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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.

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
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 Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner Pictures

Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho
Dorsal view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho
Ventral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho
Ruler view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho The smallest ruler marks are 1 mm.
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from Red Rock Creek in Idaho

This mayfly was collected from Red Rock Creek in Idaho on August 1st, 2020 and added to Troutnut.com by Troutnut on August 18th, 2020.


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Female Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner Pictures

Collection details
Location: Red Rock Creek, Idaho
Date: August 1st, 2020
Added to site: August 18th, 2020
Author: Troutnut
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