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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Diphetor hageni (Little Blue-Winged Olive) Mayfly Nymph Pictures

Dorsal view of a Diphetor hageni (Baetidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Diphetor hageni (Baetidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
This specimen is missing one of its cerci (tails) and all the gills on the left side, but I didn't have a more intact one available.

Diphetor hageni (Baetidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Ventral view of a Diphetor hageni (Baetidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Diphetor hageni (Baetidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington
Ruler view of a Diphetor hageni (Baetidae) (Little Blue-Winged Olive) Mayfly Nymph from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.

This mayfly was collected from Mystery Creek #249 in Washington on July 25th, 2019 and added to Troutnut.com by Troutnut on July 26th, 2019.


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Diphetor hageni (Little Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: July 25th, 2019
Added to site: July 26th, 2019
Author: Troutnut
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