Some water quality parameters (Secchi disk depth, water temperature, dissolved oxygen, pH, conductivity, chlorophyll a, NO2-N, NO3-N, NH4-N, PO4-P) and zooplankton fauna were determined in the Kozan Dam Lake. While the quality of the reservoir water was first class water in terms of temperature, dissolved oxygen, NH4-N, PO4-P, it was second-class water in terms of conductivity, pH, NO3-N. In total, 50 zooplankton species belonging to 26 families were determined (29 species belonging to 17 families from Rotifera, 15 species belonging to 7 families from Cladocera and 6 species belonging to 2 families from Copepoda). Brachionidae (Rotifera) was the most species rich family with 7 species, followed by Chydoridae (Cladocera) and Cyclopidae (Copepoda) with 6 and 5 species respectively. The most dominant species were Synchaeta pectinata (38.33%) from Rotifera, Bosmina longirostris (5.71%) from Cladocera and Cyclops vicinus (0.67%) from Copepoda. At the same time, the species found in every month were Asplanchna priodonta, Polyarthra dolichoptera, Bosmina longirostris, Ceriodaphnia pulchella, Cyclops vicinus and Diacyclops bicuspidatus. In the study, Rotifera was the most abundant group with 67%, followed by Cladocera with 29% and Copepoda with 4%. On the other hand, total Rotifera was found mostly in December (10099 individual/ m 3 ), Cladocera in January (4928 ind./m 3 ) and Copepoda in September (1091 ind./m 3 ).Öz: Kozan Baraj Gölü'nde bazı su kalitesi parametreleri (Secchi derinliği, su sıcaklığı, çözünmüş oksijen, pH, iletkenlik, klorofil a, NO2-N, NO3-N, NH4-N, PO4-P) ve zooplankton faunası belirlenmiştir. Baraj gölü suyu sıcaklık, çözünmüş oksijen, NH4-N, PO4-P açısından birinci sınıf su iken, iletkenlik, pH, NO3-N açısından ikinci sınıf sudur. Rotifera'dan 17 familyaya ait 29 tür, Kladosera'dan 7 familyaya ait 15 tür ve Kopepoda'dan 2 familyaya ait 6 tür olmak üzere toplam 50 tür tespit edilmiştir. Brachionidae (Rotifera) 7 türle en zengin familya olup, bunu 6 ve 5 tür ile Chydoridae (Cladocera) ve Cyclopidae (Copepoda) familyalarının takip ettikleri belirlenmiştir. En baskın türün Rotifera'dan Synchaeta pectinata (%38,33), Kladosera'dan Bosmina longirostris (%5.71) ve Kopepoda'dan Cyclops vicinus (%0.67) olduğu belirlenmiştir. Araştırmada her ay bulunan türler rotiferlerden Asplanchna priodonta, Polyarthra dolichoptera, kladoserlerden Bosmina longirostris, Ceriodaphnia pulchella, kopepodlardan Cyclops vicinus ve Diacyclops bicuspidatus'tur. Çalışmada Rotifera'nın %67 ile en çok bulunan grubu oluşturduğu, bunu %29 ile Kladosera'nın ve %4 ile Kopepoda'nın takip ettiği bulunmuştur. Öte yandan toplam Rotifera'nın en çok Aralık'ta (10.099 birey/m 3 ), Kladosera'nın Ocak'ta (4.928 birey/m 3 ) ve Kopepoda'nın Eylül'de (1.091 birey/m 3 ) bulundukları belirlenmiştir.
The effect of aquaculture on water quality (Dissolved Oxygen, temperature, pH, conductivity, NO2-N, NO3-N, NH4-N, PO4-P and chlorophyll-a) and zooplankton fauna was investigated in Kozan Dam Lake. As a result of the study, it was determined that fish farming did not have a statistically effect on zooplankton fauna and water quality parameters, but it caused some minor changes. In the study, a total of 50 zooplankton species were identified, including 29 from rotifers, 15 from cladocerans and 6 from copepods and Asplanchna priodonta, Polyarthra dolichoptera, Bosmina longirostris Ceriodaphnia pulchella were found in both stations every month during the study. While the reference station had more species in January, February, March, April, May, June, August, October and November than in the cage station, more species were found in the cage station only in September and November than in the reference station. The annual zooplankton abundance was 3.118±3.927 ind/m 3 at the cage station and 2.552±2.452 ind/m 3 at the reference station. Rotifer species and abundance were higher at the cage station whereas cladocer and copepod species and abundance were higher at the reference station. In the study, the species found only in the cage station were Lecane bulla and Disparalona rostrata while the species found only in the reference station were Cephalodella gibba, Filinia terminalis and Macrothrix laticornis.
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