Affiliation: | Graduate School of Biosphere Science, Hiroshima University, Higashi-hiroshima, 739-8528,; Hiroshima City Marine Products Promotion Association, ShokôCenter, Hiroshima, Hiroshima 733-0833;and Research Laboratories, Aquaculture Center, Kyowa Hakko Kogyo Co. Ltd, Ube, Yamaguchi 755-8501, Japan |