In the undifferentiated gonads, the number of germ cells in females is not significantly different from males. This study explores the pattern of spotted scat early gonad development by morphological and molecular means. Meanwhile, information on gonad development and gene expression patterns in the early gonads is unknown. The spotted scat ( Scatophagus argus) is an economically important marine fish with an XX/XY sex-determining system and exhibits sexual growth dimorphism in favor of females. Knowledge of the gonad development process is vital in studies on fish sex determination and differentiation. In vertebrate the development of gonad into testis or ovary requires the combined effect of genes and hormones to trigger differentiation from a bipotential gonadal primordium.
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