Polychlorinated Biphenyls - analysis, Seawater - microbiology, DNA, Ribosomal - analysis, Molecular Sequence Data, In Situ Hybridization, Fluorescence, Seawater - chemistry, Colony Count, Microbial, Phylogeny, Electrophoresis, Agar Gel - methods, Water Pollutants, Chemical - analysis, Gram-Negative Bacteria - isolation & purification, Sequence Analysis, DNA,...