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Caddisfly Species Brachycentrus americanus (American Grannom)

Pictures Below

Where & When

Regions: East, Midwest, West

Time Of Year (?): July and August

This species is most prolific in the West and Midwest, but it may still be of concern to fishermen in the East.

Hatching Behavior

Time Of Day (?): Morning

Special thanks to Lloyd Gonzales, author of the excellent new book Fly-Fishing Pressured Water, for helping to sort out the Brachycentrus species and common names.

Pictures of 3 Caddisfly Specimens in the Species Brachycentrus americanus:

Female Brachycentrus americanus (American Grannom) Caddisfly AdultFemale Brachycentrus americanus (American Grannom) Caddisfly Adult View 1 PicturesSize 11 mm. Prior to this photo the specimen dropped its large egg mass that was a very dark (almost black) olive sphere almost twice the diameter of the abdomen. Notice the abdomen visible through the wings is both thickened and shortened post egg drop.
Collected October 15, 2011 from the Fall River in California
Added to by Entoman on October 21, 2011
Brachycentrus americanus (American Grannom) Caddisfly LarvaBrachycentrus americanus (American Grannom) Caddisfly Larva View 18 PicturesThis species of Brachycentrus was extremely common in mid-September kick net samples in the Yakima canyon.
Collected September 12, 2020 from the Yakima River in Washington
Added to by Troutnut on September 19, 2020
Brachycentrus americanus (American Grannom) Caddisfly LarvaBrachycentrus americanus (American Grannom) Caddisfly Larva View 13 PicturesBoth the genus ID (Merritt & Cummins) and species ID (Flint 1984) are pretty confident for this larva, a nice example of a common western caddisfly. It was by far the most abundant insect in my kicknet sample on this trip, and many of the rocks in the fast riffle where I sampled had dozens of these larvae clinging on.
Collected July 6, 2020 from the Dosewallips River in Washington
Added to by Troutnut on July 12, 2020

Recent Discussions of Brachycentrus americanus

Brachycentrus americanus on the Lower Sacramento River California
Posted by Troutguide on Oct 29, 2016
I believe this is the species found in sometimes very large numbers on the Lower Sacramento River in the Redding area. Ten years ago it was present in such large numbers that fishing a fly on the bottom resulted in frequently hooking one of these caddis still in its case. Along with other aquatic insects their numbers have declined to a fraction of once seen. I don't believe the egg Sac dropped by the females to be olive , instread I have seen it to be a bright green. The females seem to oviposit close to the edge of flowing water and not midstream.

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