ISSN 2620-570X JURNAL ILMU KELAUTAN KEPULAUAN, 1 (1) ; 15 – 29, JUNI 2018 15 Assessing fish community structure at two different coral reef depths around Seribu Islands, Jakarta (Penilaian struktur komunitas ikan terumbu pada dua kedalaman terumbu karang berbeda sekitar Kepulauan Seribu, Jakarta) Karizma Fahlevy 1,2 , Firsta Kusuma Yudha 1,3 , Wedi Andika 1,2 , Ahmad Eko Suprianto 1,2 , Nadya Jeny Irianda 1,2 ,Mas Irfanto 1,4 , Beginer Subhan 2 , Hawis Madduppa 2 1 Fisheries Diving Club, Bogor Agricultural University, Bogor 16880, Indonesia 2 Department of Marine Science and Technology, Bogor Agricultural University, Bogor 16880, Indonesia 3 Department of Aquatic Resources Management, Bogor Agricultural University, Bogor 16880, Indonesia 4 Department of Aquaculture, Bogor Agricultural University, Bogor 16880, Indonesia e-mail : karizmafahlevy@yahoo.com ABSTRACT Coral reefs structure play important roles for reef fish assemblages. Coral coverage and reef fish abundance are associated with the positive relationship. However, the relationship between reef fish abundance and composition and depth variation around Pramuka Island is poorly known. This study was carried out to investigate the biodiversity and the trophic level of fish communities between two different depths (3 and 10 m) around Pramuka Island regions (Pramuka Island and Sekati Island). The hard coral at the depth of 10 m within both study sites in Pramuka island held significantly higher percent cover than the depth of 3 m except in Dock 2 A total of 2620 individual fishes were counted, belonging to 58 species and 13 families. The fish community in 3 and 10 depth was dominated by omnivorous fishes. The multivariate analysis of fish abundance using the Bray Curtis similarity index and non-metric multidimensional scaling (NMDS) clearly showed the clustering of two different depths. The NMDS results showed that at the depth of 10 m are more clustered than 3 m depth. The present study results showed that the biodiversity of reef fishes around Pramuka Island seemed to be linked to the hard coral condition and depth. Keywords: Coral, Depth, Reef fishes, Trophic level I. Introduction The complexity of coral reefs structure play important roles in reef fish assemblages (Alvarez-Filip 2011) and contribute to a differences ecosystem services that value to humans (Lane et al., 2013). Several studies have shown the relationships between various coral and the species richness of fishes. Komyakova et al., (2010) were reported positive correlations between coral and reef fish abundance. Corals are threatened by local disturbances, coral disease (Subhan et al., 2011), coral mining (Subhan et al., 2008) and environmental condition (Friedlander et al., 2017). Seribu Islands located in front of Jakarta and belong to one of the marine national parks in Indonesia (Fahlevy et al., 2017). However, the existences of coral reef in Seribu Islands are threatened. Environmental pressures (e.g pollution) from Jakarta increases the degradation of marine biodiversity in Seribu Islands (Baum et al., 2015).