Abstract: This study aims to determine the zooplankton fauna of Meric river where the samples were collected in monthly intervals March 2011 to February 2012 from 8 stations. At the end of the study, 52 species from Rotifera, 22 species from Cladocera and 12 species from Copepoda were observed. And also some chemical and physical parameters as pH, dissolved oxygen, water temperature and conductivity were determined and found to be in suitable values for zooplankton life.