TY JOUR TI BIODIVERSITY OF OBJECTS OF AQUATIC BIORESOURCES OF THE VOLGA-CASPIAN FISHERY AREA KW the Caspian Sea KW the Volga river KW ecological groups KW species composition KW sea level KW commercial catch KW sturgeons KW herrings KW semi-anadromous and river species of fish KW salmon fishes KW gray mullets KW whitefish (Coregonidae) KW hardy head (Atherinidae) KW Caspian seal KW crawfish JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Mirzoyan, A.. AU Khodorevskaya, R.. PY 2017 IS PB Astrakhan State Technical University