The Blue Quill wet fly is a classic trout pattern known for its subtle, yet effective design. This fly typically features a slender body made from blue-gray or olive dubbing, representing the quill of a mayfly. The wing is often crafted from light, soft hackle fibers, such as mallard or hen, which helps the fly mimic the natural movement of an emerging insect underwater. The hackle is usually a mix of brown and blue dun, providing a natural look. The Blue Quill is especially effective in early spring, when blue-winged olives are hatching, and can be fished in various water conditions to entice feeding trout.