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.

We were lucky to be able to fish through this storm as it skirted around us to the north, giving us just enough clouds to prompt a BWO hatch but keeping the lighting at a safe distance.

From Slough Creek in Wyoming

Stream photos

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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.

6 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.

Mayfly Species Epeorus frisoni

This is a very uncommon species. The identification of all the specimens I've placed in this section is actually very uncertain, as they have proven incredibly difficult to identify. A professional entomologist collected more specimens from this stream, raised some nymphs, and did some genetic tests, and it's still uncertain. This reflects the ambiguity in the definitions and descriptions of many mayfly species.

Where & when

Preferred waters: Cold

Altitude: High

In 1 records from GBIF, adults of this species have been collected during August (100%).

Species Range

source

Map of specific collection sites

Specimens of the Mayfly Species Epeorus frisoni

2 Male Duns

Male Epeorus frisoni Mayfly Dun

9 Pictures

Lateral view of a Male Epeorus frisoni (Heptageniidae) Mayfly Dun from Mystery Creek #23 in New York

I collected this male dun together with a female spinner, a female dun, and another male dun.

Collected September 5, 2006 from Mystery Creek #23 in New York

Added by Troutnut on October 3, 2006

Collected September 5, 2006 from Mystery Creek #23 in New York and added by Troutnut on October 3, 2006

Male Epeorus frisoni Mayfly Dun

2 Pictures

I collected this male dun together with a female spinner, a female dun, and another male dun. I photographed this bedraggled one, larger than the other male, to show some of the greatest size variation within the species.

Collected September 5, 2006 from Mystery Creek #23 in New York

Added by Troutnut on October 3, 2006

Collected September 5, 2006 from Mystery Creek #23 in New York and added by Troutnut on October 3, 2006