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.

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Skwala (Large Springfly) Stonefly Nymph Skwala (Large Springfly) Stonefly Nymph

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington

This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.

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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.

Male spinner. Isonychia ?

Wystone has attached this picture. The message is below.

Wystone
Posts: 1

Wystone on Aug 12, 2007August 12th, 2007, 3:57 am EDT

Identication help? Center Maine region ( NW of Bangor). Picture taken early July.
Screen openings 2mm

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Aug 12, 2007August 12th, 2007, 4:11 am EDT

I'll leave the ID to the professionals, but great photo and measurement idea.

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Aug 12, 2007August 12th, 2007, 8:06 am EDT

Male spinner. Isonychia ?

Yes, it would appear to be. There are (at least) three Isonychia species recorded from Maine, I. bicolor, I. georgiae, and I. obscura. Although the greatest statistical likelihood would be I. bicolor, reliable identification to species requires microscopic examination of male imago genitalia.

Luckily, we have a mayfly entomologist actively participating on this forum, who is qualified to make such an identification, if sent a preserved specimen. See this thread.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

JAD

Alexandria Pa

Posts: 362

JAD on Aug 12, 2007August 12th, 2007, 1:49 pm EDT

If I could taste it, I could tell you :) nice picture.

JaD

They fasten red (crimson red) wool around a hook, and fix onto the wool two feathers which grow under a cock’s wattles, and which in colour are like wax.
Radcliffe's Fishing from the Earliest Times,