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¹ Su Ürünleri Fakültesi, Çukurova Üniversitesi, Adana, Türkiye
² Feke Meslek Yüksekokulu, Çukurova Üniversitesi, Adana, Türkiye DOI : 10.17693/yunusae.v2014i21954.235731 Viewed : 3732 - Downloaded : 2147 In this study, effects of first stocking size and size grading on growth of nile tilapia and their hybrids (Oreochromis niloticus female x Oreochromis aureus male) were investigated. Adecision has been made on which stocking system has been more effective on which size grading of stocking, starting the stocking with different size grading compositions. In another dimension of the study; it's been researched that in what amount would this situation effects when individual with variable weights are placed randomly compared to placements with either only small or large. At the end of the research hybrids were higher growth value than nile tilapia. Furthermore, mixed groups either hybrids, or nile tilapia groups were made better growth rate and FCR than the other groups (graded groups). Keywords : Nile Tilapia, Hybrid tilapia, Size grading, First stocking size