mayfly, which are prolific in many rivers and streams.
Spring, Fall
Intermediate
Trout
Overview
Tied to sit flush in the surface film, the BWO Thorax features an upright parachute-style hackle and a thorax-heavy body. Use a fine synthetic or natural dubbing for the body, a sparse tail (typically microfibbets), and a parachute post with grizzly hackle wrapped horizontally. Keep the thorax slightly bulkier to simulate the natural's proportions.
Pattern Characteristics
Materials
Hook: Tiemco 100, size #18–#22
Thread: Olive UNI-Thread 8/0
Tail: Coq de Leon fibers
Body: Olive superfine dubbing
Wing: Dun CDC feathers
Hackle: Grizzly rooster hackle
Fishing Tips
Season
Spring, Fall
Presentation
Cast upstream and let the fly drift naturally with the current. Try to match the speed of the natural bugs on the water.
When to Use
During a BWO hatch when trout are feeding on the surface.
Water Type
Primarily moving water.
Rigging Suggestions
Tie this on using a standard clinch knot.
Visibility & Floatation
The CDC and hackle help this fly to float. The fly sits low in the water, mimicking a struggling mayfly, which makes it highly visible to feeding trout.
