Discarded Sun-dried Potatoes (Solanum tuberosum L.) as Untraditional Source of Energy in the Nile Tilapia (Oreochromis niloticus) Fingerlings Diets | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 161, Volume 29, Issue 4, July and August 2025, Page 4941-4963 PDF (401.45 K) | ||||
| DOI: 10.21608/ejabf.2025.446725 | ||||
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| Author | ||||
| El-Nadi et al. | ||||
| Abstract | ||||
| This study evaluated the effects of incorporating sun-dried discarded potatoes (SDDP) at 0, 15, 30, and 45% inclusion levels into the diets of the Nile tilapia (Oreochromis niloticus). A total of 120 fingerlings (174.25 ± 1.71 g) were stocked in 12 aquaria (100 L each) at a density of 10 fish per tank. SDDP contained 8.08% crude protein (CP), 3.06% crude fiber (CF), 0.10% ether extract (EE), 86.66% nitrogen-free extract (NFE), 2.10% ash, and 4,189 kcal/kg dry matter (DM) gross energy. All experimental diets were iso-caloric and iso-nitrogenous. Growth performance parameters—final weight, total gain, average daily gain (ADG), and specific growth rate (SGR)—were significantly (P< 0.05) higher in SDDP-fed groups than in the control. Survival rate was 93.33% in the control and 100% in all treated groups. Feed conversion ratio (FCR) and protein efficiency ratio (PER) also improved with SDDP inclusion. Most blood parameters were significantly affected (P< 0.05), except for the albumin-to-globulin ratio, creatinine, cholesterol, triglycerides, and bilirubin. Whole-body composition analysis showed significant increases in organic matter (OM), CP, and gross energy, and decreases in moisture, EE, and ash. Energy retention (ER%) increased by 18.79%, 39.99%, and 42.75%, while protein productive value (PPV%) improved by 22.52%, 45.87%, and 53.18% in the D2, D3, and D4 groups, respectively, compared to the control. Feed formulation costs decreased with increasing SDDP levels, accompanied by notable improvements in economic efficiency. These results indicate that replacing yellow corn with SDDP at levels up to 45% enhances growth, nutrient retention, and cost efficiency without adverse effects on fish health or performance. | ||||
| Keywords | ||||
| Sun-dried discarded potatoes; The Nile tilapia fish; Productive performance; Feed utilization; Blood parameters; Fish body composition; Economical evaluation | ||||
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