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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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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Litobrancha
Knoxville TN

Posts: 51
Litobrancha on Jun 4, 2007June 4th, 2007, 11:47 am EDT
pretty sure this psilotreta, possibly labida. frontalis has big puffy head warts that pop out and hairy maxillary palps. some of the other species are lighter colored.
Troutnut
Troutnut's profile picture
Administrator
Bellevue, WA

Posts: 2758
Troutnut on Jun 4, 2007June 4th, 2007, 12:14 pm EDT
Thanks. :) That would fit pretty well.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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