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.

Two major forks of this grayling stream come together in this pretty pool.

From the Chena River in Alaska

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

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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.

Defensive posture

Pteronarcys dorsata (Salmonfly) Stonefly Nymph

3 Pictures

Dorsal view of a Pteronarcys dorsata (Pteronarcyidae) (Salmonfly) Stonefly Nymph from unknown in Wisconsin

Pteronarcys nymphs live for two years before maturing. This small one is in its first year.

Collected March 9, 2004 from unknown in Wisconsin

Added by Troutnut on January 19, 2006

Collected March 9, 2004 from unknown in Wisconsin and added by Troutnut on January 19, 2006

Shawnny3
Moderator
Pleasant Gap, PA

Posts: 1197

Shawnny3 on Jun 29, 2008June 29th, 2008, 12:33 pm EDT

Is Pteronarcys the one that curls into a fetal position when disturbed? I don't see any pictures like that in this section, but I'm pretty sure a stone I saw do that today was one of these.

-Shawn

Jewelry-Quality Artistic Salmon Flies, by Shawn Davis
www.davisflydesigns.com

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Jun 29, 2008June 29th, 2008, 1:58 pm EDT

Hi Shawn,

Yes. A few other stoneflies will do that as well, but it is so characteristic of Pteronarcys that they are sometimes called "curlers."