Synergetic of nitrifying and denitrifying bacteria isolates derived from catfish, Pangasius sp. culture pond. Issue 1 (October 2021) - Yosmaniar,
Abstract: Intensive aquaculture can cause a high concentration of nitrogen compounds that affected water quality and the sustainability of cultivated fish. The purpose of this study was to evaluate the synergetic of nitrifying and denitrifying bacteria in controlling nitrogen compounds. The experiment was the combination among eight bacterial isolates based on in vitro. Four isolates of nitrifying bacteria (NP1, NP2, NP3, and NP4) and four isolates of denitrifying bacteria (DP1, DP2, DP3, and DP4). All of bacteria were inoculated at a density of 10 2 cells of each. The experimental design used was factorial with two treatment factors, namely four nitrifying isolates as the main treatment and four denitrifying isolates as sub-treatment and each treatment used three replications. The result of experiment showed that combination of nitrifying and denitrifying bacteria isolates which can utilizing ammonia, nitrite, and nitrate compounds very well found at combination of NP2 and DP1 isolates and NP2 and DP 2 isolates.