Table 3. Determined energy, nutrients, and trace element levels in various treatment diets (dry-matter basis).
| Fish oil | Algae meal | ||||||
|---|---|---|---|---|---|---|---|
| Parameter | Control | 1% | 3% | 5% | 1.75% | 5.26% | 8.77% |
| Caloric content (cal/g) | |||||||
| Total calories | 4940 | 4830 | 4810 | 4930 | 4900 | 4880 | 4850 |
| Proximate and mineral levels | |||||||
| Crude protein | 37.0 | 36.5 | 35.5 | 35.7 | 37.3 | 35.5 | 36.5 |
| Carbohydrate1 | 33.7 | 36.6 | 37.7 | 37.3 | 36.4 | 37.9 | 35.7 |
| Total ash | 9.18 | 9.19 | 9.12 | 8.96 | 8.80 | 8.55 | 8.38 |
| Crude fat | 10.20 | 9.17 | 9.55 | 9.56 | 10.20 | 10.30 | 10.60 |
| Crude fiber | 4.00 | 4.50 | 4.00 | 3.80 | 5.10 | 3.90 | 5.80 |
| Calcium | 2.08 | 2.14 | 2.11 | 2.10 | 2.10 | 2.01 | 1.91 |
| Phosphorus | 1.41 | 1.45 | 1.42 | 1.40 | 1.40 | 1.33 | 1.27 |
| Potassium | 1.31 | 1.25 | 1.28 | 1.29 | 1.30 | 1.26 | 1.29 |
| Magnesium | 0.24 | 0.23 | 0.24 | 0.24 | 0.24 | 0.27 | 0.26 |
| Sodium | 0.16 | 0.15 | 0.15 | 0.16 | 0.14 | 0.16 | 0.15 |
| Trace element levels (ppm) | |||||||
| Iron | 226 | 215 | 224 | 223 | 222 | 224 | 208 |
| Copper | 24 | 21 | 22 | 21 | 21 | 21 | 21 |
| Zinc | 305 | 285 | 317 | 272 | 274 | 299 | 271 |
| Manganese | 101 | 71 | 88 | 122 | 101 | 83 | 92 |
1Calculated value (Merrill and Watt, 1973): Carbohydrate = total—(ash + crude protein + moisture + total fat)