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¹ Ege University, Fisheries Faculty, Department of Hydrobiology, Section of Limnology, 35100, Bornova, İzmir, Turkey DOI : 10.4194/1303-2712-v11_4_21 Viewed : 4006 - Downloaded : 3016 This study aims to determine the zooplankton fauna of Yuvarlak Stream that is located at Köyceğiz-Dalyan Specially Protected Area, where the samples were collected in monthly intervals May 2001-April 2002 from 10 stations (8 in Yuvarlak Stream, 2 in Köyceğiz Lake). Plankton samples were collected horizontally by plankton net with a mesh size of 55 μm and hand net with a mesh size of 60 μm. Specimens obtained were than preserved in 4% formalin. As a result of qualitative analyses, a total of 84 taxa were identified from Yuvarlak Stream, including 53 taxa from Rotifera, 20 taxa from Cladocera and 11 taxa from Copepoda. All species are recorded for the first time from the study site, except for Brachionus plicatilis, Keratella quadrata, Keratella cochlearis and Calanipeda aquaedulcis, which were previously reported from Köyceğiz Lake. Keywords : Rotifera, cladocera, copepoda, zooplankton, Yuvarlak Stream