Abstract
This study aimed to evaluate the effect of vitamin E supplementation in the morphometry and gonadal development of Nile tilapia (Oreochromis niloticus). Considering the weight of the gonad, gonadossomatic index, testes thickness and lumen percentage, significant differences were observed for the treatment with 150 mg/kg of vitamin E. There were observed significant differences for percentage of germinative epithelium to 150 mg/kg of vitamin E and for percentage of Leydig cells in treatment with 50 mg/kg of vitamin E. The percentage of blood vessels was higher in both treatments with 50 and 150 mg. The vitamin E requirement for gonadal development of tilapia is 150 mg/kg.
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