Management Implication of Corals Settlement on Concrete Artificial Reefs in Pramuka Island Waters, Kepulauan Seribu, DKI Jakarta.

Abstract

Latest stage development of coral recruits community on concrete artificial reefs were observed for nine months (from October 2009 to July 2010) by visual census and underwater photography methods. Amounts of 10 units of concrete artificial reef deployed in Pramuka Island waters and Gosong Pramuka in 2001 were used as an objects in this research. As a comparation, the condition of coral coverage and reef fishes in natural reef were observed by line intercept transect, quadrate transect, visual census, and underwater photography methods. In order to measure coral coverage area we used ImageJ 1. 42q software. In March 2010, amounts 457 coral colonies from 21 genera and 216 coral colonies from 16 genera were found in Station 1 and Station 2 respectively. In July 2010, the percentage of coral coverage on concrete artificial reefs reaches 41.46±13.37% (mean±SD) in Station 1 and 20.38±6.08% (mean±SD) in Station 2, while the percentage of coral coverage on natural reefs were 23.14% and 40.43% in Station 1 and 2 respectively. The coral recruits coverage on concrete artificial reefs had a strong positive relationship with its fish abundance in Station 1 where coefficient of determination (R2) reached 0.71.