The present study was undertaken on physico-gas-chemical parameters in seasonal variation from January-2014 to December 2014. The seasonal variations in parameters such as temperature, salinity, pH, dissolved oxygen, biological oxygen demand and nutrients like nitrate, nitrite, ammonia, total nitrogen, inorganic phosphate, reactive silicate and total suspended solids were studied in Cuddalore coastal waters, Southeast coast of India, for a period of one year during the postmonsoon, summer, premonsoon and monsoon seasons. Surface water temperature varied from 24.0°C to 34.2°C. Salinity varied from 30.2‰ to 35.4‰ and the pH ranged between 8.10 and 8.40. Variation in dissolved oxygen content varied from 3.86 to 6.94 mg/l and the biological oxygen demand varied from 0.297 to 1.387 mg/l. The concentrations of nutrients viz. nitrite, nitrate, ammonia, total nitrogen, inorganic phosphates, total phosphate and reactive silicates 0.094 to 1.963; 1.327 to 4.625; 0.085 to 1.985; 2.535 to 9.262; 0.215 to 2.967; 0.736 to 5.068 and 1.392 to 21.639 µmol/l respectively. The total suspended solids 42 to 123 mg/l were also recorded in the study period.
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