TY JOUR TI About the possibility of exploitation of the western subsurface ilmen of the Astrakhan region for the development of aquaculture KW aquaculture KW western sub-steppe ilmen KW Astrakhan region KW productivity KW feed base KW monitoring KW herbivorous fish KW trophic level KW water content level KW phytoplankton KW zooplankton KW benthos JO Fisheries AU Pyatikopova, O.V. AU Bedritskaya, I.N. AU Evgrafova, E.M. AU Tangatarova, R.R. AU Ankesheva, B.. PY 2021 IS 2021 PB FSBI "TSUREN"