TY JOUR TI ECOLOGICAL RISK OF A SAND QUARRY EXCAVATION IN THE RIVERBED KW water area KW wintering hole KW excavation of the quarry KW the Irtysh KW fish population KW fish abundance KW turbidity factor KW hydrobionts KW Siberian sturgeon JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Aldokhin, A.. AU Chemagin, A.. PY 2018 IS PB Astrakhan State Technical University