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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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Male Siphlonurus occidentalis (Gray Drake) Mayfly Spinner Pictures

This mayfly was collected from Crazy Beaver Spring in Montana on July 31st, 2007 and added to Troutnut.com by Bnewell on June 28th, 2011.


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Male Siphlonurus occidentalis (Gray Drake) Mayfly Spinner Pictures

Collection details
Location: Crazy Beaver Spring, Montana
Date: July 31st, 2007
Added to site: June 28th, 2011
Author: Bnewell
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