In addition to the endocrine factors, fish growth is a multifactorial process influenced by nutritional, genetic and environmental factors. AA stimulate protein synthesis mainly activating the TOR nutrientsensitive signaling pathway (Meijer, 2003; Kim and Guan, 2011). Indirect activation of TOR can also be achieved through the AKT pathway induced by insulin and growth factors (Vander Haar et al., 2007).