Research Article: Evaluation of Yarrowia lipolytica lipase ۲ on growth performance, digestive enzyme activity and nutritional components of Russian sturgeon (Acipenser gueldenstaedtii)

The effects of Yarrowia lipolytica lipase ۲ (YLL۲) on growth performance, digestive enzyme activity and muscle nutritional components of Russian sturgeon (Acipenser gueldenstaedtii) were evaluated in a ۵۶-day feeding experiment. Four experimental groups of fish with mean weight of ۴.۴۶۵ g were used in the study: Control group (۰-control), Group ۱ (۱.۰ g/kg YLL۲), Group ۲ (۱.۵ g/kg YLL۲) and Group ۳ (۲.۰ g/kg YLL۲), respectively, with three repetitions. Fish fed diets with YLL۲ at ۱.۰ g/kg showed the highest growth compared with that of the other groups (p<۰.۰۵). For nutrient apparent, docosahexenoic acid (DHA) and eicosapentenoic acid (EPA) concentrations in fish muscle of group which fed with ۱.۰ g/kg YLL۲ increased ۵.۰۵% and ۷.۴۵% respectively, compared with that of control group (p<۰.۰۵). Considering the digestive enzyme activity, lipase and protease activity in liver, spleen and intestine of G۱ fish was also significantly enhanced compared with that of control group (p<۰.۰۵). While, significant increase of amylase activity in intestine was only observed in fish treated with ۲.۰ g/kg YLL۲. The present results suggested that YLL۲ (۱.۰ g/kg) could be used as potential diet additives for aquaculture Russian sturgeon.

Keywords:

Yarrowia lipolytica lipase , Sturgeon , Nutritional components , Growth performance , Digestibility