1. Department of Aquatic Science; Aquatic Animal Health Research Center; Faculty of Natural Resources; Prince of Songkla University; Had Yai Songkhla 90112 Thailand
2. Department of Aquatic Science; Faculty of Natural Resources; Aquatic Animal Health Research Center; Prince of Songkla University; Had Yai Songkhla 90112 Thailand
3. Department for Farm Animals and Veterinary Public Health; Clinical Division of Fish Medicine; University of Veterinary Medicine; Vienna A-1210 Austria