REPRODUCTIVE BIOLOGY AND HISTOLOGICAL CHANGES IN THE GONADS OF BARB, Capoeta trutta (HECKEL, 1843) IN ATATÜRK DAM LAKE, TURKEY

Year 2008, Volume: 23 Issue: 2, 1 - 11, 13.12.2009

Seyit Oymak , Davut Musa Erhan Ünlü

Abstract

In this study, it was aimed at investigating the reproductive biology and histologically determining the developmental stages of oocytes of Capoeta trutta (Heckel, 1843) in Atatürk Dam Reservoir. Te sex ratio was calculated as 1: 1.03 F/M (total n=422). It was determined that the mean length of the specimens considered sexually mature for both sexes was 200 mm. The gonado-somatic index (GSI) values peaked in May. The gonads obtained from males and females presented three and six development stages, respectively. The egg diameters were between 0.42 and 1.69 mm. The results indicated that the spawning activity observed in males and females, at 3 years of age or more, seems to be in May and June. The microscopic appearance of the gonads shows similar characteristics to other teleost species.  

Keywords

Capoeta trutta, Gonadosomatic index, Fecundity, Gonad histology, Atatürk Dam Lake

ATATÜR K BARAJ GÖLÜ'ND E YAŞAYA N KARABALIKLARI N Capoeta trutta (HECKEL, 1843) ÜREME BİYOLOJİS VE GONADLARINDAKİ HİSTOLOJİK DEĞİŞİMLER

Abstract

Bu çalışmada, Atatürk Baraj Gölü'nde yaşayan Capoeta trutta'nın üreme biyolojisi ve gonad değişimlerinin histolojisi incelenmiştir. Populasyonun Dişi/Erkek oranı 1:1,03 olarak belirlenmiştir (n=422). Eşeysel olgunluğa ulaşmış bireylerin ortalama boy uzunluğu dişi ve erkek bireyler için 199 ± 11.15 mm olarak tespit edilmiştir. GSI değerinin Mayıs ayında en yüksek düzeye ulaştığı belirlenmiştir. Gonadların olgunlaşma safhaları mikroskopik olarak erkek bireyler için üç, dişi bireyler için altı safha olarak değerlendirilmiştir. Yumurta çapları 0,42-1,69 arasında bulunmuştur. Çalışma sonuçlarına göre, 3 ve daha yaşlı dişi ve erkek bireyler için üreme zamanı Mayıs-Haziran ayları olduğu tespit edilmiştir. Her iki eşey için gonadların mikroskopik özellikleri diğer kemikli balıklarla benzerlik göstermektedir.

Keywords

Capoeta trutta, Gonadosomatik indeks, Fekundite, Gonad histolojisi, Atatürk Baraj Gölü

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