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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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Caddisfly Species Rhyacophila vocala (Green Sedges)

This is a common mountain caddisfly.

Where & when

Time of year : Early to mid-Summer

In 9 records from GBIF, adults of this species have been collected during July (33%), June (22%), April (22%), May (11%), and August (11%).

In 5 records from GBIF, this species has been collected at elevations ranging from 1700 to 4721 ft, with an average (median) of 3750 ft.

Species Range

Larva & pupa biology

Substrate: Boulders

Environmental tolerance: Prefers cold water

Specimens of the Caddisfly Species Rhyacophila vocala

1 Larva

Start a Discussion of Rhyacophila vocala


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

Caddisfly Species Rhyacophila vocala (Green Sedges)

Species Range
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