Western March Brown




Family: Heptagenlidae

Genus: Rhithrogena

Life Cycle: incomplete

Three Life Stages: egg, nymph, adult cycle which includes 2 phases: dun and spinner

Emergence: March-May

Clinger Mayfly Group

Nymph

Nymph

Body Description

Antennae: 2 short

Head: head is wider than the abdomen

Eyes: large

Gills: large and overlapping under the abdomen forming a suction cup to help cling and move about the rocks in the fast currents

Tails: 3

Legs: 6

Body Color: olive-brown to brown

Mobility: slow swimming and floating; they drift long distances before they go to the surface

Size: 8-12mm

Hook Size: 10-14

Live in the faster current of riffles and runs in the rocks.

Dun

Dun

Body Description

Antennae: 2 short

Head: flat

Eyes: large

Wings: 2 sets, grayish and highly marked with dark brown mottling; distinguish from callibaetis because March Browns have prominent 2 nd wing while callibaetis do not

Tails: 2

Legs: 6

Body Color: top is shades of brown; bottom is shades of tan

Size: 8-12mm

Hook Size: 10-14

Spinner

Body Description

Wings: clear and heavily veined

Body Color: light to medium brown

After emerging into spinners they mate and return to the water to lay their eggs but don’t normally provide a fishable spinner fall.



Fly Fishing - The Lifetime Sport

Copyright 2014 The Gale Group, Inc. All rights reserved.
Copyright 2014 Perigee Learning LLC. All rights reserved.
lovetheoutdoors.com is owned and operated by Advameg, Inc. Copyright 2014 Advameg, Inc.