Table 3.
Summary of the growth performance 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 | Initial Weight (g) | Average Weight Gain (g) | FCR | SGR | DGI | Survival | TGC |
|---|---|---|---|---|---|---|---|---|
| FM | 0% | 19.1 ± 0.26 | 186 ± 3.46 | 0.66 ± 0.02 | 3.01 ± 0.04 | 4.08 ± 0.05 | 100 ± 0.0 | 0.26 ± 0.01 |
| FM | 0.5% | 19.07 ± 0.4 | 173.33 ± 1.53 * | 0.71 ± 0.04 | 2.92 ± 0.03 | 3.92 ± 0.03 | 98.97 ± 1.79 | 0.26 ± 0.01 |
| FM | 1% | 19.23 ± 0.32 | 190.33 ± 4.93 * | 0.65 ± 0.02 | 3.02 ± 0.04 | 4.12 ± 0.06 * | 95.87 ± 3.58 | 0.27 ± 0.01 |
| FM | 2% | 19.17 ± 0.25 | 182.67 ± 3.21 | 0.72 ± 0.11 | 2.98 ± 0.02 | 4.04 ± 0.04 | 96.9 ± 0.0 | 0.26 ± 0.0 |
| PM | 0% | 19.33 ± 0.23 | 236.33 ± 15.37 | 0.84 ± 0.1 | 3.27 ± 0.06 | 4.63 ± 0.15 | 97.93 ± 1.79 | 0.3 ± 0.01 |
| PM | 0.5% | 19.3 ± 0.17 | 243.33 ± 12.66 | 0.8 ± 0.06 | 3.3 ± 0.06 | 4.71 ± 0.13 | 100 ± 0.0 | 0.31 ± 0.01 |
| PM | 1% | 18.93 ± 0.25 | 240 ± 21.66 | 0.86 ± 0.03 | 3.31 ± 0.09 | 4.69 ± 0.21 | 98.97 ± 1.79 | 0.3 ± 0.02 |
| PM | 2% | 19.1 ± 0.2 | 238 ± 17.35 | 0.83 ± 0.07 | 3.29 ± 0.08 | 4.66 ± 0.18 | 100 ± 0.0 | 0.3 ± 0.01 |
| One-way ANOVA | FM: PSP level | 0.918 | 0.002 | 0.434 | 0.022 | 0.003 | 0.119 | 0.163 |
| PM: PSP level | 0.161 | 0.962 | 0.759 | 0.893 | 0.956 | 0.219 | 0.908 |
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. FCR—feed conversion ratio; SGR—specific growth rate; DGI—daily growth index; TGC—thermal growth coefficient. Bold asterisks (*) represent significant differences from Welch’s t-test conducted between pistachio shell powder (PSP) inclusion levels (0.5, 1, 2%) and the control (0%), within fishmeal (FM) or plant meal (PM) diets.