Western Green Drakes
.............................Fly Fishing Yellowstone National Park

Western Green Drakes - (Drunella species) - Emergers

These mayflies emerge underwater below the surface skim. I have not raised them in an
aquarium but I am told they split their nymphal shucks about midway between the
bottom and the surface. It is thought that they have a high number of cripples as
compared to other mayflies but again, I am not certain of that. Wet fly patterns that
imitate the emerging dun may be effective but I cannot attest to that either because we
have not tried them. We use the trailing shuck type fly that floats in the skim. It is very
effective so we have never had a reason to experiment otherwise.
As I previously said, the nymphs that live in fast water will migrate to the slower moving
water nearby. Those that live in the medium flowing areas of a stream hatch in the
same water they live in. The hatch only last a few days, usually from a week to two
weeks on any one stream at the most. Normally the Green Drakes hatch in the middle
of the day for about two hours.

In pocket water streams, fish the slower water on the outside edges of fast water current
seams and the inside of pockets behind boulders. They may also emerge at the ends of
long runs. We suggest making short upstream or up and across presentations.
In smooth flowing water, we recommend fishing to individual fish if you can find them
feeding in the surface skim. We stick with an upstream presentation most of the time
although a down and across presentation will also work depending on the conditions of
the smooth water streams. The current can be very deceptive. An uneven bottom and
grass beds can create some very complex currents. It is best to keep you cast short as
you can without spooking the trout.

Coming Up Next:
Western Green Drake - Duns

Copyright 2008 James