TY JOUR TI COEFFICIENTS OF ACCUMULATING CHEMICAL ELEMENTS IN ORGANS AND TISSUES OF RUSSIAN (ACIPENSER GUELDENSTAEDTII, BRANDT, 1833) AND PERSIAN (ACIPENSER PERSICUS, BORODIN, 1897) STURGEONS OF CASPIAN SEA KW accumulation factors KW chemical element KW gills KW muscles KW kidneys KW liver KW Acipenser gueldenstaedtii KW Acipenser persicus KW Caspian Sea JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Chaplygin, V.. AU Hursanow, A.. AU Ershova, T.. AU Zaitsev, V.. PY 2021 IS PB Astrakhan State Technical University