Hülya ŞEREFLİŞAN, Fırat Sertaç TELLİOĞLU

Effects of Size Grading and Different Stocking Size Compositions on Growth Performance of Hybrid Tilapia (Oreochromis niloticus♀ X Oreochromis aureus♂) Juvenile

In aquaculture, size grading application is made in order to protect against the disadvantages caused by the length difference between fish. Via this activity, large and small individuals separate each other during the feeding period. In this study designed for this purpose, it was aimed to determine whether the large individuals added to theherd had an effect on the growth performance of small individuals in the culture of Oreochromis niloticus♀ x Oreochromis aureus♂ hybrids. In the experiment, 0 age 1-4 g hybrid juvenile which just complete the juvenile period were stocked as 40 fish / m³ in 500 l fibre tanks placed in a greenhouse and cultured for 75 days. The experimental groups were designed as a graded group (G1) containing 1 g small individual, 1 g + 2 g (G2), 1 g +3 g (G3) and 1 g + 4 g (G4). At the end of the study, it was observed that grading did not positively effect on the growth of tilapia hybrids. In contrast, it was revealed that small individuals (18,60 ± 0,33g) in the G2 group, which included large individuals, grew better than small individuals in the other groups. However, the G2 group reached a better FCR (1.39 ± 0.05) than the other groups. The best economic conversion rate was again achieved in the G2 group (11.12 ± 0.75). As a result, it was observed that the culture practice with individuals of different sizes had a positive effect on the development of hybrid tilapia juvenile, especially when juvenile were stocked as 1+2g stocking composition, as a result of well competition can be established and this situation had a positive effect on the production cost.

Boylamanın ve Farklı Boy Kompozisyonlarında yetiştirilmesinin Melez Tilapia (Oreochromis niloticus ♀ X Oreochromis aureus♂) Yavrularının Büyüme Performansları Üzerine etkisi

Su ürünleri yetiştiriciliğinde boylama uygulaması balıklar arasında oluşan boy farkının yarattığı dezavantajlardan korunmak amacıyla yapılır. Bu etkinlikle büyük ve küçük bireyler besleme periyodu sırasında birbirlerinden ayrılırlar. Bu amaçla kurgulanan bu araştırmada Oreochromis niloticus♀ xOreochromis aureus♂ melezlerinin yetiştiriciliğinde küçük bireylerin büyüme ve besi performansları üzerine sürüye eklenen büyük bireylerin etkilerinin olup olmadığının belirlenmesi amaçlanmıştır. Denemede 0 yaş 1 ile 4 g’lık melez yavrular fiber tanklara 40 adet/m3oranında stoklanmış ve 75 gün boyunca yetiştirilmiştir. Deneme grupları, tamamı 1 g’lık küçük bireylerden oluşan boylanmış bir grup (G1), 1 g ve 2g’dan oluşan (G2), 1 g ve 3g’dan oluşan (G3) ve 1 g ve 4g’dan oluşan (G4) grubundan oluşmuştur. Çalışma sonunda boylamanın tilapia melezlerinin büyümesine pozitif etki etmediği görülmüştür. Buna karşı içinde büyük bireylerin bulunduğu G2 grubundaki küçük bireylerin (18,60±0,33g) diğer gruplardaki küçük bireylerden daha iyi büyüdüğü ortaya çıkmıştır. Bununla birlikte G2 grubu diğer gruplardan daha iyi bir (1,39±0,05) YDO’naulaşmıştır. En iyi ekonomik dönüşüm oranı yine G2 grubunda (11,12±0,75)elde edilmiştir. Sonuç olarak farklı boydaki bireylerle yapılan yetiştiricilik uygulamasının melez tilapia yavrularının gelişimine pozitif etki yarattığı, özellikle 1+2 g şeklinde stoklandıklarında rekabet ortamının geliştiği ve bu durumun yetiştiricilik ekonomisine olumlu yönde etki ettiği gözlemlenmiştir.

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