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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 Cinygmula mimus

Where & when

In Mayflies: An Angler's Study of Trout Water Ephemeroptera , Knopp and Cormier report "occasional" fishable hatches of this species from southern Alberta, and its known range extends down the east slope of the Rockies into the United States.

Hatching behavior

Time of day : Late July through early September

Nymph biology

Environmental tolerance: Prefers cool water

Specimens of the Mayfly Species Cinygmula mimus

2 Male Spinners
1 Female Spinner

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Species Range
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