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Mayfly Genus Caenis (Angler's Curses)

Taxonomic Navigation -?-
Species in CaenisNumber of SpecimensNumber of Pictures
Caenis amicaAngler's Curse00
Caenis hilarisAngler's Curse00
Caenis latipennisAngler's Curse00
Caenis tardataAngler's Curse00
Caenis youngiAngler's Curse00

7 species aren't included.
Common Names
Pictures Below
When the important hatches of Tricorythodes were first discovered by anglers, Caenis was given the credit. We now know that the Caenis mayflies are a different group, smaller and less common in trout streams, and they hatch in the evening instead of the morning.

They very rarely elicit selective feeding, but when they do they're very tough to match because they're often much smaller than size 28. This difficulty has earned them the nickname "Angler's Curse."

Where & When

Time Of Year (?): June through early September; best in June and July

Preferred Waters: Rivers and lakes

Most Caenis mayflies emerge in the evenings when other, larger mayflies are abundant on the water. This limits their importance.

Hatching Behavior

Caenis mayflies typically emerge, molt into spinners, mate, and oviposit within one hour.

Nymph Biology

Substrate: Silt, weeds

Every book says pools and stagnant back-waters are the prime habitats of these nymphs. This is probably true, but I have often found them in gravel, vegetation, and other habitats. They have operculate (
The operculate gills of a Caenis nymph.
The operculate gills of a Caenis nymph.
Operculate: Lidlike; usually used to describe the pair of enlarged elytroid gills (called the operculum) which some silt-dwelling mayfly nymphs like Caenis and Eurylophella have developed to shield their other gills from debris.
gills adapted to survival on silty bottoms.

Pictures of 11 Mayfly Specimens in the Genus Caenis:

Specimen Page:12
Caenis (Angler's Curses) Mayfly NymphCaenis (Angler's Curses) Mayfly Nymph View 3 Pictures
Collected June 5, 2005 from the Marengo River in Wisconsin
Added to by Troutnut on May 25, 2006
Caenis (Angler's Curses) Mayfly NymphCaenis (Angler's Curses) Mayfly Nymph View 4 Pictures
Collected June 8, 2005 from the Namekagon River in Wisconsin
Added to by Troutnut on May 26, 2006
Specimen Page:12

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