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The study of marine phytoplankton and its fluorescence properties were also fully investigated before a series of sea trials were conducted. These sea trials involved the deployment of the optical fibre probe/s under various conditions. The system was found to have a detection limit of 0.1 mu g/l for marine phytoplankton in realtime. Using dye tracers in conjunction with the OFAF was also investigated, in particular with a particulate dye tracer whose physical properties can be altered to mimic the target species under investigation. The particulate dye tracer was used in applications such as sediment movement in harbours, sewage effluent monitoring and water discharges from oil platforms in the North Sea. The system was found to have a detection limit of 10-9 M and 10-8 M respectively for Fluorescein and Rhodamine ‘B’. 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