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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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This topic is about the True Fly Family Simuliidae

Black flies are not usually regarded as important trout fare, but scientific studies of some rivers have shown them to make up the majority of the trout's diet. Such places are few and far between, but anglers should be aware of the possibility and keep a lookout for high concentrations of the larvae.

The adults are nasty, annoying, biting flies.

Example specimens

Jpsully
bedminster, nj

Posts: 4
Jpsully on Sep 15, 2006September 15th, 2006, 1:13 pm EDT
Jason:

Very nice site, indeed!

Just wanted to acknowledge your assistance and say thanks for your help in identifying a bug I happened to seine out of the Upper Delaware this week - on a drizzly afternoon, there were tiny BWO's coming off in small numbers; but also present (in greater numbers) was a size 24/26 down-winged light-olive insect, with black mottling, that I had not seen before. They rode the current for quite a while, and the trout were quietly sipping them. After describing the fly (as best I could), you were able to provide photos, along with the suggestion that these were "blackflies" (Simulidae). I had no idea that these flies were present in the Delaware system, but will certainly carry a few imitations from now on (just in case).

JP

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