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 "Fountain Flats" stretch of the Firehole was fishable in the morning after an uncharacteristically cold August night.

From the Firehole River in Wyoming

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

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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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Mayfly Species Baetisca columbiana (Armored Mayflies)

Species Range

source

Specimens of the Mayfly Species Baetisca columbiana

1 Nymph

Baetisca columbiana (Armored Mayfly) Mayfly Nymph

1 Picture

Baetisca columbiana (Baetiscidae) (Armored Mayfly) Mayfly Nymph from the Flathead River-lower in Montana

This is also a very rare mayfly. This specimen was the first ever collected in western Montana. Only 5 specimens have been collected from this large river.

Collected July 4, 2007 from the Flathead River-lower in Montana

Added by Bnewell on June 26, 2011

Collected July 4, 2007 from the Flathead River-lower in Montana and added by Bnewell on June 26, 2011

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