Journal of Fisheries and Aquatic Science1816-49271996-0751Academic Journals Inc.10.3923/jfas.2012.447.453O. niloticusx O. mossambicus) Larvae]]>H. MohamedAsaad Ferdinand M. TraifalgarRex E. SerranoAugusto P. PeraltaJose L. PedrosoFiona 6201276Effects of a steroid hormone Dehydroepiandrosterone (DHEA) on sex differentiation of hybrid red Tilapia Oreochromis niloticusxO. mossambicus larvae were investigated. Three day-old tilapia larvae were fed diets supplemented with varying concentrations of DHEA (0, 20, 40, 80 and 160 mg kg-1 feed) for 24 days. A positive control group fed with diet containing 60 mg kg-1 of 17α-methyl testosterone was also included in the experimental run. Results indicate that among the DHEA treatment groups, larvae fed with 160 mg kg-1 DHEA showed the highest percentage of males that is comparable to the number of differentiated male fish observed in treatment group receiving the 17α-methyl testosterone as the positive control group. DHEA supplementation also improves weight gain and enhances feed conversion ratio. These findings suggest that DHEA can be used as a dietary supplement to induce masculinization and can improve the growth performance of tilapia larvae.]]>Adel, M.E.S., A. Ashraf, A. Ramadan and A.E. Khattab,20062006Afonso, L.O.B., G.L. Wasserman and R.T. de Olivoria,2001Oreochromis niloticus) using a non-steroidal aromatase inhibitor.]]>290177181Balarin, J.D. and C. Haller,1983Pages: 265Pages: 265Baroiller, J.F., A. Fostier and B. Jalabert,19881988pp: 137-141pp: 137-141Barrett-Connor, E., D.G. von Muhlen and D. Kritz-Silverstein,199984573577Ceci, R., G. Duranti, A. Rossi, I. Savini and S. Sabatini,201143702707Cek, S., Y. Yıldırım, H. Sereflişan and I. Akyurt,20042004pp: 343353Wang, C. and R.P. Croll,2004Placopecten magellanicus.]]>238483498Contreras-Sanchez, W.M., M.S. Fitzpatrick and C.B. Schreck,20012001Guerrero, III.R.D. and L.A. Guerrero,19881988pp: 183186Jae-Yoon, J., R.O. Smitherman and L.L. Behrennds,19881988pp: 203207Labrie, F., V. Luu-The, A. Belanger, S.X. Lin, J. Simard, G. Pelletier and C. Labrie,2005187169196Mair, G.C., J.S. Abucay, D.O.F. Skibinski, T.A. Abella and J.A. Beardmore,1997Oreochromis niloticus L.]]>54396404Nuanmanee, P., S. Siangwan and J. Nitharn,200457251259Paiva, P.,198815109114Popma, T.J. and B.W. Green,19901990Phillips, G.B., B.H. Pinkernell and T.Y. Jing,199414701706Ridha, M.T. and K.P. Lone,200821391397Shah, A.H., E.H. Chin, K.L. Schmidt and K.K. Soma,2011197949958Sparks, R.T., B.S. Shepherd, B. Ron, N.R. Harold and L.G. Riley et al.,2003Oreochromis mossambicus.]]>136657665Vorasayan, P. and N. Petchrich,200457163166Colker, C.M., G.C. Torina, M.A. Swain and D.S. Kalman,19991999Tayament, M.M. and W.L. Shelton, 1978Sarotherodon niloticus.]]>14349354