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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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Osobenus yakimae (Yakima Springfly) Stonefly Nymph Pictures

This nymph keys out to Osobenus yakimae, and a comparison of the markings with a specimen on flyfishingentomology.com provides a good verification. The size is about right, as that species has been described as 12 mm. The markings generally fit the original description of the nymph of that species (Jewett 1955) perfectly.

Dorsal view of a Osobenus yakimae (Perlodidae) (Yakima Springfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Osobenus yakimae (Perlodidae) (Yakima Springfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Osobenus yakimae (Perlodidae) (Yakima Springfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Ventral view of a Osobenus yakimae (Perlodidae) (Yakima Springfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Ruler view of a Osobenus yakimae (Perlodidae) (Yakima Springfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.
Lateral view of a Osobenus yakimae (Perlodidae) (Yakima Springfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington

This stonefly was collected from the South Fork Snoqualmie River in Washington on June 13th, 2019 and added to Troutnut.com by Troutnut on June 14th, 2019.


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Osobenus yakimae (Yakima Springfly) Stonefly Nymph Pictures

Collection details
Location: South Fork Snoqualmie River, Washington
Date: June 13th, 2019
Added to site: June 14th, 2019
Author: Troutnut
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