Header image
Enter a name
Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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.
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's profile picture

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

North Carolina

Posts: 18
Teddyp on Jul 11, 2008July 11th, 2008, 9:57 am EDT
That's awesome!
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:

Wiflyfisher's profile picture

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.

Quick Reply

Related Discussions

Last Reply
Aug 28, 2013
by Martinlf
Jan 29, 2010
by Shawnny3
Sep 2, 2010
by Martinlf
Troutnut.com is copyright © 2004-2023 (email Jason). privacy policy