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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 Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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.

Wiflyfisher
Wiflyfisher's profile picture
Wisconsin

Posts: 622
Wiflyfisher on Jul 11, 2008July 11th, 2008, 7:02 am EDT
I thought others might enjoy reading this article...

http://www.lacrossetribune.com/articles/2008/07/11/news/03mayflowers11.txt
Teddyp
North Carolina

Posts: 18
Teddyp on Jul 11, 2008July 11th, 2008, 9:57 am EDT
That's awesome!
Ted
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Jul 14, 2008July 14th, 2008, 8:46 am EDT
Cool, John. For those who haven't seen Doppler tracking of Hex swarms before, here's a link to the PSU Behrend site that has several neat little movies and an explanation of how the Doppler tracking is done:

http://paaquaticfliesrus.bd.psu.edu/webroot/mayflies.asp
Wiflyfisher
Wiflyfisher's profile picture
Wisconsin

Posts: 622
Wiflyfisher on Jul 14, 2008July 14th, 2008, 1:46 pm EDT
Gonzo, Interesting! I would guess the size of the insects hatching and the density of the hatch has to be pretty amazing to show up. In my experience I have only heard of it on radar for the Hex. hatch, no other mayflies.

The E. luekon/album hatch I have seen on a couple occasions extremely dense as well and covered some bridges, but I have not heard of it on droppler radar.

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