AbstractCanonical correlation analysis was used to study the influence of management factors on growth and yields in an experimental polyculture system. The major conclusions are: (1) yield of each species was affected mainly by its own stocking density, followed by interactions with other species; (2) the best yields and growth rates of tilapia were obtained with stocking weights of over 13 g and; (3) common carp,Cyprinus carpioL., was affected negatively by silver carp,Hypoihalmichihys molitrix(Valenciennes), density and positively by nutrient inputs. Its best performance was obtained at silver carp density below 1000/ha.Analyses of data from commercial production units are required to confirm these conclusions