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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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 Spinner Pictures

Lateral view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Dorsal view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Ventral view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Ruler view of a Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1 mm.

This mayfly was collected from the Henry's Fork of the Snake River in Idaho on August 1st, 2020 and added to Troutnut.com by Troutnut on August 18th, 2020.


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Female Callibaetis ferrugineus (Speckled Dun) Mayfly Spinner Pictures

Collection details
Location: Henry's Fork of the Snake River, Idaho
Date: August 1st, 2020
Added to site: August 18th, 2020
Author: Troutnut
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