Effects of dietary protein level on growth performance, nitrogen and energy budget of juvenile hybrid sturgeon, Acipenser baerii ♀×A. gueldenstaedtii ♂

An 8-week growth trial was conducted to estimate the optimal dietary protein level for juvenile hybrid sturgeon, Acipenser baerii ♀ × A. gueldenstaedtii♂ (initial body weight, 25.1 ± 0.12 g). Effects of protein levels on nitrogen and energy budget of the fish were studied. Seven isoenergetic diets were formulated to contain seven levels of crude protein (250, 300, 350, 400, 450, 500 and 550 g kg− 1) and each diet was fed to triplicate groups of...