Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Stream photos

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Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington

I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.

15 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.

Stonefly Species Agnetina flavescens (Golden Stones)

Where & when

In 6 records from GBIF, adults of this species have been collected during June (67%) and July (33%).

Species Range

source

Map of specific collection sites

Identification

To determine whether a specimen of Agnetina belongs to Agnetina flavescens, use the Key to Species of Agnetina Nymphs or Key to Species of Agnetina Adults.

Specimens of the Stonefly Species Agnetina flavescens

1 Nymph

Agnetina flavescens (Golden Stone) Stonefly Nymph

3 Pictures

Dorsal view of a Agnetina flavescens (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York

I took a few closeup pictures of this stonely with my old camera and a microscope.

Collected November 14, 2004 from Fall Creek in New York

Added by Troutnut on April 12, 2006

Collected November 14, 2004 from Fall Creek in New York and added by Troutnut on April 12, 2006

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