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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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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 Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner Pictures

Lateral view of a Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana
Dorsal view of a Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana
Ventral view of a Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner from Mystery Creek #237 in Montana

This mayfly was collected from Mystery Creek #237 in Montana on August 1st, 2020 and added to Troutnut.com by Troutnut on August 18th, 2020.


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Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner Pictures

Collection details
Location: Mystery Creek #237, Montana
Date: August 1st, 2020
Added to site: August 18th, 2020
Author: Troutnut
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