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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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Falsifly's profile picture
Hayward, WI.

Posts: 660
Falsifly on Dec 25, 2007December 25th, 2007, 11:58 am EST
I think some of the more scientifically inclined contributors to this site might find this an interesting tidbit. I came across it during a Google search and decided to forward it here. Up to this point I’ve never given it much thought but it does offer a plausible possibility.
But than again you guys may be way ahead of me on this one.


When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Dec 25, 2007December 25th, 2007, 1:14 pm EST

That's an interesting theory, which I hadn't heard before. My suspicion is that optimal water detection may be but one of several reasons for the increased insect flight at dusk. In any event, Merry Christmas to you, and thanks for sharing.
Best regards,
Roger Rohrbeck

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