Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

I like this one. Glacial river, taiga, tundra, and the perpetual ice cover of a massive high ridge dozens of miles away in the Wrangell Mountains.

From the Copper River in Alaska

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

8 Recently Added Photos

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.

Salmonfly nymph anatomy

Pteronarcys dorsata (Salmonfly) Stonefly Nymph

8 Pictures

Dorsal view of a Pteronarcys dorsata (Pteronarcyidae) (Salmonfly) Stonefly Nymph from the Namekagon River in Wisconsin

Collected February 6, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected February 6, 2004 from the Namekagon River in Wisconsin and added by Troutnut on January 25, 2006

Adirman

Monticello, NY

Posts: 479

Adirman on Sep 10, 2010September 10th, 2010, 11:06 pm EDT

Hey, what'sm with those wierd fuzzy looking things under its belly and forearms? Is that some sort of traction thing for sticking to stuff?

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 11, 2010September 11th, 2010, 3:55 am EDT

Adirman-

Interesting guess, but those are called gills, and are used to "breathe" dissolved oxygen from the water. Stonefly family generally determines whether or not gills are possessed, where they are located on the body, and the form they take, finger-like or filamentous, simple or branched, etc.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Adirman

Monticello, NY

Posts: 479

Adirman on Sep 11, 2010September 11th, 2010, 5:56 am EDT

Taxon;

Thanks for the info!!