海洋科学技術センター試験研究報告 第45号 JAMSTECR, 45（March 2002） 17 Skeletal growth history of modern corals in Sekisei Lagoon as a bio-indicator Tamano OMATA ＊１ Mineo OKAMOTO ＊２ Yasuo FURUSHIMA ＊１ We collected 82 samples of Porites coral cores from Sekisei Lagoon, South Ryukyus in October and November, 2000, two years after the 1998 bleaching event worldwide. For measuring the growth rate of core samples, we present growth characteristics before and after the bleaching event. Results show that the growth rates in the north area are markedly lower than those in the south area. This implies that the stress in the north areas as evidenced by growth histo- ry of Porites was always stronger than that in the south areas. Keywords : Coral band, Sekisei Lagoon, X-ray image, growth history ＊１ Marine Ecosystems Research Department ＊２ Global Ocean Development Inc.