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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 Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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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Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

This mature nymph is associated with the dun from the same location and date posted on this hatch page. Size 10mm.

This mayfly was collected from the Fall River in California on November 12th, 2011 and added to Troutnut.com by Entoman on December 15th, 2011.


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Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

Collection details
Location: Fall River, California
Date: November 12th, 2011
Added to site: December 15th, 2011
Author: Entoman
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