The Eku was,
and is, a genuine tool of Okinawan fisherman. Its popularity
was obviously greatest in fishing areas, like Tomari and some
of the outlying islands.
The Okinawan oar is only slightly shorter in length than a Bo,
and has a long narrow paddle. One side of the paddle is flat,
or gently convex, while the other side is peaked. The tip is
rounded or slightly pointed.
Its systemization is related greatly to the Bo, but its techniques
take advantage of its unique structure. There are techniques
for scooping sand into an enemy's face, striking with either
end, chopping with the edges and percussive strikes with the
The oar has not been very popular in Japan, however, it is not
uncommon among high level Karate-ka on Okinawa.