Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

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.

Inlet of Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

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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.

Caddisfly Species Hesperophylax designatus (Silver Striped Sedges)

Where & when

This species is abundant nationwide. It was once considered to be an East/Midwest species, but a widespread western species Hesperophylax incisus is now considered to be a synonym of designatus.

In 112 records from GBIF, adults of this species have mostly been collected during July (22%), June (21%), August (21%), May (14%), September (8%), and April (7%).

In 74 records from GBIF, this species has been collected at elevations ranging from 3 to 11926 ft, with an average (median) of 5741 ft.