Ezgi HAMZAOĞLU, MÜFİT ÖZULUĞ, Yasemin TUNALI, Melike ERKAN

Macroscopic and Microscopic Examination of Seasonal Gonad Change in Alburnus istanbulensis(Battalgil, 1941) (Teleostei:Cyprinidae)

Alburnus istanbulensis (Battalgil, 1941) Marmara Bölgesi'nin kuzey kesimlerindeki kıyısal akarsularda bulunan ekonomik açıdan değerli endemik bir türdür. Aralık 2011-Aralık 2012 sürecinde Darlık Barajı'ndan toplanan 317 birey incelenmiştir. En yüksek GSI değerleri, Haziran ayının başında, dişilerde 13.07±1.63 erkeklerde ise 6.95±1.28 olarak görülmüştür. En düşük GSI değeri dişilerde Ağustos ayında (1±0.33) görülürken, erkeklerde ise Eylül ayında (1.05±0.21) gözlenmiştir. Histolojik bulgular, makroskopik gözlemler ve GSI değerleri ile karşılaştırılarak dişilerde beş erkeklerde dört gelişim evresi saptanmıştır. Bu bulgular A.istanbulensis'in Haziran ayında yumurta döktüğünü ortaya çıkarmıştır

Alburnus istanbulensis(Battalgil, 1941) (Teleostei:Cyprinidae)'in Mevsimsel Gonad Değişiminin Makroskopik ve Mikroskopik Incelenmesi

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

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