The muskrat dubbed nymph on a size 12 with just a touch of grizzly is the most deadly fly I have ever used. The fur is dubbed after removing the guard hairs and finding the blueish dense fur. This fly is irresdesant and is especially effective o a full moon wherever there are fresh water shrimp. I used to catch large humpback bows in Herman and Pit and Quail before it became a selctive fishery for Atlantic Salmon.