Effect of stocking densities on survival rate and growth performance of white leg shrimp (Litopenaeus vannamei) following bio-floc technology
Abstract
This study aimed to investigate the effects of stocking densities on survival rate and growth performance of white leg shrimp postlarvae (PL) following application of bio-floc technology. The experiment included five treatments at different stocking densities as follow: (i) 500 PL/m³, (ii) 1.000 PL/m³, (iii) 2.000 PL/m³, (iv) 3.000 PL/m³ and (v) 4.000 PL/m³. Postlarvae with initial weight (0.03g) were stocked in composite tanks (0.5 m3) at salinity of 15 ‰. The experiment was lasted for 28 days. Two sources of carbohydrate (Cassava and soybean powder) were used to facilitate bio-floc forming at C/N ratio above 12. Results showed that the highest bio-floc volume ranged from 9.1±4.1 to 11.8±6.5 mL/L, and there was no significant difference in bio-floc volume among treatments (p>0.05). After 28 days length (4.69 ± 0.43 mm) and weight (0.70 ± 0.15 g) of shrimp in treatment 3 was significantly higher than those of treatment 4 and 5 (p<0.05) but there was no significant difference in length and weight of shrimp between treatment 1 , 2 and 3 (p>0.05). The lowest survival rate was found in treatment 5 (74.8 ± 5.4%) which was significantly lower than shrimp survival rate in other treatments (p<0.05). The highest shrimp survival rate was found in treatment 3 (94.7 ± 0.3%). Results indicated that rearing white leg shrimp postlarvae at stocking density of 2.000 PL/m3 following application of bio-floc technology obtained the best growth performance and survival rate.
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