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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Female Hydropsyche (Spotted Sedge) Caddisfly Adult Female Hydropsyche (Spotted Sedge) Caddisfly Adult

Lateral view of a Female Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Columbia River 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 Rhyacophila torva (Green Sedges)

Where & when

Time of year : Early June

This species is most important in the Northeast.

In 42 records from GBIF, adults of this species have mostly been collected during June (26%), May (24%), July (21%), April (10%), September (7%), and August (7%).

In 24 records from GBIF, this species has been collected at elevations ranging from 561 to 5764 ft, with an average (median) of 2625 ft.

Species Range

source

Map of specific collection sites

Start a Discussion of Rhyacophila torva

References

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