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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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

References

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

Caddisfly Species Rhyacophila vaccua (Green Sedges)

Taxonomy
Species Range
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