en aquaculture aquaculture پژوهشي Orginal research papers The effects of <em>Yarrowia lipolytica</em> lipase 2 (YLL2) on growth performance, digestive enzyme activity and muscle nutritional components of Russian sturgeon (<em>Acipenser gueldenstaedtii</em>) were evaluated in a 56-day feeding experiment. Four experimental groups of fish with mean weight of 4.465 g were used in the study: Control group (0-control), Group 1 (1.0 g/kg YLL2), Group 2 (1.5 g/kg YLL2) and Group 3 (2.0 g/kg YLL2), respectively, <a name="_Hlk28254138">with three repetitions</a>. Fish fed diets with YLL2 at 1.0 g/kg showed the highest growth compared with that of the other groups (<em>p</em><0.05). For nutrient apparent, docosahexenoic acid (DHA) and eicosapentenoic acid (EPA) concentrations in fish muscle of group which fed with 1.0 g/kg YLL2 increased 5.05% and 7.45% respectively, compared with that of control group (<em>p</em><0.05). Considering the digestive enzyme activity, lipase and protease activity in liver, spleen and intestine of G1 fish was also significantly enhanced compared with that of control group (<em>p</em><0.05). While, significant increase of amylase activity in intestine was only observed in fish treated with 2.0 g/kg YLL2. The present results suggested that YLL2 (1.0 g/kg) could be used as potential diet additives for aquaculture Russian sturgeon. Yarrowia lipolytica lipase, Sturgeon, Nutritional components, Growth performance, Digestibility 396 409 http://jifro.ir/browse.php?a_code=A-10-3384-1&slc_lang=en&sid=1 W.Q. Chen 1960043743@qq.com 100319475328460039276 100319475328460039276 No Zhejiang Sci-Tech univrsity C.C. Zheng 1365599838@qq.com 100319475328460039277 100319475328460039277 No Zhejiang Sci-Tech univrsity Z.H. Jin 1147662321@qq.com 100319475328460039278 100319475328460039278 No Zhejiang Sci-Tech univrsity Z. Ye 914819839@qq.com 100319475328460039279 100319475328460039279 No Zhejiang Sci-Tech univrsity J.W. Wu 504056815@qq.com 100319475328460039280 100319475328460039280 No Zhejiang Sci-Tech univrsity S.Q. Qian shichao-qian@bpt-biotech.com 100319475328460039281 100319475328460039281 No Hangzhou Biopeptide Biotech Co., Ltd Z.J. Wu Jack-wu@bpt-biotech.com 100319475328460039282 100319475328460039282 No Hangzhou Biopeptide Biotech Co., Ltd C. Sun michael_sc@sina.com 100319475328460039283 100319475328460039283 No Zhejiang Sci-Tech univrsity Y. Sun sunyuqiang@zstu.edu.cn 100319475328460039284 100319475328460039284 No Zhejiang Sci-Tech univrsity H. Fei feihui@zju.edu.cn 100319475328460039285 100319475328460039285 Yes Zhejiang Sci-Tech univrsity