Blue-Winged Olive BWO is one of the most important and versatile dry flies for imitating small mayflies from the Baetis group. It is especially effective during year-round hatches, including colder periods when fish consistently feed on small but steady insect activity. Its natural olive-grey profile and compact shape make it highly realistic, while the parachute hackle provides excellent flotation and strong visibility.
This is a must-have pattern for clear rivers where trout and grayling often feed selectively on small BWO mayflies.
Best for: Trout, Grayling
Ideal conditions: BWO hatches, spring and autumn, cool weather, moderate to fast currents.
Specifications
- FliesDry Fly