Studies on Red Tide and Toxic Phytoplankton in Coastal Areas of South Western Pacific

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The objective of the studies on Red Tide and Toxic Phytoplankton in Coastal Areas of South Western Pacific is to make clear the relationship between eutrophication and outbreaks of red tide phenomena in south east asia.According to the report on the appearance of Pyrodinium bahamense var. compressa, which cause PSP toxication, along the coast of Bandar Beri Segawan of Burnei Darussalum, the survey carried out the end of May, 1989. The theacate shell excysted was found in bottom sediment. In Masinrok Bay which locate north east of Manila, Philippines about 100 cysts of P.bahamense in 1 g bottom mud were counted and the red tide is anticipated in next year. The survey in Gulf of Thailand and Chao Phraya River were carry on November 1989. Five dinoflagellates were isolated. Among them Chattonella sp. cf. marina was the first isolation from the water of Gulf of Thailand. Noctilica scintillas of the Gulf of Thailand have a symbiotic alga, Pedinomonas noctiluca. The culture of P.noctiluca was also tried and the medium devised by the survey sustained the culture of species at about 2 weeks. Nutrient concentrations in water of Chao Phraya River and the Gulf of Thailand were also estimated. Chao Phraya River water were eutrophicated in high levels but they was considerably decreased in sea water. This seems to be caused by the adsorption of the nutrients on suspended matter at the river mouth. The deterioration of sediments near the river mouth seems to be proceeding to deteriorate.