The monthly variations of physico-chemical parameters were studied during January to December 2012 in the Coleroon estuary southeast coast of India. The water temperature ranged between 21.5 and 33.2°C. Salinity fluctuated between 9.6 and 31.4 psu. The pH ranged from 7.5 and 8.3. The DO was ranged from 3.14 to 5.8 mg/l. The nutrients such as nitrite, nitrate, inorganic phosphate and silicate ranged from 0.23 to 1.4 µmol/l, 3.57 to 10.91 µmol/l, 0.4 to 1.7 µmol/l and 28.73 to 68.9 µmol/l respectively. The DO and nutrients was found to be low in summer and high during monsoon season. Similarly temperature, pH and salinity were low during monsoon and high during summer season.
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