Pale Morning Dun (PMD):
The Pale Morning Dun is considered by many anglers to be the most important mayfly
in the West. It certainly rivals the Blue-winged Olive species for that title. This is
primarily due to the fact that they emerge over such a long period of time and provide
fairly predictable hatches. These are species of the Ephemerella genus, often just
called PMDs.
The infrequens species may start emerging as soon as the water temperature gets into
the low fifty degrees Fahrenheit level. This species can hatch for as long as a couple
of months on the same river.
The inermis species start emerging later on in the year, after the infrequens, depending
on the stream, and can last as long as two months on the same stream. There are a
couple of other species that are not that prevalent. These two important species, the
inermis and the infrequens, are so similar that they cannot be distinguished without the
aid of a microscope.
They prefer streams with rooted vegetation but any of the streams with a stable flow of
water usually have consistent PMD hatches. This is certainly a mayfly that you need to
become familiar with and have imitations of if you plan on fishing Yellowstone.
The Pale Morning Dun is considered by many anglers to be the most important mayfly
in the West. It certainly rivals the Blue-winged Olive species for that title. This is
primarily due to the fact that they emerge over such a long period of time and provide
fairly predictable hatches. These are species of the Ephemerella genus, often just
called PMDs.
The infrequens species may start emerging as soon as the water temperature gets into
the low fifty degrees Fahrenheit level. This species can hatch for as long as a couple
of months on the same river.
The inermis species start emerging later on in the year, after the infrequens, depending
on the stream, and can last as long as two months on the same stream. There are a
couple of other species that are not that prevalent. These two important species, the
inermis and the infrequens, are so similar that they cannot be distinguished without the
aid of a microscope.
They prefer streams with rooted vegetation but any of the streams with a stable flow of
water usually have consistent PMD hatches. This is certainly a mayfly that you need to
become familiar with and have imitations of if you plan on fishing Yellowstone.
Copyright 2008 James Marsh
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