Super-intensive farming of white leg shrimp (Litopenaeus vannamei) applying bioflocs technology in Bac Lieu

Abstract

Super-intensive culture of white leg shrimp (L. vannamei) is increasingly important in the Mekong Delta of Vietnam. The study was conducted at Long Manh Company in Bac Lieu province with aims at evaluating the efficiency of super intensive culture of white leg shrimp at commercial scale. Shrimp were cultured with two-phases in HDPE tanks under net houses. Shrimp postlarvae were nursed in four 100-m3 circular tanks at a stocking density of 2500 PL/m3 for the first phase, juvenile was then transferred to the second phase with four 500-m3 tanks at 500 shrimps/m3. Molasses were added daily to the culture tanks at the C/N ratio of 15:1. Culture water was rarely exchanged during culture and salinity was maintained at around 20ppt. Shrimp with initial body weight and length were at 0.03 g and 1 cm, respectively. The results showed that after 90 days of culture, water quality was in suitable ranges for shrimp growth. The daily weight gain and daily length gain of shrimp during 2-phased culture were at 7.27 %/day and 2.88 %/day, respectively. Very high survival rates in nursing and grow-out phases (87% and 83.25%, respectively) and very high shrimp production (0.58kg/m3 and 3009.5 kg/500m3, respectively) were achieved at harvest,.