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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.

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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Skwala (Large Springfly) Stonefly Nymph Pictures

This one took an embarrassingly long time to identify, because the key I was following sent me on a wild goose chase when I interpreted the longitudinal dorsal stripe on the abdomen of this specimen as a "longitudinal pigment band." I've updated the key text on this site so that mistake isn't so easy for others to make.

Ruler view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington The smallest ruler marks are 1 mm.
Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Ventral view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
One of the lacinia separated from the head

Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Other side of the same lacinia separated from the head

Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington

This stonefly was collected from the Yakima River in Washington on April 24th, 2022 and added to Troutnut.com by Troutnut on April 27th, 2022.


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Skwala (Large Springfly) Stonefly Nymph Pictures

Collection details
Location: Yakima River, Washington
Date: April 24th, 2022
Added to site: April 27th, 2022
Author: Troutnut
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