Osman Tolga ÖZEL, Eyüp ÇAKMAK, İSA COŞKUN, Ekrem Cem Çankırılıgil

Evaluation of growth performance and intestine villi morphology of black sea trout (Salmo labrax Pallas, 1814) fed with different protein levels containing diets

This study was conducted to determine changes in the growth performance and distal intestine villi morphology of juvenile Black Sea trout (Salmo labrax) fed diets with three different protein levels (40%, 45% and 50%). It was carried out in two separate sections; freshwater (RAS) and seawater. Juvenile Black Sea trout, having average initial weights of 3.44g (freshwater) and 17.70g (seawater), were fed for 90 days. WG, SGR, FCR and survival weren’t affected by dietary treatment. However distal intestine villi length (VL), width (VW) and length to width ratio (VL/VW) were affected by dietary treatments. Villi length, width and length to width ratio in the fish fed with diet containing 50% protein in freshwater were found to be higher than those fed with other diets. Villi length in the fish fed with diet containing 50% protein in seawater was higher than those fed with other diets. Results showed that feeding with diets contained different protein levels did not effect on growth performance of Juvenile Black Sea trout, but affected on distal intestine villi morphology.

Farklı protein düzeyli diyetlerle beslenen karadeniz alabalığı (Salmo labrax Pallas, 1814)’nın büyüme performansı ve bağırsak villi morfolojisinin belirlenmesi

Bu çalışma, üç farklı protein düzeyi (%40, %50 ve %55) içeren diyetlerle beslenen yavru Karadeniz alabalığı (Salmo trutta labrax)’ nın büyüme performansı ve bağırsak villi morfolojisindeki değişimleri belirlemek için yapılmıştır. Çalışma tatlısu (kapalı devre) ve deniz suyu olmak üzere iki ayrı yetiştiricilik şartlarında yürütülmüştür. Başlangıç ağırlıkları 3.44 g (tatlısu) ve 17.70 g (deniz suyu) ortalamalarına sahip yavru Karadeniz alabalıkları 90 gün boyunca beslenmiştir. Ağırlık artışı, spesifik büyüme oranı, yem değerlendirme oranı ve yaşama oranı diyetsel uygulamalardan etkilenmemiş, bağırsak villi uzunluğu (VL), genişliği (VW) ve uzunluğun genişliğe oranı (VL/VW) ise diyetsel uygulamalardan etkilenmiştir. Tatlısuda %50 protein içeren diyetle beslenen balıkların VL, VW ve VL/VW değerleri diğer iki diyetle beslenenlerden daha yüksek bulunmuştur. Deniz suyunda ise %50 protein içeren diyetle beslenen balıkların VL değeri diğer iki diyetle beslenenlerden daha yüksek bulunmuştur. Bu sonuçlar, farklı protein düzeylerinin yavru Karadeniz alabalığının büyüme performansı üzerinde herhangi bir etkiye sahip olmadığı, ancak bağırsak villi morfolojisi üzerine etkiye sahip olduğunu göstermiştir.

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