the objective of this study was to evaluate the influence of two levels of digestible energy (3250 and 3500 kcal kg-1) in conjunction with three levels of crude protein (25, 30 and 35%) on the productive performance of catfish (rhamdia voulezi) juveniles. two-hundred and forty catfish juveniles with 95.55±6.70 g average weight and 20.43±1.13 cm total length were randomly assigned into twenty-four 370 l-cages, in a factorial arrangement with six treatments and four reptitions. feeding was performed four times a day, ad libitum. at end of experimental period, the factorial analysis of variance showed significant influence with respect to the different parameters evaluated. the fish fed with diets of 30% crude protein and 3,250 kcal digestible energy kg-1 of diet presented the best results. therefore, diets with at least 30% crude protein and 3,250 kcal digestible energy kg-1 are recommend for catfish juveniles.