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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.

Simuliidae (Black Fly) True Fly Larva Pictures

I strangely enhanced the colors in this picture to highlight the silk thread from which this larva is dangling.  It attached the line to the little tweezers I used to pick it up, and when I lowered it into my little photo tank it was suspended by the line for a while.  I believe some authors have mentioned imitating this line when fishing Simuliidae imitations, but that seems kind of silly given the diameter involved, probably something like a 30X tippet.

Artistic view of a Simuliidae (Black Fly) True Fly Larva from Fall Creek in New York
Simuliidae (Black Fly) True Fly Larva from Fall Creek in New York
Lateral view of a Simuliidae (Black Fly) True Fly Larva from Fall Creek in New York
Simuliidae (Black Fly) True Fly Larva from Fall Creek in New York
Ventral view of a Simuliidae (Black Fly) True Fly Larva from Fall Creek in New York
Ruler view of a Simuliidae (Black Fly) True Fly Larva from Fall Creek in New York The smallest ruler marks are 1 mm.

This true fly was collected from Fall Creek in New York on March 30th, 2007 and added to Troutnut.com by Troutnut on April 2nd, 2007.

Discussions of this Larva

The more you know..
2 replies
Posted by Phineartz on Jan 16, 2019
Last reply on Jan 17, 2019 by Jmd123
These are always abundant in my stream samples and have even found them wriggling around on my pack after a dunking.. I have always thought they were midge larvae as that is the common assumption I've gathered from local anglers, but due to their size and shape I started to question this. Scouring online resources and comparing photos led me here, where I see they are a different critter altogether. I have never heard of anglers discussing the use of Simuliidae patterns but I'm looking forward to experimenting with them in the future. Thank you for the photos and the resource! -Mike in KY

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Simuliidae (Black Fly) True Fly Larva Pictures

Collection details
Location: Fall Creek, New York
Date: March 30th, 2007
Added to site: April 2nd, 2007
Author: Troutnut
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