| dc.description.abstract | This study investigate the bacterial composition and nutritional value of bioflocs promoted by adding supplementary organic carbon into water collected from three production ponds of Penaeus vannamei at Binh Dinh Province. Results showed that bioflocs started to develop from the 2nd day and continue to grow till the end of the experiments. Obvious change of water colour from greenish to brownish, higher level of pH stabilization and faster removal of NH3-N were observed in all three trials applied with biofloc technology principles. Pure culture and isolation using Marine agar medium, followed by DNA sequencing revealed four most popular groups including Shewanella algae, Phyllobateriaceae bacterium, Bacillus subtilis and Bacillus licheniformis associated with the flocs collected from the experiments. The nutritional value of bioflocs formed in this study is however lower than expected, probably due to low input of supplementary organic carbon. Crude protein, lipid and ash of the flocs was 1.3 0.3 %, 0.3 0.1% and 3.3 0.6%, respectively. Further studies should focus more on feeding scheme of supplementary organic carbon and identification of the most suitable source of organic carbon.
Keywords: bioflocs; Penaeus vannamei, C/N ratio, microbial composition and nutrition value. | en_US |
