The Port of Genoa (44.40-44.43°N, 8.75-8.94°E) (Fig.1), located in the Gulf of Genoa, lays over a surface of 7 km2 along about 20 km of coastline; itswater depth varies between 9 and 15 m, with a maximum of 50 m in the Multedo Oil Terminal for super-tankers. The harbour receives domestic and industrial effluents both through the watercourses and through sewage treatment waters discharges. Therefore, significant amounts of nutrients are released in a semienclosed basin, producing a phosphorus and nitrogen enrichment.