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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 Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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 Dun Pictures

This is one of four specimens I photographed together from the same hatch, also including a nymph, a male dun, and a male spinner.

Ruler view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from Mystery Creek #304 in Idaho The smallest ruler marks are 1 mm.
Dorsal view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from Mystery Creek #304 in Idaho
Ventral view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from Mystery Creek #304 in Idaho

This mayfly was collected from Mystery Creek #304 in Idaho on July 23rd, 2022 and added to Troutnut.com by Troutnut on January 15th, 2023.


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Female Callibaetis ferrugineus (Speckled Dun) Mayfly Dun Pictures

Collection details
Location: Mystery Creek #304, Idaho
Date: July 23rd, 2022
Added to site: January 15th, 2023
Author: Troutnut
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