Standardization of albacore CPUE by Japanese longline fishery in the Indian Ocean

Standardization of albacore CPUE by Japanese longline fishery in the Indian Ocean was conducted using the Generalized Linear Model (GLM) with log-normal error structure (LN model). Operational level catch and effort data as well as environmental factor (sea surface temperature) were used for standardization. Area definition is the same as that for longline joint CPUE. All CPUEs sharply declined in the early period (until around 1970). CPUE in the north area was comparatively constant after that. CPUE in the south area increased after early 2000s. Some difference of CPUE trend was observed between the present study and CPUE with ‘new’ method (with cluster analysis and vessel effect).