1. Laboratory of Fish Biology; Graduate School of Bioagricultural Sciences; Nagoya University; Furo-cho, Chikusa-ku; Nagoya 464-8601 Aichi Japan
2. Division of Seasonal Biology; National Institute for Basic Biology; Nishigonaka 38 Myodaiji Okazaki 444-8585 Aichi Japan
3. Laboratory of Animal Physiology; Graduate School of Bioagricultural Sciences; Nagoya University; Furo-cho, Chikusa-ku; Nagoya 464-8601 Aichi Japan