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Overloading of ammonia and nitrite nitrogen in aquaculture can result in toxicity to aquatic animals. In order to eliminate the hazardous substances, a highly efficient denitrifying bacterium, Bacillus sp. SC16, was identified in a fishery pond and isolated subsequently. The strain SC16 could remove nitrate up to 97%, ammonia up to 36.6%, and nitrite up to 99.99% when incubated with nitrate at an initial concentration of 306.9 mg·L−1 for 72 h, ammonia at 165.49 mg·L−1 for 48 h, and nitrite at 200 mg·L−1 for 24 h under aerobic conditions. The nitrite reductase gene was identified as the nirK gene. The transcriptional levels of the nirK gene in strain SC16 incubated with ammonia, nitrate, and nitrite showed similar expression patterns. When the strain SC16 was used to treat the aquaculture water, the concentration of ammonia decreased significantly, from 8.35 mg·L−1 to 4.56 mg·L−1, and there was almost no accumulation of nitrite by the end of experiment. Therefore, the results indicated that Bacillus sp. SC16 could be a promising candidate for aquaculture water treatment.

Isolation and Characterization of an Aerobic Denitrifier Bacillus sp. SC16 from an Intensive Aquaculture Pond