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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.

Caddisfly Species Leucotrichia pictipes (Ring Horn Microcaddis)

Where & when

Time of year : Late spring and summer

This species is abundant across the northern United States. It can be extremely abundant -- Gary LaFontaine tells in Caddisflies of a population estimate putting this species at 5,000 per square foot in parts of the Madison River. If have found it very abundant in the Midwest as well, though probably not quite to that extreme. You can see this in my underwater photos.

Hatching behavior

Time of day : Any time

Egg-Laying behavior

LaFontaine describes the unique egg-laying behavior of this species in Caddisflies:

[W]hen the females return to lay their eggs and crawl down the backside of the rocks, so many slip into the currents that trout stack up behind midstream obstructions.

Larva & pupa biology

Current speed: Fast

2 Underwater Pictures of Leucotrichia pictipes Caddisflies:

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Species Range
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