The fish tank that's so big it can hold FOUR whale sharks Eighty species live in the Kuroshio Sea tank, including yellow-fin tuna, bonito (a type of large mackerel) and manta rays. But the daddy of them all is the world's biggest fish, the whale shark - which can grow to be 12 metres long and needs a quarter of a tonne of food every week. YouTube - Kuroshio Sea - HD Watch it in HD and full View with volume up.....enjoy !!!