Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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)

Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

11 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.

Female Eurylophella (Chocolate Dun) Mayfly Spinner Pictures

This Ephemerellidae spinner was emerging unusually late, and on a warm stream. Since it's a female, identification is difficult. Her identical coloration suggests she's probably of the same species as this specimen collected on a cool trout stream almost a month earlier.

Lateral view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin

Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin

Ventral view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin

Oblique lighting and false color illuminate the vein patterns in this completely transparent hind wing.

Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin

These strangely lighted and enhanced "wingprint" photos can help with the identification of some species even when the veins are clear.

Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin

Dorsal view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin

This mayfly was collected from the West Fork of the Chippewa River in Wisconsin on July 28th, 2005 and added to Troutnut.com by Troutnut on April 14th, 2006.

Start a Discussion of Spinner