Table 4.
Summary of the whole-body proximate analysis of rainbow trout fed either fishmeal (FM)- or plant meal (PM)-based diets, supplemented with graded levels of pistachio shell powder (PSP: 0, 0.5, 1, 2%) for 12 weeks.
| Diet | PSP Level | Whole Body Moisture | Whole Body Protein | Whole Body Ash | Whole Body Energy (cal) | Protein Efficiency | Protein Retention (%) | Energy Retention (%) |
|---|---|---|---|---|---|---|---|---|
| FM | 0% | 67.47 ± 0.59 | 15.6 ± 0.72 | 1.47 ± 0.07 | 2300.7 ± 34.26 | 3.09 ± 0.06 | 48.73 ± 2.9 | 65 ± 1.03 |
| FM | 0.5% | 68 ± 0.36 | 15.97 ± 0.63 | 1.68 ± 0.13 | 2230.33 ± 40.21 | 2.86 ± 0.18 | 46.18 ± 1.14 | 58.87 ± 4.87 |
| FM | 1% | 66.97 ± 0.54 | 15.72 ± 0.67 | 1.58 ± 0.11 | 2265.87 ± 111.28 | 3.2 ± 0.09 | 50.79 ± 1.53 | 65.39 ± 5.2 |
| FM | 2% | 67.25 ± 0.74 | 15.75 ± 0.16 | 1.59 ± 0.11 | 2301.22 ± 127.79 | 2.85 ± 0.4 | 45.42 ± 6.43 | 59.78 ± 7.22 |
| PM | 0% | 68.25 ± 0.63 | 16.19 ± 0.38 | 1.91 ± 0.03 | 2164.52 ± 74.12 | 2.87 ± 0.33 | 47.01 ± 6.22 | 57.06 ± 8.45 |
| PM | 0.5% | 68.05 ± 0.51 | 16.68 ± 0.26 | 1.97 ± 0.09 | 2181.62 ± 30.68 | 3.04 ± 0.24 | 51.48 ± 4.77 | 56.43 ± 4.57 |
| PM | 1% | 68.08 ± 0.81 | 16.68 ± 0.2 | 1.85 ± 0.31 | 2174 ± 63.31 | 2.75 ± 0.09 | 46.43 ± 1.69 | 51.94 ± 3.28 |
| PM | 2% | 68.81 ± 1.36 | 16.76 ± 0.32 | 2.12 ± 0.21 | 2091.8 ± 91.13 | 2.79 ± 0.27 | 47.37 ± 5.16 | 50.5 ± 4.77 |
| One-way ANOVA | FM: PSP level | 0.239 | 0.888 | 0.200 | 0.734 | 0.235 | 0.323 | 0.327 |
| PM: PSP level | 0.711 | 0.159 | 0.406 | 0.405 | 0.504 | 0.578 | 0.437 |
Data for each experimental group are reported as mean ± standard deviation from triplicate tanks. Results were subjected to a one-way ANOVA to specifically evaluate PSP inclusion within each diet type.