Sulphur Dun

As I stated in the previous part of this article, the Sulphur, or Ephemerella
dorothea
, is one of the mayflies that are commonly called "Sulphurs" as well as a
"Pale Evening Duns". The
dorothea species (Sulphur) is quite similar to the
invaria species (Pale Evening Dun) but there are important differences in color,
hatch times, habitat and methods of imitating them. The information page links
under the various Perfect Fly imitations of this mayfly will provide the information
you need for fishing them.

This mayfly is found in the Eastern U. S. and in some Mid-western trout streams.
If your from the West, be aware that it is quite similar to the Pale Morning Dun.
The main differences in the Sulphur and the very similar Eastern Pale Evening
Dun are as follows:

The body of the Sulphur is more of a true sulphur color than the Eastern Pale
Evening Dun. It's body is a tanish, yellow color. The sulphur is also a hook size
and sometimes two hook sizes smaller than the Eastern Pale Evening Dun.

These mayflies usually hatch in the afternoon from about 3:00 to 7:00 P. M.
In most streams where both the Sulphur and Eastern Pale Evening Dun exist,
they hatch approximately two weeks later than the Eastern Pale Evening Duns.

Generally, you will find Sulphurs where the stream is falling on a low to moderate
decline. These mayflies like slower moving water than the Eastern Pale
Evening Duns they are often confused with.

Most of the time you will find them at the ends of long, slow moving runs; and at
the heads, sides and tails of larger pools. Large pockets located within fast water
areas of pocket water streams may hold Sulphurs. You will not find many, if any,
in the typical fast, pocket water streams. If they exist, the will be located in the
slower sections of water which is usually isolated sections of the streams. When
you do find them, you should be prepared to imitate them.
Copyright 2013 James Marsh
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