This fly was originated by Adam Trina, founder of Montana Fly Company and former Missoula, Montana-based guide. Much of the pattern is based upon the Pheasant Tail Nymph. Adam used Krystal flash to create a loopwing that represents the splitting wing case of an emerging insect.
The Bubbleback Emerger is a highly effective nymph that makes an excellent dropper off a dry fly, or as a trailer behind a heavier nymph. In either case, it is better fished in the middle of the water column as opposed to hovering off the bottom.