The histology of the ovaries of Gerres oyena was examined to give a picture of the reproductive cycle of this species. This shows that; the development of oocytes can be divided into seven stages, chromatin-nucleolus (oogonia), early perinucleolus, late perinucleolus, vacuolization, primary yolk, secondary yolk and ripe stages. Also
the maturation of the ovary is divided into eight stages, immature, developing, maturing, mature, ripe, spawning, spent and developing recovery stages. In this species the spawning season was found to be long and extending from June to early September. The spawning habit of Gerres oyena was found to be fractional spawning.