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

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.

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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.

Updates from February 26, 0209

Updates from November 29, 1999

Photos by Bnewell and Troutnut

Photo by Les Korcala

From the Bitterroot River in Montana

Underwater photos by Bnewell

On-stream insect photos by Troutnut

Lake Owen in Wisconsin

Closeup insects by Bnewell from the Big Thompson River and the Grande Rhonde River in Montana and Washington

Rhithrogena virilis (Heptageniidae) Mayfly Nymph from the Big Thompson River in Montana
A photo showing the minor details on the nymph of this rarely collected mayfly
Female Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Adult from the Grande Rhonde River in Washington
Fly fishermen refer to this stonefly as one of "golden stones".
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