1. Cetacean Research Center, Graduate School of Bioresources, Mie University, Mie 514-8507, Japan
2. Shimonoseki Marine Science Museum, Yamaguchi 750-0036, Japan
3. Species Management Committee for Finless Porpoises of the Western Inland Sea, Fukuoka 811-0321, Japan
4. MARINE WORLD uminonakamichi, Fukuoka 811-0321, Japan
5. Oita Marine Palace Aquarium UMITAMAGO, Oita 870-0802, Japan