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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 Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on Feb 23, 2013February 23rd, 2013, 12:58 pm EST
Drunella drifting with current:
http://www.youtube.com/watch?v=3h9elSPDRQs
Shows nymphs pretty much out of control, probably resting between swimming bouts. A follow up to previous discussions about fly drift posture.
Crepuscular
Crepuscular's profile picture
Boiling Springs, PA

Posts: 920
Crepuscular on Feb 23, 2013February 23rd, 2013, 1:45 pm EST
Cool video. Thanks for posting the link.

Eric
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Feb 23, 2013February 23rd, 2013, 2:37 pm EST
Excellent, Paul. Sure confirms why some designs that can't help but drift upside down still work so well and that getting too anal about nymph orientation when fished dead drift is probably unnecessary. Also dispels the myth that nymphs are either drifting along the bottom or at the surface. This isn't specific, either. I've noticed the same behavior with other mayflies, stones, and caddis as well. Ever notice the odd baetid every now and then attached to the meniscus upside down when they hatch? My guess is that's the source of a lot of cripples. Great stuff, thanks!
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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