Orduzu lake (Malatya) fauna zooplankton

In this study, zooplankton fauna of Orduzu Lake were investigated. Samplings were taken montly form 4 different stations between April 2011 and May 2012. Water temperature, pH and dissolved oxygen of water were determined in situ. Zooplankton samples were taken by means of 55 µ mesh-sized standart plankton net and were preserved in 4% formaldehyde solution. In the study totally 47 zooplankton species were recorded. 35 rotifera species belonging to 15 families 9 Cladocera species belonging to 4 families, and 3 Copepode species belonging to 1 families were determined. As the result of Shannon Wiener species richness index analysis, species richness was found highest in may (H?=2,29). The least index value was found in september (H?=1). As the result of Sorenson Similaritiy İndex Sation I and II?s similarity was found highest with 74%and lowest value was recorded between stations I and IV with 69%. The dominant zooplankton species,Polyarthra dolichoptera was riched its maximum relative density with 73.4% in July. Among all zooplanktonRotifera was reptesented with 86.5%, Cladocera 10% and Copepoda 3.5% percentage. Key Words: Rotifera, Copepoda, Cladocera, Orduzu Lake