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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 Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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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Kogotus Stonefly Nymph Pictures

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.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
Ruler view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington The smallest ruler marks are 1 mm.
Ventral view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This stonefly was collected from Mystery Creek #199 in Washington on June 19th, 2023 and added to Troutnut.com by Troutnut on June 21st, 2023.


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Kogotus Stonefly Nymph Pictures

Collection details
Location: Mystery Creek #199, Washington
Date: June 19th, 2023
Added to site: June 21st, 2023
Author: Troutnut
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