Seaweeds produce great variety of metabolites benefit for human. Red seaweeds (Rhodophyta) are well known as producer of phycocolloids such agar, agarose, carragenan and great variety of secondary metabolites. This review discusses the red algal secondary metabolites with antibacterial activity. The chemical constituents of red algae are steroid, terpenoid, acetogenin and dominated by halogenated compounds mainly brominated compounds. Novel compounds with intriguing skeleton are also reported such as bromophycolides and neurymenolides. In summary, red seaweeds are potential sources for antibacterial agents and can serve as lead in synthesis of new natural medicines.

The objective of this research was to determine the condition of coral reefs, namely the percentage of coral covered, species distribution, community structure of coral, and the environmental conditions surround the core zone, protection zone, tourism zone, and residential zone in Kepulauan Seribu Marine National Park DKI Jakarta. The research was conducted from 8 to 16 May, 2013. The data was collected from four zones and each zone was set up into two stations as a point observation, at the depth of 79 meters. The percentage of coral coverring was calculated by line intercept transect method, coral genera was counted and identified using the belt transect method. Coral data was analyzed qualitatively based on ecological index. The results showed that the coral covering was range from 7.25 to 68.