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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) 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 Rhyacophila pellisa (Green Sedges)

Gary LaFontaine in Caddisflies reports finding both pupae and adults of this species frequently in his stomach pump samples.

Where & when

Time of year : Summer

In 46 records from GBIF, adults of this species have mostly been collected during August (39%), July (30%), June (17%), and May (9%).

In 34 records from GBIF, this species has been collected at elevations ranging from 1300 to 10741 ft, with an average (median) of 8681 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Morning

Egg-Laying behavior

Time of day: Morning

Start a Discussion of Rhyacophila pellisa

References

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