Mayfly Species Heterocloeon anoka (Blue-Winged Olive)
Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
» Family Baetidae (Blue-Winged Olives)
» Genus Heterocloeon (Blue-Winged Olives)
» Species anoka (Blue-Winged Olive)
Common Names
| Match | Common Name |
 | Blue-Winged Olive |
 | Little Slate-Winged Olive Quill |
Fly Imitations by Orvis
| Stage | Fly Pattern |
| Dun | Blue Winged Olive |
Read the Procloeon page for more information which is probably applicable to this similar species.
Where & When
Region: MidwestTime Of Year (?): Late June through late July; again from August through October
Hatching Behavior
Fred Arbona says of the Heterocloeon anoka hatching behavior in Mayflies, the Angler, and the Trout that:[T]he little nymph can easily crawl out of the water during emergence, and therefore the trout are able to consume them en masse very close to the bank.
This is somewhat open to interpretation, and I suspect many of these mayflies emerge on the surface as well.
Nymph Biology
Substrate: Gravel, vegetation
The nymphs are reported to prefer shallow water near the banks.
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