Grass carp fed a fishmeal-free extruded diet showed higher weight gain and nutrient utilization than those fed a pelleted diet at various feeding rates

The present study was conducted to investigate the effects of extruded and pelleted feeds at various feeding rates on growth and nutrient utilization of grass carp (Ctenopharyngodon idellus). Two fish meal-free feeds with the same formula were prepared as pelleted feed and extruded feed, and fed to eight treatments of fish (37.0 ± 0.2 g) with feeding rates of 100%, 90%, 80% and 70% satiation. During the feeding period, the fish of 100% satiation...