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This study was performed to isolate bacteria that could control the nitrite levels in a biofloc technology (BFT) culture tank. Nitrite-eliminating bacteria were isolated from a BFT culture tank rearing goldfish, and the isolated bacterium exhibiting the most potent nitrite eliminating ability was labeled as the “NOBSB1” strain. Sequencing the 16S rRNA revealed that NOBSB1 is a species in the genera Bosea. NOBSB1 had the following characteristics with regard to nitrite removal: (1) it removed nitrite by functioning heterotrophically in the presence of a carbon source (sugars); (2) it eliminated nitrite most effectively within a temperature range of 20-30℃, but its activity decreased at temperatures above 35℃ and below 20℃; (3) it had optimum nitrite removal ability within a pH range of 6.0-8.0; (4) it removed nitrite more effectively under hypoxic than aerobic conditions. NOBSB1 inoculation did not decrease ammonia or nitrate levels, but eliminated nitrite in a BFT culture tank rearing common carp (Cyprinus carpio). After inoculating the NOBSB1 strain in a BFT culture tank, NOBSB1 controlled and sufficiently reduced the nitrite concentration in the tank.
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Nitrate-Metabolic Characteristic of Mesophilic Nitrite Producer Bacteria Isolated from Baby Food
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