Affiliation: | 1. Fish Ecology Section, National Research Institute of Fisheries Science, 1088 Komaki, Ueda, 386, Nagano, Japan 2. Laboratory of Applied Zoology, Faculty of Agriculture, Hokkaido University, N9W9, Kita-ku, Sapporo, 060, Hokkaido, Japan 4. Laboratory of Embryology and Genetics, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate, 041, Hokkaido, Japan
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