.......................  ....................  ...Fly Fishing Yellowstone National Park
New KISS Bug Series - Part 45

Western Green Drake

The Western Green Drake nymphs are crawlers that for the most part are readily available for the trout to
eat year-round. Crawlers are not as good at hiding from the trout as the clingers or burrowers. Only the
swimmers are as exposed as the crawlers. These nymphs are also large enough that they cannot get into
the tight places many smaller nymphs can get. They do quite well where there is a cobble bottom but
otherwise, they are exposed much of the time. All of this is to say that fishing an imitation of a Green Drake
nymph is not a bad idea anytime of the season, except of course, right after the two species have finished
hatching. At that time they will only be eggs for a while and then change to tiny nymphs later on. That said,
the absolute best time to fish an imitation of the Green Drake nymph is a week or two before the hatch. At
that  point in time, the nymphs are readily exposed and eaten by the trout. Trout eat the nymphs up until
they emerge into duns in the surface skim.

Many anglers think they have to have a good imitation of a mayfly dun, yet pay little attention to the
nymphs they fish. In reality, this is just exactly backwards to what it should be. The trout can see the
nymphs far better than they can see the duns the few seconds they are drifting on the surface. They get a
distorted view of the duns depending on exactly where it appears in their window of vision of objects above
the surface of the water. Good imitations of nymphs should look and behave like the real nymphs. We feel
like our Perfect Flies, which have specific imitations of all the major nymphs trout eat, do a much better job
of this than anyone's. The facts are, there's very few specific imitations of mayfly nymphs that exist on the
commercial fly market.  

The Green Drake nymphs are usually found in moderately fast to moderate flowing water. Like most
crawler nymphs, prior to emerging they migrate to the calmer sections of the stream. This movement is
usually just a few feet at the most. They could move to pockets in pocket water streams or calmer areas
along a bank in smooth flowing streams.

There's some difference in the
Drunella dodsi and grandis species of the Western Green Drake nymphs
but not enough to make any difference in the way they are imitated, or in the appearance of the fly you use
to imitate them. The only real notable difference worth noting is that the
doddsi nymphs prefer colder,
faster moving water. The
grandis species are usually found in slower water  than the dodsi.. Both can and
usually do exist in the same streams. The
doddsi nymphs tend to move more just prior to the hatch than
grandis species. They will move from their fast water habitat to slower moving water before emerging to
hatch. The grandis species usually hatch in the slower areas of the moderate flows they live in.
Copyright 2012 James Marsh
Western Green Drake
Availability to trout:             
Hook Size:                          
Type of water:                    
Emergence time:                
Duration of hatch period:

Drunella dodsi and grandis species
Most all moderate speed water streams
Early Afternoons