Table 1 Summary of the RNA-Seq data sets and the mapping ratios for all sample groups. Note: The sample names represent the different gonad development stages when the samples were collected. BG: before gonad differentiation; MG: male gonad differentiation; MGC: male gonad differentiation control; FG: female gonad differentiation; FGC: female gonad differentiation control; MAG: male after gonad differentiation; FAG: female after gonad differentiation