Abstract
This study purpose was to find out the suitable light intensity range for Biofloc formation, survival rate and growth rate for nursing of white leg shrimp (Litopenaeus vannamei) postlarvae. The experiment included 3 treatments of different light intensities of (1) not cover shading net (control treatment), (2) cover with 1 layer of shading net, (3) cover with 3 layers of shading net. Composite tanks of 500 L containing 250 L of brackish water (15ppt) were used. White leg shrimp (PL15) were stocked at 2000 inds/m3 with the weight of 0.03 g/PL15 in strong aeration. Wheat flour and soya bean meal were used at C/N ratio of 15:1. After 6 weeks of experiment, nursing of white leg shirmp in Biofloc system with different light intensities showed strong effects on biofloc formation, growth performances and survival of shrimp. Particularly, total length and weight of shrimp were highest in the treatment 2 (5.35 cm and 1.4 g, respectively) and lowest in the control treatment (4.5 cm and 0.85g). In addition, the highest survival rate (58.07 %) and highest yield (1,161 shrimp/m3)was also found in the treatment 2. The results shown that treatment cover with 1 net layer with appropriate light intensity of 43-308 Lux gave the best results in water quality parameters, growth and survival of shrimp.
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