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.

Neversink Gorge (Wolf Brook) in New York

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.

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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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Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph Pictures

Close examination of this specimen under a microscope reveals that it has small rounded tubercles on the tergites and the tails are uniformly covered with short black hairs. Looking at this specimen a while later, my early observations were probably not relevant because it was such as small early instar mayfly that its identifying characteristics were not fully developed.

This mayfly was collected from unknown in Wisconsin on January 31st, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.

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