Hatches Made Easy:

Sulphur (Ephemerella dorothea)

03/29/08

As I stated in the previous article, the Sulphur, or Ephemerella dorothea, is one
of the mayflies that are commonly called "Sulfers" as well as a "Pale Evening
Duns". This is another good reason for using the scientific names or
alphanumeric identifiers rather than common names. The
dorothea is quite
similar to the
invaria species but there are important differences in color, hatch
times, habitat and methods of imitating them.
The body of the Sulphur is more of a true sulphur color than the Eastern Pale
Evening Dun. It's body is a tannish, 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 late in the afternoon from about 4:00 to 7:00 P. M.
They hatch approximately two weeks later than the Eastern Pale Evening Duns.
The Sulphurs exist in a few areas of some of the Smoky streams but all in all,
they few and far apart. You will only find them in isolated locations. So, why am I
including them in the hatches of the Great Smoky Mountains National Park?
Because,
when you do find them, they can be very significant. They can
be found in large quantities in the relatively few isolated locations they live in.
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 the heads, sides and tails of larger
pools. Large pockets located within fast water areas may hold Sulphurs. You will
not find any in the typical fast, pocket water of the Smoky streams. When you do
find them, you should be prepared to imitate them.

Coming Up Next:
Sulphur (Ephemerela dorothea) - Nymphs and Emergers

Copyright 2008 James Marsh