Table 1.
The information of pond production
| Details | Pond no | |||
|---|---|---|---|---|
| A | B | C | D | |
| Pond size (m2) | 4,000 | 4,000 | 4,000 | 4,000 |
| Culture period (days) | 72 | 72 | 70 | 73 |
| Initial stocking | 160,000 | 160,000 | 200,000 | 180,000 |
| Stocking density (shrimp/m2) | 40 | 40 | 50 | 45 |
| Count (shrimp/kg) | 39 | 41 | 41 | 42 |
| Harvest size (g) | 25.6 | 24.4 | 24.4 | 23.8 |
| Shrimp harvest (kg) | 3900.0 | 3900.0 | 3980.0 | 3872.6 |
| Total feed used (kg) | 5091.8 | 5241.8 | 5053.5 | 5427.5 |
| Survival rate (%) | 95 | 100 | 82 | 90 |
| Feed conversion rate | 1.31 | 1.34 | 1.27 | 1.4 |
| Prize (US $/kg) | 6.38 | 6.38 | 6.38 | 6.38 |
| Total income (US $) | 24,879.3 | 24,879.3 | 25,389.7 | 24,704.5 |