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.

Cedar sweepers line the fertile spring creek headwaters of a famous trout stream.

From the Bois Brule River in Wisconsin

Stream photos

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Epeorus albertae (Pink Lady) Mayfly Nymph Epeorus albertae (Pink Lady) Mayfly Nymph

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.

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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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Yearly Hatches

Gary
Wethersfield Ct.

Posts: 2

Gary on May 16, 2008May 16th, 2008, 1:53 pm EDT

Hi everyone I am from Connecticut and I fish the Farmington River most of my time. It seems to me that some years the hendickson hatch is heavier than others. What would be the greatest determining factors regarding next years hatch of any mayfly? Some dicussion wants to blame it on high water during a current years hatch but I feel it has to be more complex than that like what if we got a cold frost one night before the spinners have a chance to mate and drop? All answers will be appreciated.

The sound of a trout stream is music to my ears. www.ctflyfish.org

Vermonter
Posts: 15

Vermonter on May 16, 2008May 16th, 2008, 3:33 pm EDT

Good luck!
Of course the other question is will the hatch be late or early?
Good luck with that one too.