Yesterday I posted about my experiences with soft-hackled sakasa kebari, and what should I see this morning on TenkaraUSA's blog but a post on Fujioka-san's study of traditional tenkara flies!
Take a look, there's not a whole lot of information, but it will give you a general idea of the different sorts of flies commonly used in Japan:
I'm particularly intrigued by the stiff hackled flies. Soft-hackles are just so logical to me for wet flies! As I find with a lot of new knowledge, this little study makes for more questions than answers.