Feeding of Barbus cyclolepis Heckel, 1837 (Teleostei: Cyprinidae) and its relationship with benthic macroinvertebrate fauna in the Istranca Stream (İstanbul, Turkey)

The aims of the study are to determine what organisms Barbus cyclolepis consume as food in its feeding environments and compare prey consumption with abundance environment. was conducted Istranca Stream located Istanbul (Turkey) during spring summer 2012. A total 142 B. specimens were captured it is determined that 94 them had full digestive tracts. Diet analyses showed spectrum consisted 11 different types, species found feed on insects, mainly Diptera (IRI%= 92.26%). most abundant macroinvertebrate environment Gastropoda. electivity index positive for (E= 0.49), but value below expected 0.6 high selectivity. values other groups, consumed low proportions, negative. In summer, fish fed Diptera, Plecoptera, Trichoptera, a only Trichoptera 0.87). Results did not Gastropoda, although second group relationship between proportion groups tracts ratios macroinvertebrates environment, result, specified selective Diptera.