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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.

Trout Stream Insects

Trout Stream Insects

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.

Fun closeup at 5X zoom of the mites parasitizing this Sweltsa stonefly.

Artistic view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Swauk Creek in Washington
Case view of a Chyranda (Limnephilidae) (Pale Western Stream Sedge) Caddisfly Larva from the Icicle River in Washington
Lateral view of a Male Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Dun from Mystery Creek #295 in Washington
Lateral view of a Empididae True Fly Adult from the South Fork Snoqualmie River in Washington
Dorsal view of a Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Artistic view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Artistic view of a Male Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Cedar River in Washington
Lateral view of a Male Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Adult from the Cedar River in Washington
Lateral view of a Male Caudatella heterocaudata (Ephemerellidae) Mayfly Dun from the Cedar River in Washington
Lateral view of a Male Cinygmula tarda (Heptageniidae) Mayfly Dun from the Cedar River in Washington
Lateral view of a Male Eurylophella temporalis (Ephemerellidae) (Chocolate Dun) Mayfly Spinner from the West Fork of the Chippewa River in Wisconsin
Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Lateral view of a Female Chauliodes rastricornis (Corydalidae) (Fishfly) Hellgrammite Adult from Devil's Creek in Wisconsin
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