Reproductive stages evaluated in this study.

<p>Microphotographs of the reproductive stages evaluated in this study: inactive stage at pre-gametogenesis (A) and after spawning (B); early maturation of the ovary (C) and testis part (D); Late maturation of the ovary (E) and testis part (F). Tissues or cell types are denoted as follows: connective tissue (ct), empty acinus (ea), muscle fibers (m), oogonia (ovog), previtellogenic oocytes (previt), primary vitellogenic oocytes (vit-I),secondary vitellogenic oocytes (vit-II), spermatogonia (spg), spermatocytes (spc), spermatid (spm), spermatozoa (spz).