This study investigated the effect of a lotic environment on morphological characteristics and energy metabolism in juvenile grass carp Ctenopharyngodon idella. The fish were stocked forced to swim for 12 h per day 4 weeks at three water current velocities 0.5, 2, body length s−1 (Bl s−1). control lentic with 0 Bl s−1. results showed that significantly increased weight, length, condition factor...