Figs 5-10 in Ovarian development and spawning of Macrobrachium amazonicum (Crustacea, Decapoda)

Figs 5-10. Photomicrographs of germ cells of the ovary of Macrobrachium amazonicum (Heller, 1862) at different stages of development, captured in the Cachoeira II reservoir between November 2014 and August 2017: 5, Oogonia: nucleus (NU) and nucleolus (NE). The granulations within the nucleus characteriZe the chromatin; 6, Previtellogenic oocyte: cytoplasm (CY) and two nucleoli (NE) within the nucleus; 7, Initial vitellogenic oocyte: formation of cytoplasmic vesicle (CV) and spherical follicular cells (FC) around the cell; 8, Advanced vitellogenic oocyte: cytoplasmic vesicles (CV) and yolk granules (YG); 9, Mature oocyte: follicular cells (FC) forming a cord-like coating around the oocyte, with center nucleus (NU); 10, Atretic oocyte: showing cellular disorganiZation. Color: HematoXylin-Eosin (5, 6, 9, 10); Gomori trichrome (7, 8).