Triplicate groups of M. rosenbergii (3 tanks, 1000 individuals per tank, an average initial body weight (BW, 1.070.11 g)) were fed with the basal diet (see Table 1) and the basal diet supplied with 0.05%, 0.1%, 0.2% and 0.4% of Anthraquinone extract from R. officinale Bail, respectively