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.

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

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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.

Male Tricorythodes (Trico) Mayfly Spinner Pictures

Ventral view of a Male Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho

Lateral view of a Male Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho

Every ruler mark is 1/16 inch.

Ruler view of a Male Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1/16".

This mayfly was collected from the Henry's Fork of the Snake River in Idaho on August 11th, 2018 and added to Troutnut.com by Troutnut on June 12th, 2019.

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