TY JOUR TI Biogeochemical monitoring of composition of chemical elements in Caspian Sea KW heavy metals KW biogeochemical monitoring KW Caspian Sea KW crustaceans KW mollusks KW fish KW Caspian seal JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Nevalennyy, A.. AU Ershova, T.. AU Zaitsev, V.. AU Chaplygin, V.. PY 2022 IS PB Astrakhan State Technical University