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.

Here Oksrukuyik Creek flows away from the Dalton Highway toward the pipeline. It eventually grows into one of the major rivers of the North Slope, and the main drainage to the west of the Sag, but where it crosses the road it's just a small grayling stream.

From Oksrukuyik Creek in Alaska

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

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.

8 Recently Added Photos

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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Caddisfly Species Nectopsyche diarina (White Millers)

Where & when

Time of year : Midsummer

This is an important species.

In 60 records from GBIF, adults of this species have mostly been collected during July (33%), June (28%), August (23%), and September (12%).

In 50 records from GBIF, this species has been collected at elevations ranging from 797 to 11401 ft, with an average (median) of 5610 ft.

Species Range

source

Map of specific collection sites

Larva & pupa biology

Current speed: Fast

Substrate: Rocks

Environmental tolerance: Prefers clear water

The preference of this species for fast, rocky habitat is unusual for the family Leptoceridae.

Start a Discussion of Nectopsyche diarina

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.