Table 4.
Effect of dietary supplementation with Astragalus membranaceus polysaccharides (AS) levels (0.15 and 0.30%) and/or exposure to thallium (Tl) toxicity (1/10th LC50; 41.9 μg/l) for 8 weeks on the disease resistance of Nile tilapia challenged with Aeromonas hydrophila.
| Parameters | Experimental groups | |||||
|---|---|---|---|---|---|---|
| CNT | AS0.15 | AS0.30 | Tl | AS0.15+Tl | AS0.30+Tl | |
| Total No. of challenged fish | 30 | 30 | 30 | 30 | 30 | 30 |
| Number of dead fish | 2 | 0 | 0 | 7 | 4 | 3 |
| Relative percent survival (RPS) (%) | 93.33 | 100 | 100 | 76.66 | 86.66 | 90 |
| Cumulative mortality rate (CMR) (%) | 6.66 | 0 | 0 | 32.33 | 13.33 | 10.0 |