1. Otsuchi Marine Research Center, Ocean Research Institute; University of Tokyo; Otsuchi Iwate 028-1102 Japan
2. Department of Disease Control, Graduate School of Veterinary Medicine; Hokkaido University; Sapporo Hokkaido 060-0818 Japan
3. Department of Comparative Pathology, Graduate School of Veterinary Medicine; Hokkaido University; Sapporo Hokkaido 060-0818 Japan
4. Marine Biotechnology Institute Co., Ltd.; Kamaishi Iwate 026-0001 Japan
5. International Marine Biological Research Institute; Kamogawa Sea World; Kamogawa Chiba 296-0041 Japan
6. All-Russian Research Institute for Nature Protection; Moscow Russia
7. Caspian Scientific Research Institute; Astrakhan Russia