Abstract: Monthly data of length composition for Tenualosa ilisha landed between April 2006 to March 2007 in north of Persian Gulf were used to estimate the growth, mortality and exploitation parameters of the stock. Maximum total length and weight were 43 cm and 949 g, respectively. Nonlinear least square fitting provided a complete set of von Bertalanffy growth estimate: L8 = 42.74 cm total length, K= 0.77 and t0 = -0.21 years-1. The estimated value of total mortality based on length converted catch curve using these growth parameters is Z= 2.55 years-1. Natural mortality based on growth parameters and mean environmental temperature (T = 23 C) is 0.75 years-1. Fishing mortality computed for T. ilisha was 1.8 years-1. The exploitation rate (E) was 1.8 years-1. The higher value of E indicates over fishing during in period. Population dynamics and stock assessment of Tenualosa ilisha in Iran waters was studied using the length-frequency based analysis of FiSAT software to evaluate the growth parameters, mortality rates, exploitation rate and Maximum Sustainable Yield (MSY). The study showed that T. ilisha is in over fishing pressure.