Studies on the interaction between dietary L-carnitine supplements and dietary lipid or energy levels are scarce. A 12-week feeding trial was undertaken to examine four L-carnitine levels (0, 300, 600 and 900 mg kg diet) and two levels of lipid (50 and 100 g kg diet) on the growth performance, feed utilization, carcass 11 and proximate composition of Common carp, Cyprinus carpio fingerlings in 2×4 factorial experiment. Additionally, eight isonitrogenous (300 g protein kg diet)) and isocaloric (19 MJ gross energy kg ) diets were 11 formulated. Fingerlings averaging 12.36±0.45 g were randomly distributed into 24 glass aquaria (160 liters) and each aquarium holding 25 fish was then randomly assigned to one of three replicates of the eight diets. At the end of the growth study, the carcass and the proximate analysis were withdrawn. It was found that the dietary L-carnitinesupplementation at all levels (300, 600 and 900 mg kg ) significantly (P