"Enjoy it while you can," says Professor Theodore Bestor of Harvard University. He's referring partly to Tsukiji's famous fish market and partly to sushi and to the fact that "some species are at risk of becoming commercially extinct."

We are meeting to discuss his book "Tsukiji: The Fish Market at the Center of the World" (University of California Press). The future of Tsukiji fish market, scheduled for a move, is uncertain enough without worrying about the finite resources of the sea. Will there even be enough fish to sell at the new Tsukiji?

Bestor, a leading expert on Tsukiji outside of Japan, is in Tokyo to put the finishing touches on the translated Japanese version of his book, to be published by Kirakusha and scheduled to be on bookshelves in November.