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.

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Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington

This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.

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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.

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Female Baetidae (Blue-Winged Olive) Mayfly Dun Pictures

I captured this dun on the same night as a spinner which is probably of the same species.

Lateral view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Dorsal view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Ventral view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York

Ruler view of a Female Baetidae (Blue-Winged Olive) Mayfly Dun from the West Branch of Owego Creek in New York The smallest ruler marks are 1 mm.

This mayfly was collected from the West Branch of Owego Creek in New York on August 9th, 2006 and added to Troutnut.com by Troutnut on August 11th, 2006.

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