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Blue-winged Olives

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.

Mayfly Species Dannella simplex (Blue-Winged Olive)

Although by no means a superhatch, this species can be important. Authors who discuss it lament the general lack of credit it receives for the fine hatches it produces on some streams.

Where & when

Time of year : June through mid-September, but best in June and July

Hatching behavior

Time of day : Morning

Spinner behavior

Spinner falls are sparse and unimportant.

Nymph biology

Current speed: Slow

Substrate: Silt

These nymphs have operculate gills on segment four. This adaptation protects their other gills from the loose silt covering the bottom in the slow backwaters and pools they prefer.

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Species Range
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