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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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

8 Recently Added Photos

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 Penelomax septentrionalis Mayfly Dun Pictures

I'm confident this dun belongs to septentrionalis, because her legs are just too long for any other Ephemerellid, and her unusual mid-dorsal stripe matches those of two easily identified nymphs I collected some miles downstream.

This really pretty mayfly was in kind of bad shape when I found it crippled on the surface, and bouncing around in my container with a bunch of green drakes didn't help.

Ruler view of a Female Penelomax septentrionalis (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.

Lateral view of a Female Penelomax septentrionalis (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Female Penelomax septentrionalis (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Dorsal view of a Female Penelomax septentrionalis (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Ventral view of a Female Penelomax septentrionalis (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

This mayfly was collected from the West Branch of the Delaware River in New York on June 1st, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

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