The aim of this research was to know correlation Butterflyfishes (Chaetodon octofasciatus) as indicator toward to percentage cover of coral branching at Ayer Island, Archipelago of Seribu, Jakarta. The research result would give description about coral condition mainly about kind of coral branching based on abundance of Chaetodon octofasciatus. This research was held on 15-17 Decembers 2008. Th…