Macroscopic and Microscopic Examination of Seasonal Gonad Change in Alburnus istanbulensis Battalgil 1941 Teleostei Cyprinidae

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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 were collected from Darlık Dam, were examined during December 2011-December 2012.The highest GSI values were 13.07±1.63for 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.