Mayfly Species Paraleptophlebia debilis (Blue Quill)

This widespread species can produce memorable hatches where it is locally abundant.  

Where & When

This species is most important in the fall, when the hatch is at its greatest concentration and there are few competing insects on the water. It occurs across the continent and may be reinforced by Paraleptophlebia praepedita in the East or Paraleptophlebia bicornuta in the West.

Hatching Behavior

Time Of Day (?): Midday
Water Temperature: 50-55°F

Spinner Behavior

Time Of Day: Afternoon

Nymph Biology

Current Speed: Moderate

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