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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
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.

Mystery Creek # 256 in Idaho

Stream photos

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Female Skwala (Large Springfly) Stonefly AdultFemale 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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Caddisfly Species Amiocentrus aspilus (Little Western Weedy Water Sedges)

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

In 23 records from GBIF, adults of this species have mostly been collected during July (35%), August (30%), May (13%), June (9%), and March (9%).

In 4 records from GBIF, this species has been collected at elevations of 6060, 6250, 6726, and 7005 ft.

Species Range
Map of specific collection sites

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
Amiocentrus aspilus (Little Western Weedy Water Sedge) Caddisfly Adult
4 Pictures
Lateral view of a Amiocentrus aspilus (Brachycentridae) (Little Western Weedy Water Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
Added by Troutnut on June 12, 2019
Collected August 10, 2018 from the Henry's Fork of the Snake River in Idaho and added by Troutnut on June 12, 2019

Start a Discussion of Amiocentrus aspilus

References

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

Caddisfly Species Amiocentrus aspilus (Little Western Weedy Water Sedges)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Trichoptera (Caddisflies)
  5. » Family Brachycentridae (Apple Caddis and Grannoms)
  6. » Genus Amiocentrus (Little Western Weedy Water Sedges)
  7. » Species aspilus (Little Western Weedy Water Sedges)
Species Range
Map of specific collection sites
Common Name
Resources
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