TY JOUR TI Changes in phytoplankton development in Middle Caspian in 2021 KW phytoplankton KW the Middle Caspian KW diatoms KW saprobity KW abundance KW biomass JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Zimina T, a.. AU Ardabyeva, A.. AU Kotelnikov, A.. PY 2022 IS PB Astrakhan State Technical University