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

07/01/09

Fly Fishing Yellowstone - Green Sedge Pupa

The Green Sedge forms a pupa before it hatches into a full grown fly but for
most of its life it exist as a Rock Worm. The pupa is only important to imitate just
prior to the hatch. The the problem is determining when the hatch is underway.
The different species can hatch at different times of the year. They hatch off
and on (different species) over a very long period of time. There may be periods
that the hatches of the different species overlap with one another and there also
are periods of time when none of them are hatching during long hatch periods
we show on our hatch charts. The problem with this is that you really never know
when to expect them. You just have to notice them when they are hatching and
thats the big problem.

It is difficult to determine a hatch is occurring before it is to late to do you any
good. By the time you start seeing the Green Sedge adults on the banks and
bushes, it may be too late to fish the hatch. You cannot easily spot the caddis
eating the pupa. Often all you will see is a flash of the trout eating the larvae
beneath the surface. At times you will see the trout jump completely out of the
water. Often this is when they are after a pupae accenting to the surface. At the
point the hatch ends, your only opportunity is to imitate the egg layers. The very
first time you see a Green Sedge on the banks in the trees, bushes or grass,
you should start carefully watching the water. If you can see any caddisflies
departing the water you should try fishing an imitation of the pupa. It is usually
much more effective than the adult fly during the hatch. The adult works best
during the egg laying activity. These caddisflies depart the water very quickly.

Presentation:
Try to position yourself above the area the caddis are hatching in. Often, it is far
to large an area. Just make sure you stay upstream of where you want to fish.
The best way to fish the pupa fly is to cast down and across. Mend the line a
couple of times to help get the fly down.  Let out some line to allow the fly to go
a good distance downstream. You may want to add some non-toxic weight a few
inches above the fly. Let it go down near the bottom before it reaches the end of
the drift. Stop the rod at about the 11:00 AM position and allow the fly to rise
back to the surface with the current. Let it remain on the surface for a few
seconds and repeat the process to let the fly rise in a slightly different spot.  
The idea is to imitate the pupae rising from the bottom to the surface to hatch.