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Cyanobacterial biodiversity from different freshwater ponds of Thanjavur, Tamilnadu (India). Studies on the cyanobacterial biodiversity of 5 different freshwater ponds in and around Thanjavur, Tamilnadu during summer month (June, 2004) has been made and compared their variations among five different ponds. In addition, certain physico-chemical parameters of pond waters such as dissolved oxygen, net productivity, pH, carbonate, bicarbonate, nitrate, nitrite, total phosphorus, inorganic phosphorus etc. were also analyzed and statistically compared with the cyanobacterial diversity. Totally 39 species of 20 genera of cyanobacteria were recorded in all 5 different ponds. Only 6 species of cyanobacteria were identified in Pond 1 (Dabeerkulam), where a massive bloom of Microcystis aeruginosa was recorded, which had a significant effect in reducing the other cyanobacterial population. As many as five species namely Aphanothece microscopica, Synechocystis aquatilis, Merismopedia glauca, Oscillatoria limnetica and O. subbrevis were common in all the ponds surveyed except in Pond 1.