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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.

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.
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 Ephemerella subvaria (Hendrickson) Mayfly Dun Pictures

I collected this male Hendrickson dun and a female in the pool on the Beaverkill where the popular Hendrickson pattern was first created. He is descended from mayfly royalty.

Lateral view of a Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Artistic view of a Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Ventral view of a Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York
Ruler view of a Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the Beaverkill River in New York The smallest ruler marks are 1 mm.

This mayfly was collected from the Beaverkill River in New York on April 19th, 2006 and added to Troutnut.com by Troutnut on April 22nd, 2006.

Discussions of this Dun

My First Hendrickson Hatch
1 replies
Posted by MarkP on May 19, 2012
Last reply on May 22, 2012 by Entoman
Got to experience my first hatch of these flies on a stream where they aren't listed as having them present. Didn't last too long. Took place at 9:30 am and lasted about 30 minutes. Fish didn't rise to them during the hatch but I couldn't keep them off of a #18 BWO later in the day.
Unit of Measure
Posted by Flybyknight on Jan 11, 2008
Last reply on Jan 11, 2008 by Flybyknight
Look at the ruler. There are 10 clicks to a number.
I believe that we are looking at millimeters, not inches,
IMHO.

Dick
Hendrickson size
2 replies
Posted by Jpsully on Jan 10, 2007
Last reply on Mar 16, 2007 by Matokuwapi
Jason:

Looking at the fifth photo from the top (the one with the ruler under the fly), it would appear that if you were to rotate the fly just a bit to the left, it would show that the fly is over one inch (25mm) long. That would make it twice as long as any Hendrickson I have ever seen. The average Hendrickson (to the best of my knowledge) is usually around 10-12mm (or about 1/2 inch), hook size 10-12. The hook size just doesn't seem to fit either. Where am I going wrong when looking at this fly (and hook)?

JP

Start a Discussion of Dun

Male Ephemerella subvaria (Hendrickson) Mayfly Dun Pictures

Collection details
Location: Beaverkill River, New York
Date: April 19th, 2006
Added to site: April 22nd, 2006
Author: Troutnut
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