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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

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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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 vaccua (Green Sedges)

Where & when

Time of year : Late summer and fall

This is a common species in the Pacific Northwest.

In 21 records from GBIF, adults of this species have been collected during September (43%), August (33%), July (14%), and October (10%).

In 5 records from GBIF, this species has been collected at elevations ranging from 131 to 5873 ft, with an average (median) of 2920 ft.

Species Range

Hatching behavior

Time of day : Afternoon

Egg-Laying behavior

Time of day: Afternoon

Start a Discussion of Rhyacophila vaccua


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

Caddisfly Species Rhyacophila vaccua (Green Sedges)

Species Range
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