Abstract: A study was conducted to examine the effects of partially replacing fish meal in the diets with Aspergillus oryzae fermented soybean meal (FSBM) and unfermented soybean meal (USBM) on feed intake and growth of juvenile Turbot (Scophthalmus maximus L.). The soybean meal were inoculated with a single A. oryzae strain and fermented to obtain one FSBM. The amounts of trypsin inhibitor, phytic acid, soyasaponins, stachyose and raffinose in FSBM were lower than those in USBM. Six isonitrogenous and isocaloric diets were formulated in which USBM protein respectively replaced 0% (control), 25%, 40% and 55% FM protein (diet 1-4), FSBM protein respectively replaced 40% and 55% FM protein (diet 5-6). At the end of the feeding trial, the feed intake (FI), specific growth rate (SGR), feed efficiency ratio (FER) and protein efficiency ratio (PER) of the fish fed the diets containing 40% and 55% USBM were significantly lower than those of the control (P<0.01). The FI, SGR, FER and PER of the fish fed 40% FSBM were significantly higher than those of 40% USBM (P<0.01), but not significantly different from the control. The fish fed 55% FSBM also had lower FI and SGR.