Correlation between the diversity and primary production index of phytoplanktons of Manakudy estuary in Kanyakumari District, Tamil Nadu, India was assessed from January to December 2009. Average phytoplankton primary production varied significantly during the period of study. Maximum diversity and primary productivity were record in the months of February to April. The inflow of water during the monsoon into the reservoir was the prime factor that influenced input of the nutrients and appeared to enhance the primary production during this period. Shennon ââ?¬â?? Weiner diversity index varied between 1.232 and 1.667 during the period of study. Likewise, Sympson index varied from 0.812 to 0.868 and evenness from 212 to 546. The value of annual average of phytoplankton biomass was 186 Nos-1. The value of annual average of gross primary production and net primary production were 2318 mg C/m3/d and 1530 mg C/m3/d respectively.
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