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¹ Fırat University, Fisheries Faculty, 23119, Elazığ, Turkey
² Fırat University, Faculty of Arts and Sciences, Department of Biology, 23119, Elazığ, Turkey DOI : 10.4194/trjfas.2010.0211 Viewed : 4032 - Downloaded : 2799 In this study, digestive system contents of a total of 126 Mastacembelus mastacembelus (Banks & Solander, 1794) obtained from Karakaya Dam Lake were examined by means of Geometric Index of Importance (GII). In the digestive system content of examined fish, Bacillariophyta (16 taxa), Chlorophyta (6 taxa), Cyanophyta (5 taxa), Dinophyta (1 taxon) and Euglenophyta (1 taxon) which belong to plants and Rotifera (14 taxa), Cladocera (4 taxa), Copepoda (2 taxa) and Pisces (3 taxa) which belong to animals have been found. The percentage of organisms in the all organisms were determined respectively as Bacillariophyta (32.79%), Rotifera (29.83%), Cyanophyta (16.20%), Chlorophyta (14.36%), Cladocera (3.40%), Copepoda (2.69%), Euglenophyta (0.61%), Pisces (0.09%) and Dinophyta (0.03%). Keywords : Mastacembelus mastacembelus, digestive system, stomach contents, Karakaya Dam Lake