TY JOUR TI BIOLOGICALLY ACTIVE ADDITIVES IN PRODUCTIVE STURGEON DIETS KW sturgeon KW recircular system KW feeding of fishes KW probiotic KW selenium JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Metallov, G.. AU Levina, O.. AU Grigoriev, V.A. AU Kovaleva, A.. PY 2013 IS 2013 PB Astrakhan State Technical University