Chub mackerel (Scomberjaponicus) is a primary pelagic fish resource offChina waters.Growth is one of the most important factors that determine the dynamics of fish populations and influences the sustainable catch weight that can be taken from a stock.We studied the age and growth of chub mackerel in the East China Sea and Yellow Sea.Age was determined by interpreting and counting growth rings on the sagitta otoliths of 246 adult individuals caught in the commercial purse seine fleet during the period from November 2006 to January 2007,and 150 juveniles from bottom trawl survey in the spawning ground in May 2006.The difference between the assumed birth date of 1st April and date of capture was used to revise the age which determined by counting the number of complete translucent rings.The parameters of typical growth models,von Bertalanffy,logistic and Gompertz were estimated using the maximum likelihood method.Based on the Akalke Information Criterion (AIC),von Bertalnaffy growth function was considered as most appropriate model.The size-at-age and size-at-maturity values were found to decrease greatly compared with historical values,perhaps suggesting this population is overfished.