Blue Butterfly Fish (1994)
Original title: B.B. フィッシュ
Blue Butterfly Fish is a 1994 Japanese-language animation movie directed by Mamoru Hamatsu, with a running time of 30m. It stars Emi Shinohara, Nobutoshi Canna and Yuri Amano.
Ushio is a freediver with strange powers. He and his friends are at a tropical land in search of a rare fish, the Blue Butterfly. This pursuit leads them to Ayuuru, a local girl who might know where to find the legendary fish.