This is the best of the sporadic summer hatches known to anglers as Light Cahills. It was formerly known as Stenonema canadense and is considered by most angling historians as the model for that classic Catskill pattern. Where & When
» Species interpunctatum (Light Cahill)
Regions:Stenacron interpunctatum emergence is quite sparse, but it can be important because there is so little competition on the water on late-season evenings.
East, MidwestTime Of Year (?):
Mid-May through late August, peaking in late June and early July
The best hatching in the East is in late June an early July, and in the Midwest this species peaks about a month later.Hatching Behavior
Time Of Day (?):This species emerges more gracefully than the related duns of Maccaffertium and Stenonema, and emerger patterns take on less importance. They drift for a while as duns, and that is the stage to imitate, although the nymphs preparing for emergence can also be of value.Spinner Behavior
Sporadically all afternoon and evening in cool streams; concentrated in the evening in warm weatherHabitat:
Time Of Day: Twilight or after dark; may be earlier on cloudy daysStenacron interpunctatum flies return to the stream as spinners a couple days after hatching.
The females oviposit while laying on the water.Nymph BiologyCurrent Speed: Medium to fast
Substrate: Gravel, detritus (Detritus: Small, loose pieces of decaying organic matter underwater.)
Environmental Tolerance: Tolerant of warm temperatures, but not pollution
Pictures of 3 Mayfly Specimens in the Species Stenacron interpunctatum:
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