Ovarian histology of Trypauchen vagina (Bloch & Schneider, 1801) during breeding season from Samut Songkhram Province

Abstract

Preliminary study of the ovarian histology of Trypauchen vagina (Bloch & Schneider, 1801) during its breeding season was observed before entering to study the ultrastructure and reproductive cycle for further studies. All fish were collected from the Upper Gulf of Thailand, Samut Songkhram Province. The present study revealed that the ovarian structure of this fish was surrounded by tunica albuginea. Within the ovarian tissue, it consists of two parts: germinal and stromal compartments. The stromal compartments contained differential stage of oocytes, which were divided into two phases i.e. primary oocyte growth (chromatin nucleolus, perinucleolar and lipid droplet and cortical alveolar stages) and secondary oocyte growth (early and late vitellogenic stages).