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Red discolouration (bloom) over the Chatham Rise on Tuesday 15 November 2011 caused by mass accumulation of tiny dinoflagellate cells (Noctiluca scintillans). At night these algae phosphoresced when disturbed by the ship's progress. This gives Noctiluca the popular names "Sea Ghost" or "Fire of Sea".
More information on algal blooms (harmless, such as Noctiluca scintillans, as well as harmful): Eye in the sky: tracking harmful algal blooms with satellite remote sensing