Stan Wright on Oahu used to post fairly frequently on the TUSA forum about fishing in salt water with a tenkara rod. Oddly I just discovered he co-hosted a tv show, “Let’s Go Fishing”, with Hari Kojima for a few years starting just a few months before I left Hawaii. I had no idea he was a tv personality there.
Anyway, here’s an old post he did on TUSA forum, Tenkara Rod Barracuda Fly? That includes some advice from Chris Stewart and Stephen McGowan. There may be other post by Stan about how he fishes salt water using a tenkara rod.
Never tried it myself. It always seemed way to windy on N.C. outer banks. Present plans are to go to Topsail Beach last week of May. Sometimes I take a surf casting rig or more frequently in recent years take a detour from tenkara’s rod, line, fly, and simplify to: line, lure and hand line spool. (where btw my concern about thin braided line cutting my hand comes from)
Many people would consider using a tenkara rod for salt water sea fishing as verboten.
(just don’t call it tenkara fishing to keep the tenkara police at a distance)
But it is done even in Japan.
Do an internet search with 海テンカラ釣り and see for yourself.