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DOI : 10.17693/yunusae.v16i21960.235789 Viewed : 2655 - Downloaded : 1441 The study was carried out seasonally in 2009 in Gölkent 1 Reservoir, Gölkent 2 Reservoir and Topboğazı Dam Lake, located within the borders of Hatay province. While temperature was lower in winter in every sampling localities, dissolved oxygen was high for the same period. When the temperature was found high in summer, dissolved oxygen was found low. pH values did not show change depending on the season. In the study, 7 species from Copepoda, 8 species from Cladocera, a total of 15 species were identified. Most species (15 species) were found in the spring, and Bosmina longirostris and Cyclops vicinus determined to be the most abundant species. It was determined the body length of most species reached in winter season. Moina micrura, Ceriodaphnia pulchella, Diaphanosoma birgei, Alona rectangula, Eudiaptomus drieschi produced eggs all sampling periods and Chydorus sphaericus produced three sampling periods except winter. Keywords : Cladocera,Copepoda,abundance,body length,egg number