March Brown (vicarium) Ephemeroptera(Mayfly) Family: heptogeniidae Genus: stenonema Species: vicarium Common Name: March Brown Important vicarium Statistics Size: 14-16 mm Water Temp: Hook: #10 2x Emerging: sporadically all day Hatch Date: last of May into early June(Catskills) Habitat: Fast water, rapids and runs SPECIES LIFE STAGE HOOK BODY COLOR WING COLOR TAIL COLOR vicarium dun #10 2x brownish medium texture brown mink vicarium spinner #10 grizzly hackle or clear antron vicarium emerger #10 brown antron March Brown Comments: Nymph Nymphs move from their fast water habitat to adjacent slower shallows. A weighted nymph fished on the bottom with motion is effective until the hatch begins. During the hatch, use an un weighted nymph fished in the surface film. Emerger Fish in the surface film during early hatch. Dun These heavy mayflies float on the surface for long distances struggling to get airborne. The presentation should mimic this behavior. Choose an advantageous route to wade that allows casting to all parts of the stream including the very shallow water. Spinner Spinner activity occurs before dusk. Hackled and full spent patterns work very well. Mayfly |Entomology |Trout |flyfishing copyright©2000flyfisherusa