1. Department of Biological Sciences (S.K., Y.A., T.M., Y.O.), Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
2. Laboratories of Fish Biology (N.Y.), Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
3. Reproductive Science (S.Y., H.T., K.-i.M.), Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan