Table 1:
The levels of heavy metals in the liver, kidney, gills and heart of Clarias gariepinus from the Ogun River (test sample) and Agodi River (control).
| Heavy Metals | Organs of fish | |||
|---|---|---|---|---|
|
| ||||
| Heart | Gills | Kidney | Liver | |
| Zn (ppm) | ||||
| Control | 0.3 ± 0.01 | 0.40± 0.02 | 0.80 ± 0.01 | 0.9± 0.01 |
| Test sample | 8.96 ± 0.90* | 20.35 ± 0.98* | 19.05 ± 2.34* | 19.75 ± 1.87* |
| % Change | 2886 | 4987 | 2281 | 2094 |
|
| ||||
| Pb (ppm) | ||||
| Control | ND | 0.02± 0.01 | 0.03± 0.01 | 0.06± 0.02 |
| Test sample | 1.69 ± 0.96 | 2.40 ± 0.55* | 3.35 ± 0.38* | 3.40 ±0.72* |
| % Change | - | 11900 | 11066 | 5566 |
|
| ||||
| Cu (ppm) | ||||
| Control | 0.09± 0.02 | 0.13±0.01 | 0.15± 0.01 | 0.18± 0.02 |
| Test sample | 2.19 ± 0.33* | 4.55 ± 0.54* | 5.0 ± 0.50* | 4.70 ± 0.60* |
| % Change | 2333 | 3400 | 3233 | 2511 |
|
| ||||
| Cd (ppm) | ||||
| Control | ND | ND | ND | 0.01 |
| Test sample | 0.25 ± 0.13 | 2.05 ± 0.48 | 0.69 ± 0.43 | 2.10 ± 0.58 |
| % Change | - | - | - | 20900* |
|
| ||||
| As (ppm) | ||||
| Control | ND | ND | ND | ND |
| Test sample | 1.0 ± 0.1 | 1.95 ± 0.82 | 2.30 ± 0.0.86 | 2.15 ± 0.42 |
| % Change | - | - | - | - |
The results are expressed as mean of 10 fishes ± SD.
*
Significantly different from control, p<0.001. ND= Not detected.