Affiliation: | Department of Zoology, Kyoto University, Sakyo, Kyoto 601-01, Japan;e-mail:;Department of Fisheries, University of Tokyo, Yayoi, Bunkyo, Tokyo 113, Japan;Department of Veterinary Medicine, Tokyo University of Agriculture &Technology, Saiwaicho, Fuchu, Tokyo 183, Japan;Department of Marine Resources, Tokai University, Orido, Shimizu, Shizuoka 424, Japan |