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.

Lone tree on a rock in the middle of Big Lake. Fittingly, Big Lake is the largest of several short wide spots in the upper Brule River.

From the Bois Brule River in Wisconsin

Stream photos

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Female Hydropsyche (Spotted Sedge) Caddisfly Adult Female Hydropsyche (Spotted Sedge) Caddisfly Adult

Lateral view of a Female Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Columbia 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.

Green Weevils

This common name refers to only one genus. Click its scientific name to learn more.

Beetle Genus Polydrusus

These are often called Green Weevils.

Polydrusus (Weevil) Beetle Adult

3 Pictures

Artistic view of a Polydrusus (Curculionidae) (Weevil) Beetle Adult from the Bois Brule River in Wisconsin

This is an iridescent green terrestrial beetle. They're common in northern Wisconsin's forests during the middle of summer, and I found them on the water's surface more than any other terrestrial insect. I saw the trout take a few and caught some trout on an imitation.

Collected July 30, 2004 from the Bois Brule River in Wisconsin

Added by Troutnut on January 25, 2006

Collected July 30, 2004 from the Bois Brule River in Wisconsin and added by Troutnut on January 25, 2006

Green Weevils

Scientific Name

Polydrusus

Blue-winged OlivesBaetis

Green Weevils

Beetle Genus Polydrusus

Green Weevils

Scientific Name

Blue-winged Olives
Baetis