Effect of hormonal treatment on sex reversal of Nile Tilapia (Oreochromis niloticus) fry
2011
Ali Abumhara, A.,Ceska Zemedelska Univ., Prague (Czech Republic). Inst. Tropu a Subtropu | Mahmoud Yadem, S.,Alexandria Univ. (Egypt). Dept. of Animal Husbandry | Sovjak, R.,Ceska Zemedelska Univ., Prague (Czech Republic). Inst. Tropu a Subtropu
This study was conducted to develop a short-term immersion procedure for masculinisation of Oreochromis niloticus using 17alpha-methyltestosterone at 100, 200 or 400 microg/L for 3, 6 or 12 h. Fry were immersed tow successive times with 3 days interval period. The highest percentage of male Oreochromis niloticus (96+/-4%) and the lowest gonado-somatic index of female Oreochromis niloticus (1.89+/-0.02) were obtained by immersion of fry in 17alpha-methyltestosterone at the level of 400 microg/L for 6 h. However, survival rate of Oreochromis niloticus fry during hormone treatment period did not differ significantly from survival rate in the control group.
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