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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.

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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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Baetis (Blue-Winged Olive) Mayfly Nymph Pictures

Ruler view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Cayuta Creek in New York The smallest ruler marks are 1 mm.
Ventral view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Cayuta Creek in New York
Dorsal view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Cayuta Creek in New York
Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Cayuta Creek in New York

This mayfly was collected from Cayuta Creek in New York on April 14th, 2007 and added to Troutnut.com by Troutnut on April 22nd, 2007.

Discussions of this Nymph

Baetidae
4 replies
Posted by Earlfishman on Apr 23, 2007
Last reply on Apr 24, 2007 by Konchu
This one looks like an almost ready to emerge male Baetis sp., but I can't be 100% based on the pictures and I definitely can't go any further than that.

As a side note, if anyone is interested in a good key to the larvae of Baetidae, search google for "EPA photographic Baetidae key" and click on the PDF at the EPA site (direct link to the PDF here). The key has some good photos and works very well for the eastern U.S.

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Baetis (Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Cayuta Creek, New York
Date: April 14th, 2007
Added to site: April 22nd, 2007
Author: Troutnut
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