Figure 5.

Unrestricted lobular testis of Oreochromis mossambicus. (A). Longitudinal section of the testis, from the periphery (P) to the efferent ducts (Ed). At the early season of spermatogenesis, there are numerous cysts with germinal cells in different stages of development at the periphery of the testis, but the lobular lumen (L) contains, until now, few spermatozoa (Sz). Interstitial tissue (It) between the lobules. (B-D). Testicular lobules containing spermatogonia (Sg) near the lobular wall, and cysts with primary spermatocytes (1Sc), early spermatids (eSt) and late spermatids (lSt). The interstitial tissue (It) contains capillaries. (A): Metanil-yellow-PAS-Hematoxylin; (B-D): Hematoxylin-eosin. (A): Bar = 100 μm, (B-D): Bar = 20 μm.