In this study, the digestive system contents of Cyprinus carpio Linnaeus, 1758 have been deter- mined. The annual distributions of the organisms in the contents were evaluated by using Geometrical Index of Importance (GII). In the digestive system contents of C. carpio living in Keban Dam Lake, 53 food items (Bacilariophyta 28 species, Chloropyhta, 3 species, Cyanophyta 2 species, Dinophyta 1 spe- cies, Rotifera. 10 species, C1adocera7 species, Cope- poda 1 species and Diptera 1 species), in Karakaya Dam Lake 40 food items (Bacilariophyta 19 species, Chlopyhta, 1 species, Rotifera 10 species, Cladocera 7 species, Copepoda 2 species and Diptera 1 species) and in Ataturk Dam lake 41 food items (Baci1an- ophyta 17, Chlorophyta 4 species, Rotifera 10 spe- cies, Cladocera 7 species, Copepoda 2 species and Diptera 1 species) have been identified. In these dam lakes species belonging to Bacillariophta were ob- served in every digestion system contents with high number of individuals and species richness. Species from Rotifera were the most recorded animal spe- cies. No empty digestive system content during the study period was observed. The results of Geometric Index of Importance indicated Cyprimzs carpio as omnivorous species.
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