Preliminary stock assessment of Indian Ocean albacore based on ASPIC and consideration on the specification of joint longline CPUE

Preliminary analysis of Indian Ocean albacore was conducted based on ASPIC. The objective is to see the results based on each CPUE including CPUE fit. Also, available CPUE indices were reviewed and examined. The trend of CPUE differed among fleets. Results of ASPIC seem much more reasonable with the CPUE of Taiwanese longline. Recent increase in Japanese longline CPUE seems to be affected by the change in fish-ing strategy, and so may not be a good indicator. Therefore, it may be better to eliminate catch and effort data for Japanese longline in recent period.