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Journal of Fisheries and Aquatic Science

Year: 2009  |  Volume: 4  |  Issue: 1  |  Page No.: 71 - 74

Influence of 17-Alpha Methyl Testosterone on Masculinization and Growth in Tilapia (Oreochromis mossambicus)

M. Marjani, S. Jamili, P.G. Mostafavi, M. Ramin and A. Mashinchian


In the present study, effect of different dose rates of synthetic androgen 17-alpha Methyl Testosterone (MT) i.e., 50, 75 and 100 mg of hormone in per kg of feed, on sex reversal and growth performance of Mozambique tilapia was evaluated. MT was administrated orally by using pellet dry starter and Ethanol Alcohol, diet to tilapia fry for 21 days in glass aquaria. The fry were also kept for 2 weeks after feeding to monitor its growth performance. At the end of the experiment the sex ratio was determined by examining the gonads after dissecting the fish. Growth performance was monitored by recording the morphometric characteristics. Wet body weight and total length of fish on start of feeding end of feeding and two weeks after feeding were measured. The results of the present study showed that all MT receiving treatment showed a significantly higher male proportion than the control experiment. Dose rate of 75 mg kg-1 MT of feed resulted in maximum male population (98.09%) with 1.91% sterilized fish. The dose rate of 75 mg kg-1 MT gave the maximum gain in body weight i.e., 11.8 g, which is 1.2 times greater than the control.

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