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¹ Istanbul University, Faculty of Science, Department of Biology, Division of Zoology, Vezneciler, Istanbul Turkey
² Istanbul University, Faculty of Science, Department of Biology, Division of Hydrobiology, Vezneciler, Istanbul Turkey DOI : 10.4194/1303-2712-v15_3_08 Viewed : 4279 - Downloaded : 5697 Alburnus istanbulensis (Battalgil, 1941) is a commercially valuable endemic species which exists in the coastal streams of Marmara Region’s northern sectors. 317 individuals, which have been collected from Darlık Dam, were examined during December 2011- December 2012. The highest GSI values were 13.07±1.63 for females and 6.95±1.28 for males in the beginning of June. The lowest GSI values were observed in August for females (1±0.33) and in September for males (1.05±0.21). By comparing the histological findings with macroscopic observations and GSI values, five developmental stages were determined for females, four developmental stages for males. These findings revealed that A. istanbulensis spawn in June. Keywords : Alburnus istanbulensis, spermatogenesis, oogenesis, fish reproduction