Affiliation: | 1. Laboratory of Fisheries Oceanography, Department of Fisheries, Faculty of Agriculture, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, 113, Tokyo, Japan 2. Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, 164, Tokyo, Japan 3. 691-1 Mori, Kasumi-cho, Kinosaki-gun, 669-65, Hyogo Pref., Japan
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