VOLKAN KIZAK, Yusuf GÜNER, Murat TÜREL, Murathan KAYIM

Comparison of growth performance, gonadal structure and erythrocyte size in triploid and diploid brown trout (Salmo trutta fario L, 1758)

Bu çalışmada, triploit ve diploit dere alabalıklarının (Salmo trutta fario) gelişimleri, gonat yapıları ve eritrosit büyüklükleri karşılaştırılmıştır. Döllenmiş yumurtlara sıcaklık şoku uygulamasıyla triploidizasyon yapılmıştır. Döllenmeden sonraki 18.aydan itibaren 32.aya kadar triploid (TBT) ve diploit (CBT) dere alabalığı grupları incelenmiştir. Her iki deneme grubunda yaşama oranı, spesifik büyüme oranı, yem dönüşüm oranı, kondisyon faktörü, nisbi ve mutlak büyüme oranı, gonadosomatik indeks, hepatosomatik indeks ve karkas verimi saptanmıştır. Triploit balıklar istatiksel olarak önemli olmasa da diploit balıklara göre daha fazla gelişim göstermiştir (P>0,05). Triploit grubunda triploidizasyon başarısı %95 olup erkek/dişi oranı %44,4-55,6 olarak bulunmuştur. Kırmızı kan hücreleri triploitlerde diploitlere göre önemli derecede büyüktür (P

Triploit ve diploit dere alabalıklarında (Salmo trutta fario L, 1758) büyüme performansı, gonat yapısı ve eritrosit boyutunun karşılaştırılması

The aim of this study was to compare growth, gonadal structure and red blood cell sizes of triploid and diploid brown th trout (Salmo trutta fario). Triploidy was induced by providing a heat shock treatment to the fertilized eggs. From the 18month post-fertilization triploid (TBT) and control diploid (CBT) brown trout groups were investigated up to 32 nd month. Survival, specific growth rate, feed conversion ratio, condition factor, relative growth rate, absolute growth rate, gonadosomatic index, hepatosomatic index and carcass yield were determined in both groups. It has been determined that the triploid fish showed greater live weight than diploid fish despite the difference was not significant (P>0.05). In triploid group triploidisation success was obtained as 95% and male/female ratio was found as 44.4-55.6%. The red blood cells were significantly larger in triploids than diploid ones (P<0.05). Regarding histological section of gonads, triploidy resulted in reduced gonadal development in female, while triploid males seem to exhibit normal gonadal development. Our results suggest that since triploid females could grow more than males, the growth performance studies on triploid brown trout should be performed with all-female stocks under fish farming practices especially for the production of large size trout.

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