Table 4.
Effect of Lethal and Sub-lethal concentrations of copper sulphate on the ventilation frequency (beats/min) of Esomus danricus at the end of 24h, 48h, 72h and 96h.
| Conc. Of Copper | Period of Exposure | Ventilation frequency (beats/min) | % Change | ‘t’ Value | Result | |
|---|---|---|---|---|---|---|
|
| ||||||
| Control X̄ ± SD | Experiment X̄ + SD | |||||
| 5.5 mg/L | 24 h | 115 ± 6.20 | 69 ± 10.25 | −6.09 | 1.4768 | P>0.05 |
| 48 h | 74 ± 8.86 | −16.52 | 2.9840 | P<0.05 | ||
| 72 h | 96 ± 12.83 | −35.65 | 8.7674 | P<0.001 | ||
| 96 h | 108 ± 8.60 | −40.00 | 8.5927 | P<0.001 | ||
|
| ||||||
| 0.55 mg/L | 24 h | 115 ± 6.20 | 84 ± 7.18 | −0.87 | 0.1734 | P>0.05 |
| 48 h | 88 ± 9.03 | −6.09 | 1.4152 | P>0.05 | ||
| 72 h | 108 ± 9.17 | −23.48 | 5.5153 | P<0.001 | ||
| 96 h | 114 ± 11.64 | −26.96 | 7.3120 | P<0.001 | ||