NIFREL, a new facility produced by KAIYUKAN, is not like an aquarium or a zoo but allowing visitors to intuitively experience the beauty and wonder of living creatures. Ofcourse otters are on exhibition.
Here's a new post about Fuji Safari Park ( Shizuoka Pref. ) I visited there to see swimming elephants, but unfortunately I could't see it.
I visited Kofu City Yuki Park Zoo, Yamanashi pref.