摘要
The present study was carried out to investigate the total and partial replacement of Jojoba meal （JM）, Simmondsia chinensis, with fishmeal （FM） at different levels （0%, 25%, 50%, 75%, and 100%） on growth performance, feed utilization, and carcass composition of Nile tilapia, Oreochromis niloticus fingerlings. Fingerlings with an average weight of 1.65 ± 0.01 g/fish stocked at a rate of 10 fish/aquarium for 84 days experimental period. All experimental diets were isocaloric （437.69 kcal/100 g Dry Matter, DM） and isonitrogenous （30.5% crude protein） and supplemented with 0.5% L-Methionine and 0.5% L-Lysine Hcl. Results showed that there were a significant differences （P 〈 0.05） in final body weights, average daily gain （g fish^-1 dayl）, specific growth rate （SGR, % day^-1）, feed conversion ratio （FCR）, protein efficiency ratio （PER）, protein productive value （PPV%） and energy retention （ER%） among the tested groups. Nile tilapia fingerlings fed on the diet containing 25% S. chinensis protein exhibited comparable growth performance to those fed FM protein based diet. Carcass composition of crude protein decreased significantly （P 〈_ 0.05） with increasing JM replacement level above 50%, while replacement 25% JM does not affect DM and Crude Protein of fish flesh. On the other hand, increasing JM replacement level up to 75% increased Ether Extract % significantly （P 〈 0.05） and increasing JM up to 100% increased ash content significantly （P ≤ 0.05） while energy content （EC） decreased. It could be concluded the replacement of 25% Jojoba meal instead of fishmeal in Nile tilapia fingerlings diets is possible without any adverse effects on its growth performance or feed utilization.
