The aim of this study was to investigate the age, growth and reproduction of C. c. gracilis in Shirud River estuary from June 2011 to July 2012. A total of 157 specimens of C. c. gracilis were collected using a throw seine, 8mm mesh. Age determination was done by means of scales. The length range was measured as 85.5-232 mm. Sex ratio was 1:2.74 which was significant (P<0.05). The age range was 0-2 years for males and 0-4 years for females. Also, the age of 2 was group dominant. The Von-Bertalanffy equation coefficients were L&infin=31.3 mm, K=0.2/year, t0=-0.4 years. Length-weight relationship was isometric. The total absolute fertility was determined 3562.56±1546.81 and had significance and correlation with the total length, and body weight. The range of egg diameter is 0.3-2.3mm. The gonad development peak was determined in March and April. The Growth parameters of C. c. gracilis are similar to the specimens of other streams Gorganrood basin