The Waterhen Bloa is associated with the ‘North Country’ school. This spider pattern is fished successfully during hatches of olives, like Baetis rhodani, which some texts claim it’s meant to represent. Brown trout and grayling are its typical target species.
How to fish:
Traditionally fished ‘upstream and across’ like the other spider patterns, or on the swing, and dead drift. The fly can be fished on its own or as part of a team.