MOTOBU, JAPAN - FEBRUARY 26:  A eight-metre-long Whale shark swims with other fish  in a worlds' largest tank with its front panel size of 8.2 metre x 22.5 metre at the Okinawa Churaumi Aquarium on February 26, 2010 in Motobu, Okinawa, Japan. Japan's most popular aquarium attracts more than 2.5 million visitors per year.  (Photo by Koichi Kamoshida/Getty Images)