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| Concentration (mg/L) | Immobility/mortality | Total no. of organisms | Effect |
|---|---|---|---|
| control | 1 | 20 | 5 |
| 0.1 | 1 | 20 | 5 |
| 0.2 | 1 | 20 | 5 |
| 0.4 | 2 | 20 | 10 |
| 0.8 | 2 | 20 | 10 |
| 1.6 | 10 | 20 | 50 |
| 3.2 | 20 | 20 | 100 |
