Header image
Enter a name
Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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.

Stonefly Genus Acroneuria (Golden Stones)

This abundant genus has three important East/Midwest species. The superabundant species in the West have been moved to the new genera Calineuria and Hesperoperla.

Where & when

In 163 records from GBIF, adults of this genus have mostly been collected during June (45%), July (23%), and May (21%).

In 50 records from GBIF, this genus has been collected at elevations ranging from 20 to 10663 ft, with an average (median) of 1721 ft.

Genus Range


To determine whether a specimen of Perlidae belongs to Acroneuria, use the Key to Genera of Perlidae Nymphs.

Specimens of the Stonefly Genus Acroneuria

1 Female Adult
6 Nymphs

Start a Discussion of Acroneuria


Stonefly Genus Acroneuria (Golden Stones)

10 species (Acroneuria arida, Acroneuria evoluta, Acroneuria filicis, Acroneuria flinti, Acroneuria frisoni, Acroneuria hitchcocki, Acroneuria internata, Acroneuria ozarkensis, Acroneuria perplexa, and Acroneuria petersi) aren't included.
Genus Range
Troutnut.com is copyright © 2004-2023 (email Jason). privacy policy