evaluation of yarrowia lipolytica lipase 2 on growth performance, digestive enzyme activity and nutritional components of russian sturgeon (acipenser gueldenstaedtii)

The effects of yarrowia lipolytica lipase 2 (yll2) on growth performance, digestive enzyme activity and muscle nutritional components of russian sturgeon (acipenser gueldenstaedtii) 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, with three repetitions. fish fed diets with yll2 at 1.0 g/kg showed the highest growth compared with that of the other groups (p<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 (p<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 (p<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.