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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.

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

I'm not sure of the species of this female spinner, and unfortunately I never found the associated males or duns to aid in identification. The egg-laying flight and fall of fairly large clouds of these females caused good rises of choosy trout for a week or so around early July on a large, cold spring creek in the northwoods. There is a distinctive stripe down the female's back, identical to that on this specimen collected a month later.

Lateral view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the Bois Brule River in Wisconsin
Artistic view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the Bois Brule River in Wisconsin
Dorsal view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the Bois Brule River in Wisconsin
Ruler view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the Bois Brule River in Wisconsin The smallest ruler marks are 1/16".
Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the Bois Brule River in Wisconsin
Ventral view of a Female Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the Bois Brule River in Wisconsin

This mayfly was collected from the Bois Brule River in Wisconsin on July 1st, 2005 and added to Troutnut.com by Troutnut on April 22nd, 2006.


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Female Eurylophella (Chocolate Dun) Mayfly Spinner Pictures

Collection details
Location: Bois Brule River, Wisconsin
Date: July 1st, 2005
Added to site: April 22nd, 2006
Author: Troutnut
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