This study was conducted to find out the effect of adding different levels of Jerusalem Artichoke Tubers (Helianthus tuberosus L.) (JAT) powder and Sprout Germinated Barley (SGB) powder to common carp diets (Cyprinus carpio L.) on the rates parameters of Apparent Digestible Coefficient (ADC%) and Apparent Protein Digestible (APD%). 147 fish were distributed to seven treatments, 7 fish in each aquarium with three replications per treatment, for a period of 70 days. It was fed with 3% of weight of the biomass and was given twice a day. The (JAT) powder was added at the rate of 2.5, 5 and 7.5 g/kg, for the first, second, and third treatments respectively, add (SGB) powder 2.5, 5 and 7.5 g/kg for the fourth, fifth and sixth treatments respectively. ADC% Rate, third treatment which was 7.5 g/kg of JAT significantly P≤0.05 outperformed, for ADC (69.915%) on all treatments, It did not differ did not differ significantly P≤0.05 with both the fifth treatment (5 g/kg SGB) and the sixth one (7.5 g/kg SGB), They recorded 69.090% and 69.715%  respectively. APD% Rate: The second treatment (5 g/kg SGB) and the third treatments (7.5 g/kg SGB) it recorded (79.215%) (79.650%) respectively, significantly P≤0.05 outperformed for the APD on all treatments.  It did not differ significantly P≤0.05 with the fifth treatment (5 g/kg SGB) and sixth (7.5 g/kg SGB) and recorded 75.985% and 76.945% respectively.

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