This study has been conducted to find out fecundity of rainbow trout raised at Gip Research station of Fisheries School, Firat University. Thirty four fully matured female trouts of three and lour years of age were used. Estimates of ova were made both volumetrically, gravimetrically and by actual count. The calculation of egg number per female fish, per kilogram and cubic centimeter of eggs per kilogram of fish were made. Eggs didmeter were also measured. . The mean number of eggs per female of threeyears old was 2988, for four ,)'ear old was 3228. Number of eggs per kilogram ~ffish were 3926 for three years old, 2092 for four years old group. Relative fecundity, that is the number number of eggs per kilogram of body weight of the female, was 3009 eggs on the overall average. The relative fecundity did not markedly change in relation to body lengtk. Diameter if matured eggs varied between 4.1 and 5.1 mm. in three years of age and 4.7-5.2 mm. in four years if age being positively correlated with the body lengtk if female.