BH Prince Nymph
The Prince Nymph is a highly effective, subsurface "attractor" wet fly used in fly fishing, originally developed in the 1930s by Doug Prince of Oakland, California. Though it does not perfectly mimic any specific insect, its contrasting colors and profile effectively suggest mayflies, stoneflies, and caddisflies to trout. It has been said that no fly angler should go about without a few of these in their fly box.
