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.

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

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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 Hydropsyche cockerelli (Spotted Sedges)

Where & when

Time of year : Late Spring and again in late Summer and early Fall, with the latter being more important

This species may be found across the country but it is only really important in the West.

In 52 records from GBIF, adults of this species have mostly been collected during July (33%), June (33%), August (23%), and May (10%).

In 12 records from GBIF, this species has been collected at elevations ranging from 2238 to 9506 ft, with an average (median) of 5900 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Morning

Start a Discussion of Hydropsyche cockerelli

References

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