Zooplankton of Lake Elazığ Hazar

In this study organism in zooplankton of Hazar Lake and their seasonal variations were investigated between April 1994 - March 1996. Physical and chemical measurements and analysis of Lake water were also made. Zooplankton of the lake was composed of Rotifera, Copepoda and Cladocera and a total of 21 species and a larva were recorded. Rotifera, Copepoda and Cladocera were represented by 1 6, 2 and 3 species respectively. Rotifera was the most important group in the zooplankton with respect to species numbers and number of individuals. At station 1, zooplankton reached a maximum in autumn and at stations2, 3 and 4 maxima were recorded in summer. The lowest zooplankton numbers were recorded in winter at all stations. KEY WORDS: Zooplankton, Rotifera, Copepoda, Cladocera, Hazar Lake, Elazığ