The aquarium is really big and I very curious to see the whale sharks. The tank they live in is one of the or the biggest tank in the world I believe. The ticket was 1,850 yen, which in my opinion was a little on the steep side. In the end though, there was much to see. However I think that an after 16:00 ticket (1,250 yen) might be a bit more affordable. Also it gets a little bit less crowded after 16:00