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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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Ephemerella (Hendricksons, Sulphurs, PMDs) Mayfly Nymph Pictures

Ephemerella is a very common genus of mayfly in Montana but nymphs are difficult to identify to species.

This mayfly was collected from Rock Creek in Montana on June 12th, 2007 and added to Troutnut.com by Bnewell on June 26th, 2011.


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Ephemerella (Hendricksons, Sulphurs, PMDs) Mayfly Nymph Pictures

Collection details
Location: Rock Creek, Montana
Date: June 12th, 2007
Added to site: June 26th, 2011
Author: Bnewell
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