In this study, the effecs of centary oil (Hypericum perforatum) on growth performance and some blood parameters of fry common carp (Cyprinus carpio) were evaluated. For this purpose, 3 different experimental diets containing rate of 0 g/kg (SKY0), 5 g/kg (SKY5) and 10 g/kg (SKY10) centaury oil were prepared. The study consisted of 3 repetitions for each group with 3.07±0.02 g fry and in 40 L plastic tanks as 30 fish per aquarium for 60 days.