Affiliation: | Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Kushiro, Hokkaido 085-0802,; National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Saeki, Hiroshima 739-0452,; Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-0821;and Marine Ecology Research Institute, Kashiwazaki, Niigata 945-0322, Japan |