The optimum level of dietary protein and feeding for improving the growth performance and feed efficiency of juveniles Hybrid tilapia (Oreochromis niloticus× Oreochromis aurea) reared in brackish water | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 51, Volume 25, Issue 4, July and August 2021, Page 839-856 PDF (514.69 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2021.195285 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Ashraf Y. El-Dakar et al. | ||||
| Abstract | ||||
| A 6-weeks factorial trial (2 × 2) was conducted to determine the optimum level of dietary protein and the optimum feeding rate for the best growth and feed efficiency of hybrid tilapia, Oreochromis niloticus × Oreochromis aurea. Two dietary protein levels were examined; 27% and 34% CP with 5% and 7% of the biomass, and each treatment was performed in triplicate. Twelve plastic tanks (54 × 38 × 28 cm: L × W × H) were used to accomplish this work. The average initial weight was determined (7.5 ± 0.16 g), and fish samples were stocked (12 juveniles/tank). Fishes were fed three times daily and 6 days weekly. The water was daily exchanged at a rate of about 20% of water volume/tank. Results showed that dietary protein levels (from 27% to 34%) did not significantly affect either growth or feed usage parameters. However, 7% feeding rate had significantly higher growth parameters than 5%. Statistical analysis of the interaction between dietary protein and feeding levels showed that fishes fed at 7% as the feeding level with dietary protein at 27% or 34% was significantly higher in growth than those fed at 5% with the same diets. Additionally, results confirmed the significant difference in specific growth rate and survival rate of fishes fed at 7% as feeding rate with any diet protein level. Thus, this study suggests that 27% CP with 7% as feeding rate is more for the best growth of hybrid tilapia juvenile under the same conditions of this trial. | ||||
| Keywords | ||||
| Dietary protein level; Feeding level; Hybrid tilapia; Growth parameters; Feed utilization | ||||
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