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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 Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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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Jmd123
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Sep 21, 2012September 21st, 2012, 2:27 pm EDT
Hey man, we still have nine more days in our regular trout season here in Michigan! Got three nice brookies last night including an 11-incher...and you're showing us SNOW??? (OK, the water was pretty cold...) We've also got our very first fall colors showing...salmon begining to run...ain't you got any of those??

I know, Jason, it's just an algorythem (sp?)...but you can YANK those snow pics from the loop until at least November, can't you???

;oD

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Sep 21, 2012September 21st, 2012, 3:56 pm EDT
Sorry, can't yank any pics. ;) I should add a bunch of new ones to the rotation sometime... I have some good ones! At least you're seeing September/October snow, not February pics yet.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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