CPUE standardization of albacore (Thunnus alalunga) caught by Taiwanese large-scale longline fishery in the Indian Ocean

The cluster analysis was adopted to explore the targeting of fishing operations of vessels operating in the albacore fishing areas of the Indian Ocean. In addition, the CPUE standardizations were conducted using the regular generalized linear model (GLM) and delta-GLM for accounting for the trend in the zero catches. In general, the clustering approach was able to explicitly and clearly identify the targeting of each set. Based on the diagnostic statistics and trend of model fits, the standardized CPUE series obtained based on the regular GLM with gamma error distribution would be recommended by this study.