TY JOUR TI INFLUENCE OF FOOD PRESENCE IN THE ZONE OF TEMPERATURE OPTIMUM UPON BEHAVIOR OF YOUNG PERCHPERCA FLUVIATILIS L KW preferred temperature KW thermoregulatory behavior KW feeding behavior JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Smirnov, A.. PY 2013 IS 2013 PB Astrakhan State Technical University