Catching tiny fish only a couple of centimeters in size called Tanago, or Japanese bitterling, is a passion shared by some fanatical Japanese anglers. Fumihiko Nagatani, a sushi chef with 40 years of experience catching the so-called "underwater jewels," uses a microscope to file down fishing hooks in the hope of catching small Tanago less than 2cm long. Discover the eccentric yet fascinating world of Japanese "micro fishing" that involves tiny tools to catch tiny fish.