This research aimed to study the effect of adding different rates of lysine on the weight and growth of common carp fingerlings. The experiment was carried out in the laboratory for 4 months using eight glass containers (40 liters each) with four treatments (L0 no Lysine addition, L1 (2%), L2 (3%), L3(4%) of the total weight of diet. Eight common carp fingerlings (average of tall 7.5cm ± 0.05 and average of weight 12.25g ± 0.57) were cultured in each container with Oxygen pumps and filters. Results showed by growth rate, absolute growth rate, specific growth rate and food conversion ratio (FCR) that the treatment L1 (2% lysine) was significantly the best comparing to the other treatments, where FCR was (2.2) and the specific growth ratio was (0.28 %)