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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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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Lateral view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the Namekagon River in Wisconsin
This specimen was collected on the same trip as a similar dun.
Oldredbarn's profile picture
Novi, MI

Posts: 2600
Oldredbarn on Apr 6, 2010April 6th, 2010, 6:27 am EDT
Jason, Taxon, Gonzo et al...

This one seems to have slipped through the id gauntlet...Does anyone want to hazzard a guess on the species level? BWO is a bit broad...

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Apr 6, 2010April 6th, 2010, 1:08 pm EDT
Going to genus level for the Baetidae can be really tricky, and species level is even harder. The scientific keys don't provide any way to identify the female duns. It may be that someone very familiar with the family can recognize it by sight, but if I were to try I would have to fall back on the standard angler's method of identifying Baetids: pull a name out of a hat. "Let's see here... it's (rummage rummage rummage)... it's Baetis vagans" (That's no longer a valid species, but it is the name that seems to get pulled out of the hat most often.)
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Apr 6, 2010April 6th, 2010, 1:42 pm EDT
Jason, now you're being intentionally vague, aren't you?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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