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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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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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.

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.

Gumaga sp.

Millcreek has attached these 6 pictures to aid in identification. The message is below.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Feb 16, 2015February 16th, 2015, 6:22 am EST

This larvae is common to Mill Creek, a tributary of the Russian River. Haven't found it in the river yet, but it's seasonally common in the stream. Keyed it out to genus in Merritt, Cummins and Berg (2008). Curious as to species. Any help would be appreciated.

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

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Feb 16, 2015February 16th, 2015, 1:59 pm EST

Pretty thing.

Gutcutter

Pennsylvania

Posts: 470

Gutcutter on Feb 17, 2015February 17th, 2015, 3:26 am EST

Does anybody know how they make that type of case?
Very cool.
Some amazing engineering.

All men who fish may in turn be divided into two parts: those who fish for trout and those who don't. Trout fishermen are a race apart: they are a dedicated crew- indolent, improvident, and quietly mad.

-Robert Traver, Trout Madness

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Feb 17, 2015February 17th, 2015, 6:14 am EST

Hi Tony-

Does anybody know how they make that type of case?

Caddisfly larvae use a mouthpart gland which extrudes silk as a binding agent to build their cases.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Creno
Grants Pass, OR

Posts: 302

Creno on Feb 17, 2015February 17th, 2015, 7:43 am EST

Gumaga is a great taxa to initiate a discussion of the species concept. There are numerous publications from the Resh Lab involving Gumaga "species". (http://nature.berkeley.edu/reshlab/) Ya probably should start with Jackson and Resh 1998. (Jackson, John K., Resh, Vincent H. 1998. Morphologically cryptic species confound ecological studies of the caddisfly genus Gumaga (Trichoptera: Sericostomatidae) in northern California. Aquatic Insects 20: 69-84.)