Pale Evening Dun - Emerger
The Pale Evening Duns emerge in the summer and early fall depending on the
particular location. Hatches at very high elevations can come earlier than those
at the lower elevations because the water starts cooling down earlier as a
general rule. Hatches normally occur in the afternoons if the weather is cool and
evenings if it is hot. Most of the time the weather will be cool, otherwise the water
would not be but it is possible for cold weather to reduce the water temps enough
for them to hatch and then turn back warm.
The nymphs migrate from the fast water to the slower parts of the stream just
prior to hatching. In pocket water this may be only a couple of feet or yards, so
don't take this to mean they move several hundred yards because they don't.
This usually move to shallow water near the banks of small pockets where the
water is calmer than the surrounding faster water.
They normally hatch in water between 50-55 degrees F. but remember this is not
a early summer hatch when the water warms up to that temperature. They start
to hatch when the water cools down to that temperature. In Yellowstone this can
be anywhere from mid August to October depending primarily on the altitude but
also the varying weather.
Emerger imitations can be presented on the swing from the faster water to the
shallow water near the banks. You want to allow the fly to reach the surface at
the end of the drift. An up and across presentation works best for this.
We have two types of emerger patterns for most all mayflies that hatch in the
water including this one. One is a CDC winged version on a curved hook
designed to float in the surface skim and the other is a trailing shuck emerger
imitating the nymphal shuck still stuck to the tail of the newly emerged dun. This
one is also designed to float in the surface skim. Both can be presented on the
swing in the same manner.
Copyright 2013 James Marsh
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