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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.

The trees were leafing out and the trout were rising on this productive Wisconsin stream

From the Namekagon River in Wisconsin

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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.

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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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Updates from July 13, 2004

Updates from July 13, 2004

Closeup insects by Troutnut from Miscellaneous Wisconsin and the Couderay River in Wisconsin

3
Female Leucrocuta hebe (Little Yellow Quill) Mayfly Dun

Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from unknown in Wisconsin

4
Female Stenacron (Light Cahill) Mayfly Dun

Female Stenacron (Heptageniidae) (Light Cahill) Mayfly Dun from the Couderay River in Wisconsin

4
Male Hexagenia limbata (Hex) Mayfly Dun

Ruler view of a Male Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from unknown in Wisconsin The smallest ruler marks are 1/16".

3
Female Callibaetis ferrugineus (Speckled Dun) Mayfly Dun

Female Callibaetis ferrugineus (Baetidae) (Speckled Dun) Mayfly Dun from unknown in Wisconsin

2
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun

Ruler view of a Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun from unknown in Wisconsin The smallest ruler marks are 1/16".

I've tentatively called this fragile, highly damaged dun a Serratella species. I had much better pictures of the species but lost them. It's about size 22, but good-sized trout were rising to this hatch; I suspect it has to do with the solid profile shown by the dark, almost-black wings that have given this hatch the name "Darth Vaders" among some Wisconsin anglers.

2
Male Ephemera simulans (Brown Drake) Mayfly Spinner

Ruler view of a Male Ephemera simulans (Ephemeridae) (Brown Drake) Mayfly Spinner from unknown in Wisconsin The smallest ruler marks are 1/16".

This one hatched in the middle of July, which is very late for this species.

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