Early Black Stonefly
Capnia / Allocapnia
StoneflyMidday
Water-temperature trigger
30°F38–50°Fpeak 42°F80°F
- Duration
- 4 weeks
- Also called
- Little Black Stonefly · Winter Stonefly
Top fly patterns
- Black Stonefly #16-18
- Black Beadhead Nymph #16
- Small Black Stimulator #16
Cold-water freestone stonefly, often seen crawling on snow banks. Trout key on the nymphs more than adults.