A strange Christmas tree

There is a superstition in Japan that the cause of earthquake is an eel. People of former days thought eel has magical power, I would say. In our time, we recoginize the existence of electric eel. So, I found news about electric eel.

KAKAMIGAHARA, Gifu -- An aquarium filled with exotic fish here is using an electric eel to power lights on a Christmas tree. Each time the electric eel at the Aqua Toto Gifu aquarium touches a copper wire in its tank, it sends power that lights up globes decking a Christmas tree.

It may be that we can use ell power generation in the future.
http://mdn.mainichi.jp/national/news/20071203p2a00m0na017000c.html