AN ULTRASTRUCTURAL STUDY OF THE EARLY OOGENESIS IN STRIPED MULLET, MUGIL CEPHALUS

Ultrastructural characteristics of oogonia and primary oocyte in the synaptonemal complexes, pachytene, diplotene and dictyate stages of the first meiotic prophase of striped mullet in the early oogenesis were observed hr using transmission electron microscopy. Two homologous chromosomes pair within the germinal vesicle(GV)and recombination nodules occurred at the central region of synaptonemal complex during synaptonemal complex stage. The distribution and number of different types of nucleolus-like bodies and related mitochondria in the cytoplasm of oocyte might differentiate each stage of early oogenesis in striped mullet. In addition, we observed for the first time that there was an irregular cell close to the theca cell and we guessed secretory mature inhibiting pep-tide.