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Research on the spatial distribution of phytoplankton was held in the green mussel aquaculture area, Kamal Muara, North Jakarta. The research aimed to obtain the abundance and spatial distribution of phytoplankton and the influencing environmental parameters. The study was necessary to conduct in order to determine the useful or harmful phytoplankton groups in the location, which will affect the quality of green mussel for consumption.Thalasiossira and Chaetoceros from Bacillariophyceae, which will be harmful in a bloom condition, were the most abundantly found phytoplankton in the area. Based on distribution maps, the abundance of Bacillariophyceae and Dinophyceae were highest at stations near the mainland, whereas Cyanophyceae was at farther stations. Spearman’s correlation values indicated that the abundance of Bacillariophyceae was most influenced by pH, Dinophyceae by salinity, whereas Cyanophyceae was influenced by phosphate.Keywords: Kamal Muara, phytoplankton, spatial distribution.

SPATIAL ANALYSIS ON PHYTOPLANKTON IN GREEN MUSSEL AQUACULTURE AREA, KAMAL MUARA, NORTH JAKARTA