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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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Female Stenonema vicarium (March Brown) Mayfly Dun Pictures

Here's a classic March Brown dun from the Catskills.

Lateral view of a Female Stenonema vicarium (Heptageniidae) (March Brown) Mayfly Dun from the Neversink River in New York
Female Stenonema vicarium (Heptageniidae) (March Brown) Mayfly Dun from the Neversink River in New York
Dorsal view of a Female Stenonema vicarium (Heptageniidae) (March Brown) Mayfly Dun from the Neversink River in New York
Female Stenonema vicarium (Heptageniidae) (March Brown) Mayfly Dun from the Neversink River in New York
Female Stenonema vicarium (Heptageniidae) (March Brown) Mayfly Dun from the Neversink River in New York
Ventral view of a Female Stenonema vicarium (Heptageniidae) (March Brown) Mayfly Dun from the Neversink River in New York

This mayfly was collected from the Neversink River in New York on May 20th, 2007 and added to Troutnut.com by Troutnut on May 21st, 2007.


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Female Stenonema vicarium (March Brown) Mayfly Dun Pictures

Collection details
Location: Neversink River, New York
Date: May 20th, 2007
Added to site: May 21st, 2007
Author: Troutnut
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