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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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Martinlf has attached these 2 pictures to this report. The message is below.
Glen Canyon Dam
Just below the dam.

Report at a Glance

General RegionArizona
Dates Fisheda while back
Fish Caughtrainbows
Conditions & Hatchesmidges

Details and Discussion

Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Sep 20, 2016September 20th, 2016, 5:35 pm EDT
I'm putting up another photo or two for Spence. The water was crystal clear at the dam and for miles below when we were there.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Sep 22, 2016September 22nd, 2016, 4:01 pm EDT
Spence, Spence, where the heck are you?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Jmd123
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Sep 22, 2016September 22nd, 2016, 6:16 pm EDT
Louis, perhaps he is on an end-of-season fishing frenzy before 90% of our trout waters close for 7 months. At least, that's what I'm doing...though October is looking pretty nice and we've got some year-round trout waters around here. It'll have to be snow and ice before I put the fly rods away...

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Dec 26, 2016December 26th, 2016, 1:45 am EST
One more for Ed.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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