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Journal of Taiwan Fisheries Research
Northern Atlantic Albacore Standardized Catch per Unit Effort Trends Derived from the Catch Statistics of the Taiwanese Longline Fishery from 1968 to 2003
- Date：2006-06-30
- Volume：14
- No：1
- Page：29-36
- Auther：Liang-Kang Lee, Chi-Lun Wu and Shean-Ya Yeh
Trends of the catch per unit effort (CPUE) of northern Atlantic albacore (Thunnus alalunga) data from the Taiwanese longline fishery were standardized using a generalized linear model (GLM) for the period 1968 to 2003. To construct a GLM, factors of year, quarter, area, and catch level of bigeye tuna (T. obesus) were determined and used. Three sub-areas in the North Atlantic defined by Wu et al. (2006) were adopted for the standardization process. The area factor was the most important source of variability, which indicates that a proper aggregation of sub-areas is essential for obtaining a better abundance index. The standardized CPUE trend thus obtained showed (1) a rapid decrease after 1968 to a leveling off in 1993; (2) a sharp decline after 1993 to a nadir in 2000; and (3) a rising trend in the most recent few years.