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Approved for public release; distribution is unlimited. ABSTRACT fkfaxinrmn 2W words)Oceanic and coastal bioluminescence in surface waters, in many instances, is produced by microscopic dinoflagellates. Their light emission is usually observed at a maximum during the night hours and markedly inhibited during the day. This diel periodicity has never been observed in situ for identified species and never before in heterotrophic Proto ' nrzdinium dinoflagellates. Pronounced differences in stimulable bioluminescence measured with bathvphotometers in Vesttjord. Norway in September 1990 correlated with simultaneous ship-board laboratory experiments. Cells of both the photosynthetic Cerattum fusus and heterotrophic Protoperidinium cui-tipes showed a pronounced inhibition of bioluminescence during the day and maximum bioluminescence at night. Oceanic and coastal bioluminescence in surface waters, in many" instances., is produc. e by microscopic dinoflagellates. Their light emission is usually observed at a maximumi during the night hours and markedly inhibited during the day. This die! periodicity has never been observed in situ for identified species and never before in heterotrophic I'rotoperidin iutn dinoiflagellates. Pronounced differences in stimulable bioluminescence measured with bathvphotometers in Vestfjord, Norway in September 1990 correlated with simultaneous ship-board laboratory experiments. Cells of both the photosynthetic Ceratiuim frisus and heterotrophic Protoperidinium curtipes showed a pronounced inhibition of bioluminescence during the day and maximum bioluminescence at night. 93-I12979' SU&IECT TERMS