1. Department of Biology; School of Science and Engineering, Loyola Schools, Ateneo de Manila University, Katipunan Avenue, Loyola Heights, Quezon City 1108; Manila Philippines
2. Aquaculture Department; Southeast Asian Fisheries Development Center, National Highway, Tigbauan 5021; Iloilo Philippines
3. The United Graduate School of Agricultural Sciences; Kagoshima University, Korimoto 1-21-24, Kagoshima City 890-8580; Japan