TY JOUR TI ECOLOGICAL FEATURES OF LIGULE INVASION OF BREAM AND ROACH IN THE VOLGA-CASPIAN REGION KW Volga-Caspian region KW young bream and roach KW ligule invasion KW pathogenicity KW ecological features of invasion development JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Chepurnaya, A.. AU Konkova, A.. PY 2012 IS 2012 PB Astrakhan State Technical University