Bioecology of Groupers at Karimunjawa Waters

Fish target groups in Karimunjawa waters consist of associated coral reef fish species such as grouper (Epinephelus sp. and Plectropomus sp.). This study aims to determine bioecology the condition of grouper in Karimunjawa waters. The study was conducted during 2011-2013. Data collection was performed using line transect method at 5-6 and 10-11 meters depth. The ecological value of grouper in waters Karimunjawa showed low diversity and the species of groupers is evenly distributed across the waters. There is species dominance in Cendikian Island. The species also showed closest similarity ( 95 %) in both the depth and formed 4 groups. The closest similarity ( 95 %) happened among the waters of north side of Kembang Islands Beetles (north side), Kembar Island and Batu Lawang. The condition of groupers in Karimunjawa waters is affected by physical-chemical factors, the availability of nutrients, fishing activities and community activity.