Sinlapachai Senarat, Jes Kettratad, and Wannee Jiraungkoorskul

pp. 569 - 573

Abstract

An understanding of atretic follicles in wild population is required before investigating the reproductive cycle and
spawning season but these follicles have never been reported on adult short mackerel Rastrelliger brachysoma (Bleeker,
1851). Histology and histochemistry were used to classify the stage of atretic follicles in R. brachysoma, obtained from the
Upper Gulf of Thailand. Microscopically, it was clear that under atretic processing this species could be successively divided
into two phases: atretic follicle during previtellogenic and vitellogenic stages, in which the latter was also classified into five
steps (I, II, III, IV, and V). Histochemically the cortical alveoli, yolk granules and basement membrane were observed and
discussed in this study.