.............................Fly Fishing Yellowstone National Park


I am calling this series Yellowstone Journals and Additional Information. It is a collection of a
rambling mixture of experiences on the streams with some notes, tips and additional
information thrown in. Some of this comes from my video tape logs (record of video shot)
and  notes made on my daily note books.

Fly Fishing the Upper Madison - Part 8

As mentioned before, there are also hatches of different species of Green
Sedges, from the
Rhyacophila genus. These don't usually hatch in huge
quantities but the different species hatch off and on from about the first of July
through the rest of the season. The thing that makes these species of
caddisflies important is the larva stage, or the stage of life they reside in for
most of their life. These larva are called "Rock Worms" and sometimes "Green
Rock Worms". They are free-living caddis larvae and are available for the trout
to eat most anything. They do not live in cases.

For the most part, these caddisflies prefer the faster moving water or the riffles
and runs. Hatches tend to be sparse and isolated to the faster water areas of
the Madison River. As I said before, it is rare that you cannot catch trout on the
dry fly during the short Yellowstone fly fishing season, but if you are having
trouble you can usually pick up a few fish using imitations of the larvae of this
caddisfly. We usually add some non-toxic weight a few inches above the fly and
present it up and up and across concentrating on the channels and areas clear
of grass. You can use a strike indicator with this fly but we just watch our line
and leader to detect strikes.

If you happen to see the Green Caddisflies hatching, you would want to switch
to an imitation of the pupae. We fish it down and across in the riffles. You should
mend the line as soon as the fly hits the water and get it down as much as
possible. Stop the movement of the rod tip and allow the fly to swing around and
come back to the surface much like you would fish a soft hackle fly.

The Green Sedges will deposit their eggs late in the afternoons and into the
evenings. The main difference these species and the Spotted Sedges is that
these caddis deposit their eggs only in the riffles and faster water.

You would fish the adult fly late in the day after the sun has set and into the
evening in the same type of water they hatch in. We use short up and up and
across presentations in the riffles and the ends of the long runs. The real egg
layers should show you where you need to put the fly. If you are not seeing any
Green Sedges depositing their eggs, you shouldn't be fishing the fly.

Copyright 2009 James Marsh
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