1. Aquaculture Department (AQD), Southeast Asian Fisheries Development Center (SEAFDEC), Tigbauan, 5021 Iloilo, Philippines
2. Faculty of Education, Shinshu University, 6 Nishi-Nagano, Nagano 380-8544, Japan
3. National Research Institute of Fisheries Science, 1088 Komaki, Ueda, Nagano 386-0031, Japan
4. Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-cho, Nagasaki 852-8521, Japan