Monthly variations of physico-chemical characteristics were carried out in freshwater carp culture ponds at Kumbakonam area Thanjavur district, Tamil Nadu, India, for a period of seven months (September 2014 to March 2015). Nine various physico-chemical parameters were analyzed by using standard methods (APHA, 1998). Water temperature varied from 25.7 to 31.5ºC, pH ranged from 6.8 to 8.2. Turbidity was from 21.8 to 36.7 cm, Dissolved oxygen content varied between 4.23 to 6.77 mg/L, calcium (22.7 to 48.6 mg/L), phosphate (0.78 to 0.125), nitrate (0.019 to 0.38 mg/L) and ammonia (0.23 to 0.48 mg/L) also varied independently.
