The dietary supplementation of extracted oils from lemon (Citrus limon) (LEO) and/or sweet orange (Citrus sinensis) (OEO) peels in fish culture is initiated to be a potential factor for achieving welfare in Nile tilapia and improving growth performance. The results revealed that the extracted oils treated groups showed a marked increase in the following behavioural patterns such as feeding behaviour and swimming behaviour compared with chemically synthesized zinc oxide nanoparticles (ZnONPs) and control groups. While surfacing, body care, resting and aggressive behaviours with all their patterns were the lowest in the extracted oils treated groups than the other groups. Crossing test showed that fish raised at the extracted oils treated groups were more active and could had the highest values of growth rate than those raised at ZnONPs groups. It was concluded that the addition of extracted oils from lemon and/ or sweet orange peels on basal diet enhanced the optimal Nile tilapia fingerlings’ behaviour and improved their growth rate. Thus, the usage of extracted oils as a feed additive is very essential to increase growth performance and achieve welfare of Nile tilapia fingerlings.