Abstract
Fresh hatchlings of Oreochromis niloticus was fed with 17 α methyltestosterone (MT) at 30 µg/g diet for 28 days. Comparative analysis of hormone treated fish with non hormone treated fish indicated improved growth in the former by 44.3% in six months of rearing in outdoor concrete tanks. In both indoor and outdoor rearing conditions, hormone treatment did not have any negative significant effect on survival. Sex ratio in the hormone treated group was 12 males: 1female, and 1.5 males: 1 female in the untreated group. There is a significant difference in the expected 1:1 ratio of sexes in MT treated group which indicated that sex reversal of genetic females to males was successful using 17 α methyltestosterone at 30 µg/g diet for 28 days.
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