TY JOUR TI AQUATIC BIOLOGICAL RESOURCES IN THE PENZA REGION, THE SURA RIVER KW Penza region KW Sura river KW river sections KW forage base KW phytoplankton KW zooplankton KW zoobenthos KW fish stocks KW ichthyofauna KW fish productivity JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Asanov, A.. PY 2016 IS PB Astrakhan State Technical University