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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.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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 Genus Dannella

Although Caucci and Nastasi write this genus off as unimportant in Hatches II, and most authors don't mention it at all, there are some who praise the localized hatches of Dannella simplex for providing good fishing.

Where & when

In 24 records from GBIF, adults of this genus have mostly been collected during July (42%), June (29%), August (13%), and April (8%).

In 10 records from GBIF, this genus has been collected at elevations ranging from 3 to 2559 ft, with an average (median) of 1901 ft.

Genus Range

Start a Discussion of Dannella

References

  • Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.

Mayfly Genus Dannella

Taxonomy
Species in Dannella: Dannella simplex
2 species (Dannella lita and Dannella provonshai) aren't included.
Genus Range
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