Résumé
Effect of graded levels of Jujube (Ziziphus mauritiana Lam.) leaf meal on growth performance of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) was investigated to evaluate the efficiency of leaf meal on growth performance of O. niloticus fingerlings. Proximate composition and antinutritional factor of the Jujube leaf was conducted to ascertained its nutritional value. Four (4) different graded levels of Z. mauritiana; 0 (control), 5, 10, and 15% designated as diet I (DI), diet II (DII), diet III (DIII) and diet IV (DIV), respectively, were incorporated into 35% crude protein diet. Twelve (12) hapas (1m × 1m × 1m) were installed in polyethylene lined fish pond (7 × 5 × 1.2m) stocked with ten (10) O. niloticus fingerlings (4.62 ± 0.39g weight and 5.68 ± 0.28cm length). The Jujube leaf based-diets were allotted to the fish in hapa at random in three replications and were cultured for ten weeks (70days). The results showed that Z. mauritiana leaf has 25.00% crude protein, 15.11% crude fiber, 3.90% ether extract, 4.10% ash, 5.95% moisture and 51.89% nitrogen free extract. The anti-nutritional factors were alkaloid (10.75 mg/g), tannins (1.15 mg/g), oxalate (12.03 mg/g), phytate (3.33 mg/g) and saponin (24.57 mg/g). Better weight gain (92.0g) was obtained in the fish fed 5% Jujube leaf-based diet while the least weight gain was observed in fish fed 15% (60.33g) Jujube leaf-based diet. This study concludes that Jujube leaf meal can be incorporated into the diets of O. niloticus fingerlings up to 5% without compromising the fish growth.
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