CPUE standardization of Pacific saury (Cololabis saira) for the Taiwanese stick-held dip net fishery in the Northwestern Pacific Ocean

The catch and effort data of Pacific saury for the Taiwanese stick-held dip net fishery in the Northwestern Pacific Ocean were collected from 2001 - 2016. Two alternative approaches, generalized linear models (GLMs) and generalized additive models (GAMs), were applied to standardize the catch per unit effort (CPUE) of Pacific saury, with an assumption of lognormal error distribution. All of the 5 main explanatory variables and most of the interaction terms used in the modeling analyses were statistically significant. The results derived from both approaches, GLMs and GAMs, were almost identical. Standardized CPUE of Pacific saury for the Taiwanese stick-held dip net fishery in the Northwestern Pacific Ocean showed a slight increase from 2001 - 2010, followed by a sharp increase through to 2014, and then a decline until 2016.