Effects of 17ß-estradiol Hormone on Growth and Sex Differentiation in the Mozambique Tilapia (Oreochromis mossambicus, Peters, 1852)

Abstract

In this study, the effects of 17-ß-estradiol hormone on the zootechnic performances and sex ratioof Mozambique Tilapia (Oreochromis mossambicus. Peters, 1852) fry were investigated in order toinitially produce functional phenotypical females and then super males. To this end, different E2concentrations (50, 100, 150 and 200 ppm) were tested over a period of 45 days in a closed recirculating system. The evaluations showed that the female ratio was significantly (p value= 0.04 andα=0.05) higher in all treatment groups ranging from 61.90% to 86.36% compared to the controlgroup. Growth was significantly higher (F value=22.78 and p value=0.00) in the control groupcompared to the treatment ones.