The Cyprinid fish Salmostoma untrahi (Day) from Bhadra reservoir near Narasimharaja pura of Chikmagalore district (Karnataka) was studied for a period two years from July 1998 to June 2000 to evaluate the Gonadosomatic index (GSI). The minimum GSI values in both male and female fishes were observed in winter (I year- 0.3621 and 0.4913; II year-0.3832 and 0.6665) while, maximum of it was recorded in monsoon season for male and female respectively (I year- 1.0300 & 3.4691; II year-0.8939 and 3.6858). Based on GSI values the fish Salmostoma untrahi has three active spawning seasons in a year.