Abstract: Supplying much of the required energy through carbohydrates and/or lipids helps in avoiding protein utilization as an energy source. The present study was carried out to evaluate the effect of fish meal free diets, formulated with high levels of maize and supplemented with sardine oil, on growth, carcass composition and digestive enzyme activity of common carp, Cyprinus carpio when grown under a fertilization regime. Fingerlings of average weight (av. wt.) 2.21-2.24 g stocked at 1 per m2 in mud bottomed tanks (18 m2) were fed daily on one of the four fish meal-free (protein 17.73 to 18.91%, Nitrogen-free Extract (NFE) 40.44 to 47.40%) sardine oil supplemented (0, 3, 6 and 9%) diets in triplicate, over a period of 120 days. Highest weight gain and Specific Growth Rate (SGR) were recorded in fish fed the diet containing 9% added oil. Fish survival varied between 96.29 and 98.14%. Addition of oil resulted in lower (p<0.05) Feed Conversion Ratio (FCR). Carcass protein and fat increased, while ash content decreased in fish fed oil supplemented diets. Protease activity in the intestine as well as hepatopancreas of the treated fish showed a decrease (p<0.05). Amylase activity was high but did not differ among treatments (p>0.05). Increased lipase activity was observed with increasing level of oil addition only in the hepatopancreas. The results of the present study reveal the ability of common carp to perform well with low protein, oil supplemented fish meal free diets, 9% added oil inducing the best growth of fish when grown in fertilized tanks.