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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.

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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.

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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.

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Updates from November 11, 2011

Updates from November 11, 2011

Closeup insects by Entoman from the Fall River in California

Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph

Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Fall River in California

This mature nymph is associated with the dun from the same location and date posted on this hatch page. Size 10mm.

Collected November 11, 2011 from the Fall River in California

Added by Entoman on December 15, 2011

Collected November 11, 2011 from the Fall River in California and added by Entoman on December 15, 2011

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