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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 Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing 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.
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.

Millcreek has attached these 4 pictures. The message is below.
Acentrella insignificans
Ameletus sp
Capnia umpqua
Taenionema pacificum
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jan 29, 2015January 29th, 2015, 3:56 am EST
Down at the Russian River today and some of the critters are back. Actually,
most have been in the river for about two weeks. Some of the animals are Acentrella insignificans, Ameletus sp., probably a female Capnia umpqua and Taenionema pacificum.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Troutnut
Troutnut's profile picture
Administrator
Bellevue, WA

Posts: 2758
Troutnut on Jan 29, 2015January 29th, 2015, 7:54 am EST
Nice photos!
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jan 29, 2015January 29th, 2015, 8:41 am EST
Jason,

Nice photos!


Thank you.

Mark
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on Jan 29, 2015January 29th, 2015, 2:20 pm EST
Yes, nice images.

Some getting ready to pop??
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jan 29, 2015January 29th, 2015, 5:08 pm EST
Paul,

Yeah, the Acentrella and the Capnia are about to emerge.

Mark
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Feb 5, 2015February 5th, 2015, 10:48 am EST
The Ameletus is just about the most gorgeous mayfly nymph I've ever seen. Great photos!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Feb 5, 2015February 5th, 2015, 11:13 am EST
Louis,

The Ameletus is just about the most gorgeous mayfly nymph I've ever seen. Great photos!


Thanks
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

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