Tilapya Balığı (Oreochromis niloticus L.) yavrularının balık unu yerine farklı oranlarda soya unu ilave edilen yemlerle beslenmesinin büyüme parametrelerine etkisi

Bu çalışmada, yavru tilapya balıklarında balık unu yerine, yağsız soya unu ile lisin eklenerek hazırlanan rasyonların etkisi araştırılmıştır. Ortalama % 35.8 ham protein ve 2.6 sindirilebilir enerji içeren üç rasyon hazırlanmıştır. 1. rasyon (grup 1; kontrol) rasyondaki proteinin % 25.13 balık unu proteininden gelmektedir. Deneme rasyonları grup 2 ve 3, balık unundan gelen proteinin sırasıyla % 30 ve % 50 si yerine yağsız soya unu proteini gelecek şekilde hazırlanmıştır. Deneme 12 hafta süresince suyun filitre edildiği kapalı dolaşımlı sistemde yürütülmüştür. En yüksek ortalama ağırlık kazancı ve spesifik büyüme oranı 1. rasyon ile beslenen 1. grupta (646,15 % ; 2.39) saptanmıştır (P0,10) önemli değildir. Bütün ölçüm kriterleri dikkate alındığında, balıkların performansı değişmeden balık unundan gelen balık proteininin %50 si yerine rasyona yağsız soya unu ilavesi önerilebilir.

Effect of partially replacing fishmeal with soybean meal on growth parameters of nile tilapia (Oreochromis niloticus L.)

In this study, the effect of replacement of fish meal by defatted soybean meal with the dietary lysine supplementation in prepared diet was investigated in Nile tilapia fingerlings. Three different experimental diets (all containing mean 35.8% crude protein and 2.6 DE) at a various ratios of soybean meal has prepared. Diet 1 (Group 1; Control) Protein from fish meal is 25.13 % of crude protein. Control (grup 1) diets were composed of fish meal completely. Experimental diets group 2 and 3 were composed of 30% and 50% defatted soybean protein respectively instead of fish meal. The experiment was carried out in a closed rearing system with recirculated filtered water for 12 weeks. Highest mean weight gain (MWG) and specific growth rate (SGR) were obtained group 1 fed with diet 1 (646,15 % ; 2.39) and was significantly better than all other levels (PO.10). Optimum feed conversion ratio (FCR) (1.05), protein efficiency ratio (PER) (2,89), average daily growth % (ADG %) (7.71), daily growth index (DGI) (3.90) and feed efficiency (FE) (0.95) (P0.05 statistical significance level. In addition, all parameters except FCR and MWG were not significantly different between group 2 and group 3 (PO.10). Based on all measured criteria, these suggest that 50 % of fish protein from fish meal can totally be replaced by defatted soybean meal without adverse effect on fish performance.

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