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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.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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.

Brachycentrus americanus (American Grannom) Caddisfly Larva Pictures

This species of Brachycentrus was extremely common in mid-September kick net samples in the Yakima canyon.

Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Case view of a Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Ruler view of a Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington The smallest ruler marks are 1 mm.
Ventral view of a Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Dorsal view of a Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Submesal setae on the first abdominal segment.

Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington
Tibial spurs.

Brachycentrus americanus (Brachycentridae) (American Grannom) Caddisfly Larva from the Yakima River in Washington

This caddisfly was collected from the Yakima River in Washington on September 12th, 2020 and added to Troutnut.com by Troutnut on September 19th, 2020.


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Brachycentrus americanus (American Grannom) Caddisfly Larva Pictures

Collection details
Location: Yakima River, Washington
Date: September 12th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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