%0 Journal Article %T OPTIMIZATION OF STAGES OF PRE-SPAWNING AND SPAWNING PERIODS OF TILAPIA IN COMMERCIAL GROWING %A Vasil'eva, E.G. %A Melnik, I.V. %K aquaculture, tilapia, optimization, spawning, feeding, producers, pH %J Vestnik of Astrakhan State Technical University. Series: Fishing industry %D 2021 %N %P 6 %I Astrakhan State Technical University