Header image
Enter a name
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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 Amiocentrus aspilus (Little Western Weedy Water Sedge)

This species produces fishable hatches across the West.

I encountered them in mid-August on the Henry's Fork, mating in thick swarms up and down the bank of the Harriman Ranch reach. However, millions of Tricorythodes mayflies found their way onto the water that same morning and it's unclear if the trout were seeing and responding to the caddisflies at all.

Where & when

Time of year : March to October; LaFontaine reports peaks in late June and in September

Preferred waters: Best in spring creeks

Species Range

Larva & pupa biology

Substrate: Vegetation

Larvae of this species are especially prone to behavioral drift early in the season.

Specimens of the Caddisfly Species Amiocentrus aspilus

1 Adult

Start a Discussion of Amiocentrus aspilus


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

Caddisfly Species Amiocentrus aspilus (Little Western Weedy Water Sedge)

Species Range
Troutnut.com is copyright © 2004-2023 (email Jason). privacy policy