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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.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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.

Mottled Willowflies

Like most common names,"Mottled Willowfly" can refer to more than one taxon. They're previewed below, along with 2 specimens. For more detail click through to the scientific names.

Stonefly Species Strophopteryx fasciata

These are pretty much always called Mottled Willowflies.
Dorsal view of a Female Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin
Several stoneflies of this species were the first adult insects I found in 2004 when I started this site. The hatch was sparse but lasted a good part of the day, and I noted a few good rises despite the early season cold. They ended up struggling on the water's surface fairly often.
Dorsal view of a Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Nymph from unknown in Wisconsin

Stonefly Genus Strophopteryx

These are sometimes called Mottled Willowflies.
Strophopteryx fasciata is the most important species of Early Brown Stoneflies.
Dorsal view of a Female Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin
Several stoneflies of this species were the first adult insects I found in 2004 when I started this site. The hatch was sparse but lasted a good part of the day, and I noted a few good rises despite the early season cold. They ended up struggling on the water's surface fairly often.
Dorsal view of a Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Nymph from unknown in Wisconsin

Mottled Willowflies

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