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Not AvailableIndustrial establishments along the head region of Patalganga River, at Raigad district, Maharashtra is developing since few decades. These manmade and natural stressors are destructing the ecological quality of Patalganga-Amba estuarine complex slowly. A study had conducted from October 2016 to December 2017 to know the phytoplankton abundance, distribution and its seasonal variations at Patalganga estuary. A total of 47 genera of phytoplankton were identified, out of that, 33 genera are diatoms (17 pennate and 16 centric diatom), 7 genera of din flagellate and 7 genera of other algae were observed from the study site. H’ and J’ observed were 2.503 to 2.506 and 0.94 to 0.97 respectively, indicates the study site was productive. The seasonal variations of physico-chemical qualities and the intrinsic properties of water body influence the sudden and frequent variations of phytoplankton population.Not Availabl