|....................... ......Fly Fishing Yellowstone National Park
Fly Fishing Yellowstone -Yellow Quill
The Yellow Quill (Epeorus albertae) is found in fast to moderately flowing water.
It is plentiful in several rivers inside Yellowstone National Park and surrounding
streams such as the Madison River. It is also called the Slate Brown Dun, a
similar mayfly but the Slate Brown Dun is the Epeorus longimanus. Its also
occasionally called the Slate Dun. The female dun is called the Pink Lady. The
most important thing about this mayfly is that it tends to hatch when few other
mayflies are hatching. Normally, caddisflies are about the only aquatic insects
that are available at the time it hatches.
The Yellow Quills emerge in the late afternoon. It can hatch anywhere from the
first week or two of August until the second week of September depending on
the weather and the elevation of the stream. Regardless of the exact time it
hatches, it usually occurs during warmer weather. That is one reason it hatches
so late in the day. Spinner falls can occur anywhere from late afternoon on into
the evening, depending on the weather.
These are clinger nymphs so they can survive in fast water. When they get
ready to hatch they usually move a few feet to slower moving pockets or water
along the slower edges of current seams. For those of you that are from or fish
the Eastern United States, you can better relate to this mayfly by thinking of it as
a Quill Gordon or the Gray-winged Yellow Quill which are in the same genus.
We have found these mayflies in the Madison River, canyon part of the Firehole
River, Gibbon River, Yellowstone River, Falls River and other streams in the
park in fairly plentiful quantities. We will cover fishing nymphs of this species
Copyright 2009 James Marsh