Juvenile females of the same age were sampled for morphological and histological analysis. A, The ovaries from control fish (fshb+/+ and fshb+/−) with PV follicles (arrow). B, The ovaries of mutant fish (fshb−/−) with PG follicles only. The age, genotype, SL, BW, and stage of follicles in the ovary are shown in the table (C).