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Nhóm san hô dạng cành Acropora ở các vùng Nha Trang. Ninh Thuận và Phú Quốc có tỷ lệ tẩy trắng rất cao, trong khi tại Côn Đảo thì ngược lại. Các giống Porites, Montipora, Millepora đều bị tẩy trắng cao ở các vùng trong khi 2 giống Galaxea và Diploastrea hầu như không bị ảnh hưởng. | Vietnam Journal of Marine Science and Technology Vol. 20 No. 4A 2020 55 60 DOI https doi.org 10.15625 1859-3097 15649 http www.vjs.ac.vn index.php jmst Bleaching of coral in Nha Trang Ninh Thuan Con Dao and Phu Quoc islands in June July 2019 Phan Kim Hoang Vo Si Tuan Thai Minh Quang Dao Tan Hoc Hua Thai Tuyen Institute of Oceanography VAST Vietnam E-mail phkimhoang@yahoo.com Received 28 August 2020 Accepted 26 October 2020 2020 Vietnam Academy of Science and Technology VAST Abstract The studies on coral bleaching were conducted at 21 sites of 4 reef areas in Southern Vietnam using point transect technique in June July 2019. Cover of hard corals in the selected sites was quite high with the average values of 65.6 18 in Con Dao islands 58.7 26.2 in Ninh Thuan coastal waters 55.9 17.8 in Phu Quoc island but lower in Nha Trang bay 22.8 15.9 . Soft corals were not abundant with the highest cover in Nha Trang bay 4.73 5.5 and the lowest in Ninh Thuan 0.16 0.3 . Hard corals were most impacted in Nha Trang bay with 39.5 8.1 bleached followed by Ninh Thuan reefs 32.9 13.3 Con Dao Islands 25.0 11.1 and least affected in Phu Quoc island 7.3 9.05 . For soft corals ratios of bleached corals were 79.4 65.8 and 23.8 in Con Dao islands Nha Trang bay and Ninh Thuan reefs respectively. No bleached soft coral was recorded in Phu Quoc. At the genus level Acropora corals were severely affected in Nha Trang bay Ninh Thuan reefs and Phu Quoc island but not impacted in Con Dao islands. The Porites Montipora Millepora genera were quite vulnerable in all sites but no bleaching was observed for Galaxea and Diploastrea genera. Keywords Coral bleaching Con Dao Phu Quoc Nha Trang Ninh Thuan. Citation Phan Kim Hoang Vo Si Tuan Thai Minh Quang Dao Tan Hoc Hua Thai Tuyen 2020. Bleaching of coral in Nha Trang Ninh Thuan Con Dao and Phu Quoc islands in June July 2019. Vietnam Journal of Marine Science and Technology 20 4A 55 60. 55 Tạp chí Khoa học và Công nghệ Biển Tập 20 Số 4A 2020 55 60 DOI .
