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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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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Female Callibaetis ferrugineus (Speckled Dun) Mayfly Spinner Pictures

These adults are probably C. ferrugineus.

Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Flathead River-lower in Montana
Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Flathead River-lower in Montana
Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Flathead River-lower in Montana

This mayfly was collected from the Flathead River-lower in Montana on August 13th, 2009 and added to Troutnut.com by Bnewell on June 27th, 2011.


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Female Callibaetis ferrugineus (Speckled Dun) Mayfly Spinner Pictures

Collection details
Location: Flathead River-lower, Montana
Date: August 13th, 2009
Added to site: June 27th, 2011
Author: Bnewell
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