The March Brown Nymph is a wonderful representation of the March Brown Mayfly is also works well as a versatile lesser stonefly imitation. March Brown Nymphs are irresistible throughout Canada and the US to a wide variety of species including Steelhead, Brook Trout, Carp and Grayling. The March Brown - Nymph - is a fly tied to resemble the natural nymph state of the March Brown Mayfly nymph, which can be found frequently in the north eastern area of the United States. Can also be used as an excellent imitator of a wide variety of Stoneflies. Fishing the March brown along the bottom of your favorite hot spots is sure to provide constant action from mid-morning right through to mid day.