Fig. 1

Histological characteristics of ovary (a and b) and testes (c and d) from 3-year-old A. schrenckii individuals. OI, ovarian lamellae; OL, ovarian lumen; PG, primary growth oocyte; BM, basement membrane; N, oocyte nucleus; Nu, oocyte nucleoli; OG, oogonia; BV, blood vessels; Lo, lobule; SG, spermatogonia; SC, Sertoli cell; The gonadal tissues were stained with hematoxylin and eosin (HE staining). Scale bar in A = 100 μm and in B, C, D = 50 μm