FEMINIZATION OF NILE TILAPIA Oreochromis niloticus (L.) BY DIETHYLSTILBESTROL GROWTH AND GONADOSOMATIC INDEX/Feminización de la tilapia del nilo Oreochromis niloticus (L.) mediante dietilestilbestrol. Crecimiento e índice gonadosomático
2016
José Antonio Marín-Ramírez | Juan Pablo Alcántar-Vázquez | Carolina Antonio-Estrada, | Raúl Moreno-de la Torre | Daniel Calzada-Ruiz
Sex-reversal by exogenous hormones is the most common technique used to generate monosex populationsof Nile tilapia (Oreochromis niloticus). However, this technique has provoked a negative perception in recentyears. Because of this, alternative techniques have been developed, including the production of YY males. Althoughthe nal product (for sale) is not administered hormones, the rst part of this technique still requires the feminizationof XY fry by use of estrogens, including some of a synthetic nature, such as diethylstilbestrol (DES), an estrogen thathas shown particularly excellent results in related species. The aim of this study was to evaluate the eect of increasingconcentrations of DES (100, 200, 300, and 400 mg kg−1) during the fry stage on the sex proportion, growth andgonadosomatic index (GSI) of Nile tilapia. The 400 mg kg−1concentration was the one that produced the highestproportion of females (91 %). However, increasing the concentration of DES provided through diet does not guaranteea 100 % feminization rate. Additionally, the growth, survival and GSI, showed a signicant decrease (p < 0.05) in allgroups fed with DES compared to the control group. It is possible that the anabolic eect of DES observed in otherspecies is not present in Nile tilapia
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