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Microbiologically influenced corrosion (MIC) is a threat to hydrotest, which is a critical step in confirming whether a pipeline can be commissioned. Seawater is frequently used in hydrotesting large pipelines. In this biofilm prevention study, an oilfield biofilm consortium was grown in an enriched artificial seawater followed by anaerobic incubation at 37 °C for up to 60 days. The combination of 100 ppm (w/w) 2,2-dibromo-3-nitrilopropionamide (DBNPA) + 100 nM (180 ppb) Peptide A (a biofilm dispersal agent) led to extra SRB (sulfate reducing bacteria), APB (acid producing bacteria) and GHB (general heterotrophic bacteria) sessile cell count reductions of 0.9-log, 0.8-log and 0.6-log, respectively, compared with the outcome obtained by 100 ppm DBNPA only. The cell count reductions led to enhanced mitigation of carbon steel corrosion weight loss and pitting corrosion, which were corroborated by electrochemical measurements.