TY JOUR TI PARASITIC DANGER OF LOWER AND MIDDLE OB CARP FISH AS OBJECTS OF FISHING IN 2016 KW contamination of fish KW opisthorchids KW Ob river KW freezing JO Science and education: new time AU Osipov, A.S. AU Smolin, V.V. AU Smolina, N.V. PY 2018 IS 1 PB Non-state educational private institution of additional professional education "Expert-methodological centre"