Table 1.
Residual Cu concentrations (mg/kg dry weight [mean ± SE]) in selected organs of O. niloticus (O. n.) and M. cephalus (M. c.) (N = 8)
| Organs | Site 1 (reference site) | Site 2 (Lake Qaroun) | Site 3 (Qaroun fish farms) | P F< | |
|---|---|---|---|---|---|
| Liver | O. n. | 2.30a ± 0.23C | 184.85a ± 23.75A | 111.31a ± 3.40B | 0.01 |
| M.c. | 1.85a ± 0.23C | 68.84b ± 6.60B | 98.16b ± 4.55A | 0.01 | |
| P t< | NS | 0.01 | 0.05 | ||
| Kidney | O. n. | 2.24a ± 0.30B | 50.74a ± 4.88A | 58.55a ± 4.33A | 0.01 |
| M.c. | 1.42b ± 0.17C | 36.15a ± 5.23A | 17.08b ± 1.45B | 0.01 | |
| P t< | 0.05 | NS | 0.01 | ||
| Gill | O. n. | 4.05a ± 0.20C | 14.92a ± 1.26A | 11.36b ± 0.94B | 0.01 |
| M.c. | 2.75b ± 0.27C | 12.97a ± 0.70B | 15.67a ± 0.86A | 0.01 | |
| P t< | 0.01 | NS | 0.01 | ||
| Skin | O. n. | 4.35a ± 0.54C | 10.83a ± 0.68A | 6.73b ± 0.34B | 0.01 |
| M.c. | 3.71a ± 0.48B | 9.13a ± 0.66A | 8.69a ± 0.41A | 0.01 | |
| P t< | NS | NS | 0.01 | ||
| Muscle | O. n. | 0.66a ± 0.07C | 13.22a ± 1.50A | 9.38a ± 0.92B | 0.01 |
| M.c. | 0.29b ± 0.04B | 7.32b ± 0.92A | 6.05b ± 0.45A | 0.01 | |
| P t< | 0.01 | 0.01 | 0.05 | ||
Means with the same superscript lower-case letter in the same column, and means with the same superscript capital letter in the same row, for each parameter are not significantly different. Student t test was performed between two fish species for each parameter in each site (P t), whereas F test was performed between three locations for each organ and each fish species (P F)