TY JOUR TI COMPARATIVE CHARACTERISTICS OF THE VOLGA-AKHTUBA WATERSHED HYDROBIOCENOSES ACCORDING TO INDICATORS OF BIODIVERSITY AND SAPROBITY KW biodiversity KW abundancy KW biomass KW zoocenosis KW biodivercity indices KW zooplankton KW saprobity JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Znobishchev, A.. AU Biryukova, M.. AU Karapun, M.. AU Yurchenko, V.. PY 2017 IS 2017 PB Astrakhan State Technical University