Mayfly · Aquatic insect
Large Green Dun
Ecdyonurus insignis
Size
10–13mm
Hook size
#12–10
Hatch window
Season June–SeptemberPeak time 14:00–19:00
Water temperature
14° peak
10°19°
Hatches from 10°C, peaking at 14°C, tailing off by 19°C.How fish feed on it
The returning female is a better prospect than the dun ever was, for the same reason. Summer evenings over rough water.
Flies that imitate this
Greenwell's Glory
March Brown
Ecology
Where you'll find this
- British IslesCommon
- Atlantic fringeOccasional
- Continental EuropeOccasional
- ScandinaviaScarce
- IberiaScarce
- The AlpsScarce
Common Occasional