S. Manjappa, B. Suresh, E.T. Puttaiah, Seasonal Variation of Hyto Lankton in Tungabhadra River near Harihar-Karnataka, Research Journal of Biological Sciences, Volume 6,Issue 2, 2011, Pages 65-68, ISSN 1815-8846, rjbsci.2011.65.68, (https://makhillpublications.co/view-article.php?doi=rjbsci.2011.65.68) Abstract: The present study deals with the study of the seasonal changes in phytoplankton population in Tungabhadra river from Harihar, Karnataka. From the selected 3 stations of Tungabhadra river water samples were collected at monthly intervals. Qualitative and quantitative analysis of phytoplankton were carried out during the year 2003-2004. About 71 species of phytoplankton were found comprising Chlorophyceae 35.47%, Bacilleriophyceae 18.11%, Cyanophyceae 37.48% and Euglenophyceae 8.93%. The peak of the phytoplankton population was observed during summer. Keywords: summer;Tungabhadra river;poopulation;Phytoplankton;seasonal variation;India