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Effect of dietary administration of the phytochemical genistein (3,5,7,3,4 pentahydroxyflavone) on masculine tilapia, oreochromis niloticus

Author:A.A. Akinwande, A.A. Dada and F.O. Moody

Abstract:
In Tilapia aquaculture, it is more desirable to culture all male (monosex) population because they grow bigger and faster. The synthetic steroid hormones such as 17-Î±-methyl testosterone are commonly used to reverse sex in tilapia. Due to its latent health and environmental hazards, attention is presently being focused on the use of alternatives, such as plant extracts called phytochemicals. This study investigated the phytochemical â€œgenisteinâ€ as a possible enzymatic aromatase inhibitor that could modulate the sex differential response in the gonad of sexually undifferentiated tilapia. Experimental diet supplemented with genistein (500mg/kg) along with a control diet were evaluated in the feeding of three days old tilapia fry (6mg-8mg) for eight weeks. Result shows that the presence of dietary genistein did not have any significance positive effect on the weight gain, SGR (%) and survival (%), although higher number of males were produced in the genistein fed fish but the phenotypic sex ratio was not significantly different (p>0.05) from the control.