Keberadaan bakteri pada sedimen berperan penting dalam berbagai proses biokimia di perairan antara lain dalam degradasi materi organik, perputaran siklus biogeokimia, mengendalikan kadar amonium, nitrat dan nitrit, sumber makanan bagi fauna, produksi primer dan remediasi pencemaran. Tujuan Penelitian ini adalah untuk mengetahui keanekaragaman bakteri (Genus) pada sedimen di Kawasan Konservasi Mangrove dan Bekantan (KKMB) Kota Tarakan. Penelitian ini dilaksanakan pada bulan Maret sampai Mei 2018 dengan menggunakan metode deskriptif dengan melakukan identifikasi bakteri pada sedimen melalui beberapa tahapan pengujian yaitu uji gram, uji utama dan uji lanjut yang di lakukan di laboratorium Stasiun Karantina Ikan, Pengendalian Mutu dan Keamanan Hasil Perikanan kelas II Tarakan. Hasil penelitian menunjukan keanekaragaman bakteri pada sedimen sebanyak 16 bakteri (Genus) yaitu Enterobacteria sp., Eubacterium sp., Listeria sp., Actinobacillus sp., Bacteriodes sp., Streptococcus sp., Plesiomonas sp., Corynebacterium sp., Pseudomonas sp., Aeromonas sp., Bordetella parapertussis sp., Micrococcus sp., Staphylococcus sp., Clostridium sp., Neisseria sp., dan yang lebih dominan ditemukan yaitu Bacillus sp.
Kata Kunci: Bakteri, Keanekaragaman, KKMB, Sedimen

The presence of bacteria in the sediment plays an important role in the various processes biochemical in antaru waters in the degradation of organic matter, the rotation cycle Biogeochemistry, controlling the levels of ammonium, nitrate and nitrite, food sources for fauna, pollution remediation and primary production. The purpose of this research is to know the diversity of bacteria in sediments in Mangrove conservation area and the proboscis monkey (KKMB) Town of Tarakan. This research was carried out in March to May 2018 using the descriptive method with doing identify bacteria in sediment through several stages of testing IE test main test, grams and further tests main test, in the laboratory doing Quarantine Station of Fish, Quality Control and Safety Class II Fisheries Results Tarakan. Basil research showed the diversity of bacterian sediments as many 16 bacteria (Genus), namely Enterobaxteria sp., Eubacterium sp., Listeria sp., Actinobacillus sp., Bacteriodes sp., Streptococcus sp., Plesiomonas sp., Corynebacterium sp., Pseudomonas sp., Aeromonas sp., Bordetella parapertussis sp., Micrococcus sp., Staphylococcus sp., Clostridium sp., Neisseria sp., and most dominant found namely Bacillus sp. Keywords: Biodiversity, Bacteria, Sediment, KKMB