M. Zaki, F., M. Said, M., Tahoun, A., Amer, M. (2021). Evaluation of Different Sex Reversal Treatments in Red Tilapia Hybrid. Egyptian Journal of Aquatic Biology and Fisheries, 25(1), 279-292. doi: 10.21608/ejabf.2021.140630
Fatma M. Zaki; Mohamed M. Said; Al-Azab Tahoun; Mohamed Amer. "Evaluation of Different Sex Reversal Treatments in Red Tilapia Hybrid". Egyptian Journal of Aquatic Biology and Fisheries, 25, 1, 2021, 279-292. doi: 10.21608/ejabf.2021.140630
M. Zaki, F., M. Said, M., Tahoun, A., Amer, M. (2021). 'Evaluation of Different Sex Reversal Treatments in Red Tilapia Hybrid', Egyptian Journal of Aquatic Biology and Fisheries, 25(1), pp. 279-292. doi: 10.21608/ejabf.2021.140630
M. Zaki, F., M. Said, M., Tahoun, A., Amer, M. Evaluation of Different Sex Reversal Treatments in Red Tilapia Hybrid. Egyptian Journal of Aquatic Biology and Fisheries, 2021; 25(1): 279-292. doi: 10.21608/ejabf.2021.140630
Evaluation of Different Sex Reversal Treatments in Red Tilapia Hybrid
Effects of dietary inclusion of Tribulus terrestris and 17 α-methyltestosterone on sex reversal, growth performance, feed utilization, and survival rates of red tilapia were evaluated in this study. Red tilapia fry with an average weight of 0.02 ±0.003 g and an average length of 0.6 ±0.012 cm were subjected to six different sex reversal treatments. The experiment lasted for 112 days. Two T. terrestris extract treatments (1and 2 g/kg diet); three hormonal treatments with 17 α-methyltestosterone ( 30,60 and 100 mg/kg diet), were applied in this experiment plus a control group. The results of this study revealed that all plant and hormonal treatment showed significantly higher male percentages (p≤0.05) than the control. The highest male percentage of (90%) was achieved at the dose of 60 mg 17 α-methyltestosterone/kg followed by T. terrestris extract at 2 g/kg with a male percentage of (84.4%). Growth performance and feed utilization of red tilapia were better in the two treatments of T.terrestris extract, followed by the hormonal dose 60 mg/kg diet, than other treatments. A significantly higher survival rate of 85.44%, 83.33%, and 83.11% was achieved at 1 and 2 g T. terrestris extract/kg and the control respectively. The lowest survival (71.56%) was observed at the 100 mg 17 α -MT/ kg diet (p ≤ .05). Testes weight was significantly higher at 2 g T. terrestris extract/kg diet treatment compared with the other treatments and the control. The highest male gonado-somatic index records were found at the control and 2 g T. terrestris extract/ kg diet treatments. Conclusively, the addition of T. terrestris extract and 17 α –MT into red tilapia hybrid fry diets contributes in producing almost all-male tilapia population and enhancing growth performance and feed utilization of the fish.
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