Table 2.
Growth performance of Nile tilapia (Oreochromis niloticus) fish subjected to heavy metals, mercury (Hg) and cadmium (Cd), and treated with biosynthesized selenium nanoparticles (BioSeNPs) during the 10-week experimental period.
| Group | Subgroups | Cd + Hg(μg ml−1) | BioSeNPs(μg ml−1) | IW(g) | FW(g) | WG(g) | SGR (%/day) | TFI(g /fish) | FCR | SR (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1Z | – | – | 20.0a | 45.0d | 25.0d | 0.5b | 35.0d | 4.8ab | 100.0a |
| 1A | – | 3 | 20.5a | 55.0c | 34.5c | 0.7a | 51.0bc | 4.6b | 100 | |
| 1B | – | 4 | 19.8b | 57.0b | 37.2b | 0.7a | 52.0b | 4.0d | 100 | |
| 1C | – | 5 | 20.0a | 58.0a | 38.0a | 0.7a | 54.0a | 4.2d | 100 | |
| 2 | 2Z | 0.5 + 0.5 | – | 19.0b | 47.0d | 27.0 cd | 0.59c | 41.0 cd | 4.7ab | 91.0d |
| 2A | 0.5 + 0.5 | 3 | 19.0b | 52.0 cd | 33.0c | 0.6b | 48.0c | 4.3c | 94.3c | |
| 2B | 0.5 + 0.5 | 4 | 19.5b | 54.0c | 34.5c | 0.6b | 50.0bc | 4.5b | 94.7b | |
| 2C | 0.5 + 0.5 | 5 | 20.0a | 55.0c | 35.0bc | 0.7a | 52.0v | 4.6b | 95.0b | |
| 3 | 3Z | 1.0 + 1.0 | -- | 19.4b | 48.1d | 28.7 cd | 0.52c | 47.0c | 5.0a | 89.9e |
| 3A | 1.0 + 1.0 | 3 | 20.4a | 51.3 cd | 30.9 cd | 0.6b | 46.7 cd | 4.4bc | 92.8d | |
| 3B | 1.0 + 1.0 | 4 | 19.2b | 52.5 cd | 33.3c | 0.6b | 48.0c | 4.5b | 93.5c | |
| 3C | 1.0 + 1.0 | 5 | 19.5b | 54.0c | 34.5c | 0.6b | 49.0c | 4.8ab | 93.0c |
Means in the same column with lowercase different letters are significantly different at p ≤ 0.05. IW, initial weight; FW, final weight; WG, weight gain; SGR, specific growth rate; TFI, total feed intake; FCR, feed conversion ratio; SR, survival rate.