TY JOUR TI LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER KW riverbed depression KW water area KW temporarily limited biotope KW fish aggregations KW Acipenseridae KW Cyprinidae KW Perca KW pikes KW Coregonids JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Chemagin, A.. PY 2020 IS 2020 PB Astrakhan State Technical University