Keberadaan bakteri pada sedimen berperan penting dalam berbagai proses biokimia di perairan antara lain degredasi materi organik, perputaran siklus biogeokimia, mengendalikan kadar ammonium, nitrat dan nitrit, sumber makanan bagi fauna, produksi primer dan remediasi pencemaran. Tujuan penelitian ini adalah untuk mengidentifikasi bakteri (genus) pada sedimen di Kawasan Hutan Mangrove Mamburungan Kota Tarakan. Penelitian ini dilaksanakan pada bulan Desember 2018 – Maret 2019 dengan menggunakan metode identifikasi morfologi yang dilakukan di laboratorium Balai Karantina Ikan Pengendali Mutu dan Keamanan Hasil Perikanan Tarakan. Hasil penelitian menunjukkan keanekaragaman bakteri pada sedimen sebanyak 10 genus bakteri yaitu Micrococus sp., Corynebacterium sp., Listeria sp., Plesiomonas sp., Bacillus sp., Enterobacteria sp., Aeromonas sp., Clostridium sp., Actinobacillus sp., dan Bordetella parapertussis sp., dan yang lebih dominan ditemukan yaitu Bacillus sp.
Kata Kunci: Sedimen, Bakteri, Identifikasi, Mamburungan

The presence of bacteria in the sediment plays an important role in the various processes biochemical in waters in the degradation of organic matter, the cycle process biogeochemistry, controlling the levels of ammonium, nitrate and nitrite, food sources for fauna, pollution remediasi and primary production. The purpose of this research is the identification of bacteria genera in sediments of Mamburungan Tarakan mangrove conservations area. This research was carried out in December 2018 to March 2019 using a morphological identification method at laboratory Quarantine center of Fish, Quality Control and Safety Fisheries Results Tarakan. Research results showed the diversity of bacteria sediment as many 10 bacteria (Genus), namely Micrococus sp., Corynebacterium sp., Listeria sp., Plesiomonas sp., Bacillus sp., Enterobacteria sp., Aeromonas sp., Clostridium sp., Actinobacillus sp., dan Bordetella parapertussis sp., and most dominant found namely Bacillus sp. Keywords: Sediment, Bacteria, Identification, Mamburungan