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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 Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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 5 pictures. The message is below.
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on May 6, 2017May 6th, 2017, 2:39 pm EDT
I've submitted pictures of these before but Kogotus/Rickera wasn't as far along in it's instars and there weren't any live pictures of Isoperla mormona.

Kogotus/Rickeri can be found here:
http://www.troutnut.com/topic/9110/Kogotus-Rickera

Isoperla mormona can be found here:
http://www.troutnut.com/topic/8606/Isoperla-nymphs

The first three pictures are of Kogotus/Rickeri and the last two are of Isoperla mormona.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Crepuscular
Crepuscular's profile picture
Boiling Springs, PA

Posts: 920
Crepuscular on May 9, 2017May 9th, 2017, 3:06 am EDT
Nice. Thanks for posting!
Jmd123
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on May 9, 2017May 9th, 2017, 12:57 pm EDT
Wonderful pictures as always, Mark. Beautiful creatures up-close too! Thanks for sharing.

Jonathon
No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Oldredbarn
Oldredbarn's profile picture
Novi, MI

Posts: 2600
Oldredbarn on May 11, 2017May 11th, 2017, 4:16 am EDT
Mark

Talk to me about the second from last pic...The littler one in the group. Different hatch years? Is this stone on a two year hatch cycle?

I have found Hex nymphs in our Manistee that are like that. One a larger size and another half as big. I assumed that one was slated to hatch the following year (I found them after Labor Day), and the smaller one the years after?

Spence
"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
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on May 11, 2017May 11th, 2017, 12:12 pm EDT
Eric and Jonathan - Thanks for the kind words.

Spence - The latest word I've found has been that no one knows for sure but for Isoperla nymphs it's generally assumed that it's one year. I would guess that the smaller one will transform this year. It may also be a male, they tend to be smaller than the females.

As for the Kogotus/Rickeri no one has checked out it's time for remaining a nymph or at least I'm unable to find anything.

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

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