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.

Stream photos

Featured on the forum

Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)

Re: Trico Tips
In the Mayfly Genus Tricorythodes by Martinlf

Re: UV spectrum and trout
In General Discussion by Martinlf

Re: closing the gender gap in flyfishing
In General Discussion by Konchu (Smallflyguy replied)

Re: Fishing Kupa River, Slovenia
In Fishing Reports by Slocum (Fish1 replied)

Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

9 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.

Updates from May 18, 2004

Closeup insects by Troutnut from Miscellaneous Wisconsin and the Bois Brule River in Wisconsin

Female Ephemerella subvaria (Hendrickson) Mayfly Spinner

3 Pictures

Female Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Spinner from unknown in Wisconsin

Collected May 18, 2004 from unknown in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 18, 2004 from unknown in Wisconsin and added by Troutnut on January 25, 2006

Female Ephemerella subvaria (Hendrickson) Mayfly Spinner

3 Pictures

Ruler view of a Female Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Spinner from the Bois Brule River in Wisconsin The smallest ruler marks are 1/16".

This one's a bit bedraggled because it was rainy and I had a hard time keeping anything dry, including the container I was putting mayflies in. I was practically juggling up there balanced on a rock trying to catch mayflies and trout at the same time.

Collected May 18, 2004 from the Bois Brule River in Wisconsin

Added by Troutnut on January 25, 2006

Collected May 18, 2004 from the Bois Brule River in Wisconsin and added by Troutnut on January 25, 2006