Standardization of CPUE data of Pacific saury (Cololabis saira) caught by the Chinese stick-held dip net fishery

China’s Pacific saury fishery began in 2003. Most of the Pacific saury catch is harvested by the stick-held dip net fishery. In this paper, we standardized catch per unit fishing effort (CPUE) using Generalized linear model (GLM) and generalized additive model (GAM). Four groups of independent variables were considered in the standardization: spatial variables (latitude and longitude), temporal variables (year and month), vessel length and environmental variables (SST, SSTG and SSH). Log-CPUE was treated as the dependent variable and its error was assumed to follow normal distribution in each model. The model selections of GLM and GAM were based on the BIC. From the results, Higher Spearman’s correlation and lower mean squared error were observed by GAM. Besides, the standardized CPUE trend of GAM model is similar with that of nominal CPUE. Therefore, we prefer to choose the best GAM model to estimated standardized CPUE of Pacific saury.