Abstract

• The aim of this paper is to study the seasonal changes of eutrophication levels of coastal sea water around the Kayindaung in Tanintharyi Coastal Area. Sea water samples were collected from three different sites around Kayindaung in Tanintharyi Coastal Area. Sampling sites were recorded with GPS detector. Some chemical properties such as DO, orthophosphate (inorganic phosphate), organic phosphate, total phosphate and total nitrogen were determined. In this paper, the measured DO values were in the range of 6.86 ppm to 8.21 ppm. The values of orthophosphate, organic phosphate and total phosphate were found to be in the range of 0.014 ppm to 0.186 ppm, 5.311 ppm to 7.838 ppm and 5.325 ppm to 7.969 ppm in seasonally and annually collected sea water samples, respectively. The total nitrogen value in the studied area was found in the range of 0.560 ppm to 1.586 ppm for seasonally and annually collected samples. For eutrophication assessment, the determination of nutrient levels of all sea water samples in hot season were low nutrient-enrichment (oligotropic) and in rainy and cold season were medium nutrient-enrichment (mesotropic) for both seasonally and annually collected samples.