Fig. 1

The histology of gonadal samples obtained from a representative sex changing ricefield eel (S7) through biopsy. A, the gonad at female stage. B, the gonad at the early intersexual stage. C, the gonad at the mid-intersexual stage. D, the gonad at the late intersexual stage. A1 and B1 are higher magnification of the black-line boxed areas in A and B, respectively. The insets within C and D are higher magnification of the corresponding boxed areas. F, female; EI, early intersex; MI, mid-intersex; LI, late intersex; GL, gonadal lamellae; PG, primary growth stage oocyte; EVO, early vitellogenic oocyte; VO, vitellogenic oocyte; DO, degraded oocyte; SPG, spermatogonia; SPC, spermatocyte; ST, spermatid. Scale bar = 100 µm