TY JOUR TI BIOLOGICAL CHARACTERISTICS OF SIRES AND REARING JUVENILS OF PIKEPERCH STOCKED UP FOR REPRODUCTION IN THE KAPCHAGAI WATER RESERVOIR KW pikeperch KW sires KW periods of spawning KW age KW size indexes KW statistical authenticity of differences JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Isbekov, K.. AU Koyshibaeva, S.. AU Fedorov, E.. PY 2017 IS PB Astrakhan State Technical University