Abstract
The influence of testosterone propionate on gonad differentiation in Tilapia mossambica, Tilapia heudeloti, and Cichlasoma biocellatum was tested. Juvenile sexually undifferentiated animals were kept in water with 0.5 mg of testosterone propionate per liter. It became evident that the hormone treatment caused a strong feminization of the gonads in all these species, whereas spermatogenesis was depressed. Methyl testosterone (0.5 mg/1) also caused feminization but was accompanied by severe inhibition of ovarian development. In juvenile Tilapia heudeloti male secondary sex characters were induced following treatment with testosterone propionate; however, the gonads were feminized. In juvenile Hemihaplochromis multicolor male secondary sex characters were evoked precociously by treatment with 11-ketotestosterone, but this hormone did not change gonad differentiation.
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