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.

This view of the pipeline, the Atigun River, and an impressive sunset/rise was one of my first views of the North Slope as I came through Atigun Pass in the middle of the night.

From the Atigun River in Alaska

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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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Light Cahills?

Adirman

Monticello, NY

Posts: 479

Adirman on Jun 14, 2016June 14th, 2016, 5:00 am EDT

Hey Guys, I was fishing last evening on the Willow and noticed the usual stuff that been around lately, a mix of caddis, Slate Drake, Sulfurs, etc. but then i started seeing a few quite large Mayflys float past me. I picked one up to get a good look, it was around a size 10, VERY white, wings looked pretty white too, sorry I dont have a pic, maybe I can get one in a day or 2, any thoughts based on time of year and limited description I provided? Im thinking its a Light Cahill of the Species Macaffertium Ithaca

Thanks,

Adirman

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jun 14, 2016June 14th, 2016, 6:24 am EDT

Adirman,

Could be Maccaffertium ithaca, also could be Maccaffertium terminatum or Epheron leukon. Also probably others I missed.

Here are some links:

Maccaffertium terminatum - http://www.troutnut.com/hatch/600/Mayfly-Maccaffertium-terminatum

Epheron leukon - http://bugguide.net/node/view/316968/bgimage

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

Adirman

Monticello, NY

Posts: 479

Adirman on Jun 16, 2016June 16th, 2016, 7:37 pm EDT

Not Ephoron leukon, too different, either Terminatum or Ithaca I think, was definitely a good sized Mayfly, i thought a 10 when I observed it

PagansMind