Bacteria Associated with White Band Syndrome from Cultured Coral (Platygyra daedalea)

Authors

  • Pattarajit Raksachon ภาควิชาวาริชศาสตร์ คณะวิทยาศาสตร์ มหาวิทยาลัยบูรพา
  • Praparsiri Barnette ภาควิชาวาริชศาสตร์ คณะวิทยาศาสตร์ มหาวิทยาลัยบูรพา
  • Narinratana Kongjandtre ภาควิชาวาริชศาสตร์ คณะวิทยาศาสตร์ มหาวิทยาลัยบูรพา
  • Anchalee Chankong ศูนย์วิจัยและพัฒนาทรัพยากรทางทะเลและชายฝั่งอ่าวไทยฝั่งตะวันออก

Abstract

Cultured immature corals (Platygyra daedalea) affected by White Band Syndrome (WBS), were classified based on white plague area on coral surface into four categories; (0), WBS absent; (+1), WBS present over 10 - 20% of coral surface; (+2), 30 - 60% and > 60%, (+3). Coral tissue was examined for bacterial infection by directed enumeration of total bacteria and total Vibrio spp. Density of total Vibrio spp. in culture tank water (means ± SE) amounted 5.49 ± 1.1 for category (0), 2.45 x 102 ± 1.48, (+1), 4.89 x 103 ± 1.2, (+2), and 6.16 x 103 ± 1.26, (+3), CFU/ml. Total bacteria in culture tank water was higher with than total Vibrio spp. (means ± SE) at 2.63 x 103 ± 1.48 for category (0), 1.62 x 103 ± 1.1, (+1), 6.91 x 103 ± 1.51, (+2), and 8.13 x 104 ± 1.55, (+3), CFU/ml. Furthermore, processed coral tissue scrapings from WBS had higher densities of total Vibrio spp. and total bacterial than water in those culture tanks with means ± SE for the former 6.46 x 104 ± 1.62 category (0), 2.14 x 105 ± 1.12, (+1), 4.68 x 105 ± 1.38, (+2), and 3.39 x 106 ± 1.09, (+3), CFU/ml., infections. Total bacteria of processed coral tissue scrapings had higher densities with means ± SE 1.28 x 105 ± 3.31 for category (0), 5.62 x 105 ± 3.98, (+1), 1.02 x 106 ± 2.57, (+2), and 6.03 x 106 ± 4.89, (+3), CFU/ml. infections. WBS of coral tissue was significantly correlated with total bacteria (n = 4, r = 0.879), and total Vibrio spp. (n = 4, r = 0.892), respectively. Thus, total bacteria and Vibrio spp. virulence was positively and significantly correlated with WBS. Dominant bacteria were V. parahaemolyticus and V. alginolyticus. Overall, results implied that bacteria accumulation in culture tank water may impose a stress to healthy coral and so, further study should be conducted to confirm bacterial etiology. Generally, basic principles of cleanliness should be applied routinely to all aspects of coral culture.Keywords:  bacteria, coral disease, Platygyra daedalea, Vibrio spp., White Band Syndrome

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Published

2017-09-28