This study was conducted with the aim to determine the correlation between the composition and distribution of Rotifera and some water quality parameters in the mouth area of My Thanh river. Three sampling points with different characteristics were selected including (1) freshwater areas, (2) contiguous areas of freshwater and brackish water, and (3) estuarine areas adjacent to the sea. Qualitative and quantitative samples of Rotifera and some water quality parameters were monthly collected during the 6-month period in the dry season from November 2017 to April 2018. Multivariable analysis was applied to examine the correlation between water quality variation and the distribution and diversity of Rotifera at the sampling sites. A list of 48 species belonging to 25 genera were recorded. The freshwater area had higher number of Rotifera species and density than in the high salinity areas. The multivariable analysis result showed that there was negative correlation between the composition and density of Rotifera and the salinity. Higher salinity areas had lower number of species and density of Rotifera; there was positive correlation between number of Rotifera species and TP concentrations, especially species belonging to Brachionidae Family. Species belonging to that Family could be used as the bioindicator for the rich nutrient environment.
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