TY JOUR TI SPECIFIC FEATURES OF METAL ACCUMULATION IN THE RUSSIAN (ACIPENSER GUELDENSTAEDTII, BRANDT, 1833) AND PERSIAN (ACIPENSER PERSICUS, BORODIN, 1897) STURGEON OF THE CASPIAN SEA KW specific bioaccumulation KW chemical elements KW Russian sturgeon KW Acipenser gueldenstaedtii (Brandt KW 1833) KW Persian sturgeon KW Acipenser persicus (Borodin KW 1897) KW Caspian Sea JO Fisheries AU Chaplygin, V.. AU Khursanov, A.S. AU Ershova, T.S. AU Zaitsev, V.. PY 2020 IS 2020 PB FSBI "TSUREN"