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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 Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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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Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Feb 11, 2013February 11th, 2013, 6:23 am EST
Decided to go solo.
Catskill fly fisher for fifty-five years.
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Feb 11, 2013February 11th, 2013, 9:14 am EST
Decided to go solo.
Catskill fly fisher for fifty-five years.
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Feb 11, 2013February 11th, 2013, 12:44 pm EST
Thanks, Matt. I somehow had missed the date in your original post, so I've deleted my silly question. Hope you get some takers--this sounds like a fantastic trip. Al Caucci runs a 7 day trip on the Missouri for $3,700.00, so your trip is a bargain for sure.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Gutcutter
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Pennsylvania

Posts: 470
Gutcutter on Feb 11, 2013February 11th, 2013, 12:45 pm EST
The river and the lodging are as Matt described. And he knows that section of the river as well as (or better than) some guides do.
The dates don't work for me, so I can't make it this year.
It is an amazing fishery.
All men who fish may in turn be divided into two parts: those who fish for trout and those who don't. Trout fishermen are a race apart: they are a dedicated crew- indolent, improvident, and quietly mad.

-Robert Traver, Trout Madness
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Feb 11, 2013February 11th, 2013, 1:33 pm EST
Post deleted.
Catskill fly fisher for fifty-five years.

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