effects of dietary replacement of fish oil with canola oil in the diet of juvenile common carp, cyprinus carpio on growth performance and feeding utilization of body and diet economic index

this study was designed to determine the effects of dietary replacement of fish oil with canola oil ongrowth performance, feed efficiency of body and economic indices of experimental diets of juvenilecommon carp (cyprinus carpio). during the experiment 270 juvenile fish with an average initialweight of 16.24 ± 0.10g were randomly distributed in 18 well aerated cylindrical polyethylene tanks(15 fish per 300l capacity tank). experimental fish were fed with six isonitrogenous (crude proteincontent 30.02 percent), isolipidic (crude lipid content 8.77 percent) and isoenergetic (1.184 mj/kg )diets consisting of six levels of dietary replacement of fish oil (fo) with canola oil (co) (100fo,80fo20co, 60fo40co, 40fo60co, 20fo80co and 100 co), for 56 days. one-way anovashowed no significant difference (p>0.05), in growth performance, feed efficiency parameters,hepatosomatic index (hsi), cardiosomatic index, condition factor and economic index between theexperimental treatments. however, anova showed a significant difference in survival rates, net lipidutilization (nlu) and the viscerosomatic index (vsi) (p