TY JOUR TI DISTRIBUTION OF CASPIAN SPRATS IN THE NORTH-WESTERN PART OF THE CASPIAN SEA (BASED ON RESULTS OF HYDROACOUSTIC RESEARCH IN NOVEMBER 2018) KW hydroacoustic studies KW Middle Caspian KW north-western part of the Caspian Sea KW sprat schools density KW echogram KW echoregistration KW echo intensity JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Pomogaeva, T.. PY 2019 IS PB Astrakhan State Technical University