Urine, Polyaromatic hydrocarbon, Biomarker, Carcinus maenas, Synchronous fluorescence spectrophotometry, Spectrometry, Fluorescence - methods, Brachyura - metabolism, Animals, Seawater - analysis, Analysis of Variance, Environmental Monitoring - methods, Polycyclic Aromatic Hydrocarbons - analysis, England, Water Pollutants, Chemical - analysis, Feasibility...