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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 Attenella delantala (Little Blue-Winged Olive) Mayfly Nymph Pictures

Ruler view of a Female Attenella delantala (Ephemerellidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.
Dorsal view of a Female Attenella delantala (Ephemerellidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Female Attenella delantala (Ephemerellidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Lateral view of a Female Attenella delantala (Ephemerellidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Ventral view of a Female Attenella delantala (Ephemerellidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington

This mayfly was collected from Mystery Creek #249 in Washington on July 25th, 2019 and added to Troutnut.com by Troutnut on July 26th, 2019.


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Female Attenella delantala (Little Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: July 25th, 2019
Added to site: July 26th, 2019
Author: Troutnut
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