The protection of the marine environment from pollution is a matter of major importance. Remote sensing techniques provide non-intrusive measurements and coverage of large areas and optical sensors are particularly suitable because the visible radiation is the only part of the electromagnetic spectrum which shows a good penetration in the water column. Passive optical sensors have problems in coastal waters where a large quantity of suspended sediments and dissolved substances are present (class 2 waters), while fluorescence lidars [1] (active remote sensing) give a more detailed assessment of the water properties and allows the detection of parameters which can not be obtained by passive analysis. Lidar techniques have been used for oil spill detection and algae studies for quite a long time [2], but in the second half of the eighties the improvement of detector arrays allowed the development of high spectral resolution fluorosensors and therefore the introduction of new processing techniques for the analysis of marine parameters like water column temperature [3] and phytoplankton[4].