Affiliation: | Fish Feed Section, Inland Station, National Research Institute of Aquaculture, Tamaki, Mie 519-0423,;Reproductive Technology Section, National Research Institute of Aquaculture, Nansei, Mie 516-0193,;Research Coordinating Section, National Research Institute of Fisheries Science, Yokohama, Kanagawa 236-8648 and;Department of Biosciences, Teikyo University of Science and Technology, Uenohara, Yamanashi 409-0133, Japan |