CHẤT LƯỢNG NƯỚC VÀ TĂNG TRƯỞNG TÔM THẺ CHÂN TRẮNG (Litopenaeus vannamei) NUÔI TRONG HỆ THỐNG TUẦN HOÀN NƯỚC QUI MÔ SẢN XUẤT

Abstract

The aims of this study are to evaluate water quality and growth performance of whiteleg shrimp (L. vannamei) cultured in recirculating aquaculture systems (RAS) at commercial scale. The culturing period was divided in three different phases in which each culturing phase was prolonged for 30 days (the first phase: day 1 - 30, the second phase: day 31 - 60 and the third phase: day 61 - 90). The components of the RAS comprised a grow-out pond, a drum-filter, a biofilter reactor and a recirculating pump. The results showed that 14 parameters of water quality were optimal for growth of shrimp with low water exchange during culture period. Growth rates of the shrimp cultured of first phase, second phase and third phase were 0.1g/day, 0.4g/day, 0.4g/day, respectively. The survival of shrimp cultured of first phase, second phase and third phase  showed  95.4%, 89.7% and 84.4%, respectively. Feed conversion ratio of first phase, second phase and third phase showed 1.0, 0.9 and 1.1, respectively. Therefore, the RAS technologies could be considered as suitable system for whiteleg shrimp culture in Viet Nam at commercial scale.