|....................... .................... ...Fly Fishing Yellowstone National Park
New KISS Bug Series - Part 51
Although the female Golden Stoneflies cannot often be found depositing their eggs during the middle of the
day in most of the Eastern trout streams, it is quite common in Western and Pacific Coastal trout streams. It
is more common than not in the streams in and around Yellowstone National Park. This is important
because the adult female Golden Stoneflies offer the only opportunity to catch trout that are feeding on the
adults. The males don't get in the water at all unless they accidentally fall or get blown in the water by
strong winds. They hatch out of the water and they mate and die out of the water.
You will commonly find Golden Stonefly females dipping down to the surface of the water depositing their
eggs. Anytime you detect this activity occurring, you should fish an imitation of them. Our Perfect Fly
imitation of the adult Golden Stonefly is made of foam and floats high in the water. It looks very realistic.
Trout will definitely eat the egg laying females and when they do, they will eat the Perfect fly imitation of
Although we have seen the egg laying taking place during the middle of the day, most likely you would
encounter this activity more intense late in the afternoons. It can occur throughout much of the day on
some western trout stream. This seems to be quite common in the streams of the park. If clouds have
covered the sun for some time, they usually begin earlier in the day.
The key to the presentation is to watch the water for stoneflies that are depositing their eggs. That's exactly
where you want to place your imitation of the adult Golden Stonefly. These stoneflies are large enough that
they are easy to spot.
You want to cast to them the easiest way you can get the fly there. There's nothing special about the
presentation you need to make. As long as the trout feeding on the egg layers don't see you, any way you
can get the fly in the right areas of the stream will work, even if the fly lands with a rather splashy
presentation. Keep in min d that I wrote fly, not fly line.
The female adult Golden Stoneflies deposit their eggs in the same water they hatch from. This is faster
water, usually riffles and runs but can be fast moving smooth surface water. They are not found in slow
Availability to trout:
Type of water:
Duration of hatch period:
Perlidae family species
Throughout the park in most all streams
Moderate to Fast
2 weeks to a month