The histological study of ovarian development of grey mullet (Mugil cephalus) in Gomishan fish and shrimp rearing center

During 6 monthes (from August 2001 to January 2002) ovarian development stages were histologically studied in the rearing ponds of South Caspian Sea (Gomishan). The aim of this study was determining of hormonal inducing time for oocyte final maturing. Different stages of oocyte development (nucleus changes, oocyte diameter and forming of yolk vesicle, yolk granules and lipid droplets) were surveyed. According to the results, stage I, II, III and IV of ovary maturation occurred in July, August, September and October, respectively. From November fishes were ready for hormonal induction.