Colored DOM (CDOM) which has LDK 378 in the UV–Visible region constitutes a significant fraction of DOM of natural waters. The UV-fluorescent DOM (FDOM) is a further fraction of CDOM. The CDOM (and FDOM) are principally contributed by terrestrial inputs in lakes, estuaries and the coastal region. When these regions become productive the CDOM is also significantly contributed by the living processes e.g., phytoplankton excretion, zooplankton and bacterial metabolism (Coble, 2007). Optical characterization through the absorbance spectra and more recently EEM spectra and their parallel factor (PARAFAC) analysis have been immensely helpful in tracing the DOM inputs and removal mechanisms (Coble, 2007). To our knowledge, there are no reports of how an eddy influences the optical characters of DOM. The objective of this paper was to investigate whether CDOM and FDOM can track a coastal meso-scale eddy and how the phytoplankton responds in the new ecosystem. We also investigated whether any CDOM anthropogenic marker such as petroleum hydrocarbons occur in the coastal waters.