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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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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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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