TY JOUR TI ANNUAL VARIABILITY OF ACIPENSER RUTHENUS MARSIGLII PARASITES IN LOWER RICHES OF IRTYSH RIVER KW parasitofauna KW Acipenser ruthenus marsiglii KW sturgeon species KW the Lower Irtysh KW Trypanoplasma acipenseris KW Haemogregarina acipenseris KW Acrolichanus auriculatum KW Capillospirura ovotrichuria JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Voropaeva, E.. AU Liberman, E.. PY 2020 IS PB Astrakhan State Technical University