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.
M. Marjani, S. Jamili, P.G. Mostafavi, M. Ramin and A. Mashinchian, 2009. Influence of 17-Alpha Methyl Testosterone on Masculinization and Growth in Tilapia (Oreochromis mossambicus). Journal of Fisheries and Aquatic Science, 4: 71-74.
24 June, 2009
ZOU Qin: Dear author:Do you think it is significant to research 17-alpha Methyltestosterone on Masculinization and Growth in Tilapia ? As you know 17-alpha Methyltestosterone is a forbidden drug that using in aquaculture.Thank you! Looking forward to communicate with you!