TY JOUR TI ECONOMIC EFFICIENCY OF BREEDING TWO-YEAR-OLD AND THREE-YEAR-OLD RUSSIAN STURGEON IN CONDITIONS OF SOUTHERN KAZAKHSTAN KW sturgeon breeding KW Russian sturgeon KW two-year-old KW three-year-old KW breeding in ponds KW breeding in basins KW economic efficiency KW commercial cost JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Fedorov, E.. AU Badryzlova, N.. AU Didenko, T.. AU Akhmetova, G.. PY 2015 IS 2015 PB Astrakhan State Technical University