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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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Male Ephemera guttulata (Green Drake) Mayfly Spinner Pictures

This spinner was the only member of its species I saw all night during an incredibly thick and tricky mixed hatch on Penn's Creek a few days before the real start of its famous green drake hatch.

Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Lateral view of a Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Ruler view of a Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania The smallest ruler marks are 1 mm.
Ventral view of a Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Spinner from Penn's Creek in Pennsylvania

This mayfly was collected from Penn's Creek in Pennsylvania on May 26th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Spinner

green drake hatch on yellow creek
Posted by Liljrob on Jul 7, 2008
Last reply on Jul 7, 2008 by Liljrob
Is it just me or was the green drake hatch on yellow creek in PA the worst in a long time.

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Male Ephemera guttulata (Green Drake) Mayfly Spinner Pictures

Collection details
Location: Penn's Creek, Pennsylvania
Date: May 26th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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