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.

A small, old rock wing dam has created an excellent riffle and pool in this classic trout stream.

Stream photos

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Male Baetidae (Blue-Winged Olive) Mayfly Dun Male Baetidae (Blue-Winged Olive) Mayfly Dun

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.

7 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.

Trout Stream Insects, Page 2

Visit the Trout Stream Insects section for thousands of closeups of mayflies, stoneflies, caddisflies, and others, along with detailed information about their life cycles and relevance to angling. This section showcases a few favorites.

Artistic view of a Ironoquia lyrata (Limnephilidae) (Eastern Box Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

Lateral view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

Artistic view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin

Male Nemotaulius hostilis (Limnephilidae) (Northern Caddisfly) Caddisfly Adult from the Teal River in Wisconsin

Lateral view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington

Lateral view of a Male Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from the Yakima River in Washington

Lateral view of a Female Isoperla fusca (Perlodidae) (Yellow Sally) Stonefly Adult from the Yakima River in Washington

Case view of a Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington

Artistic view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from Silver Creek in Idaho

Lateral view of a Female Ephemerella tibialis (Ephemerellidae) (Little Western Dark Hendrickson) Mayfly Dun from the East Fork Big Lost River in Idaho

Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho

Male Acerpenna pygmaea (Baetidae) (Tiny Blue-Winged Olive) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho

Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Henry's Fork of the Snake River in Idaho

Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from Mystery Creek #249 in Washington

Lateral view of a Male Drunella coloradensis (Ephemerellidae) (Small Western Green Drake) Mayfly Dun from Mystery Creek #199 in Washington

Artistic view of a Dolichopodidae True Fly Adult from Mystery Creek #199 in Washington

Dorsal view of a Male Drunella pelosa (Ephemerellidae) Mayfly Nymph from Mystery Creek #249 in Washington

Blue-winged OlivesBaetis

Trout Stream Insects, Page 2

Trout Stream Insects, Page 2

Blue-winged Olives
Baetis