Diffuse pollution, Biomarkers, Benthic assemblages, Harbours, Industrial areas, Caged mussels, Up-Regulation, Biomarkers - analysis, Environmental Monitoring - methods, Gonads - drug effects, Estuaries, Vitellogenins - genetics, Mytilus - drug effects, Water Pollutants, Chemical - analysis, Spain, Industry, Gonads - metabolism, Animals, Water Pollutants, Che...