TY JOUR TI CHARACTERISTIC OF HARD TO IDENTIFY GENUS ACIPENSER SPECIES IN THE IRTYSH RIVER KW sterlet KW Acipenser ruthenus KW the Irtysh river KW shape of bone plates KW hybrid KW meristic signs JO Vestnik of Astrakhan State Technical University AU Aldokhin, A.. AU Volosnikov, G.. PY 2018 IS 2018 PB Astrakhan State Technical University