الفهرس 
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Abstract
Red tilapia fry with an average of 0.02 ± 0.003g and an average length of 0.6± 0..12 cm. were subjected to six different sex reversal treatments. The experiment lasted for 112 days. Two T. terrestris extract treatments (land 2g/kg diet) three hormonal treatments with 17a-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. Growth performance and feed utilization of red tilapia were better in the two treatments of T. terrestris extract followed by the hormonal dose 60mg/kg diet than other treatments. Significantly hogher survival rates wrer achieved at 1 and 2 g T. terrestris extract/kg.