Amazing, I just looked the aquarium up on wikipedia-
Aquarium
The aquarium is a part of the Ocean Expo Commemorative National Government Park located in Motobu, Okinawa. The main tank called the 'Kuroshio Sea' holds 7,500-cubic meters (1,981,290 gallons) of water and features the world's second largest acrylic glass panel, measuring 8.2 meters by 22.5 meters with a thickness of 60 centimeters.[1] Whale sharks and manta rays are kept amongst many other fish species in the main tank.
On 16 June 2007 at 10:25 PM a manta ray was born at the aquarium after a gestation of 374 days [1].
The aquarium is one of very few that keep whale sharks in captivity, and is currently trying to breed them.