1. Center
for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho
2-5, Matsuyama, Ehime 790-8577, Japan
2. Graduate School
of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku,
Sapporo 060-0818, Japan
3. Nakatsu Veterinary
Surgery, 2-2-5, Shorinjichonishi, Sakai-ku, Sakai, Osaka 590-0960, Japan