The Slate Dun is the Epeorus longimanus, a western species
of the Heptageniidae family. It's also called the Slate Brown
Dun. This mayfly prefers the fast moving water of mountain
streams. The mayfly emerges anytime from June to early
October depending on the location. Spinners can fall from late
afternoon to dark. In some cases they fall in the early evenings.
The hatches are generally not huge but they usually hatch
when there are few other hatches occurring. That can make
them very important.
Nymph
Spinner
Emerging Adult
Dun
Mayflies: Slate Dun
Slate Dun (Imitations)
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Copyright 2013 James Marsh
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