English summary: A wide variety of river and sea-run fish samples were collected at Hanoi local markets and analyzed for the concentrations of Polychlorinated biphenyls (PCBs) including non dioxin-like PCBs (PCB 28, 52, 101, 138, 153, 180) by gas chromatography (GC) with electron capture detection (ECD) and mass spectrometry (MS).