Zooplankton samples were taken seasonally from Hancağız Dam Lake between April 2012-May 2013 period. During the study, a total of 52 species (34 belong to genus Rotifera, 11 to Cladocera and 7 Copepoda) were found in Hancağız Dam Lake. Based on the number of individuals, rotifers were the dominant group in the dam lake (65.4%) followed by Cladocera (21.2%) and Copepoda (13.4%). All of the zooplanktonic species have been detected for the first time in Hancağız Dam Lake. The datas determined from the zooplankton community in Hancağız Dam Lake wereanalysedbyShannonWienerspeciesrichnessindex (H ı ), Margalef diversity index(D) and Sorenson similarity index. H ı value was found highest with 3.73 in spring. D index value was calculated in its highest level in spring with 6.31.

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