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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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Landscape & scenery photos from Mongaup Creek

Mongaup Creek in New York

Underwater photos from Mongaup Creek

Several Baetidae nymphs line up on a rock.

From Mongaup Creek in New York
Mongaup Creek in New York
Mongaup Creek in New York
Mongaup Creek in New York

On-stream insect photos from Mongaup Creek

Here's an above-the-water view of a stillborn Ephemerella subvaria dun which I also photographed from below the water.

From Mongaup Creek in New York

Closeup insects by Troutnut from Mongaup Creek in New York

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