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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Baetidae (Blue-Winged Olive) Mayfly Nymph Pictures

Lateral view of a Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington
Dorsal view of a Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington
Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington
Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington
Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington
Ventral view of a Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington
This specimen is on top, photographed with a couple others of the same species showcasing some variations.

Baetidae (Blue-Winged Olive) Mayfly Nymph from Mystery Creek #308 in Washington

This mayfly was collected from Mystery Creek #308 in Washington on April 23rd, 2023 and added to Troutnut.com by Troutnut on May 2nd, 2023.


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Baetidae (Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Mystery Creek #308, Washington
Date: April 23rd, 2023
Added to site: May 2nd, 2023
Author: Troutnut
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