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CPUE standardization of striped marlin (Tetrapterus audax) caught by Taiwanese longline fishery in the Indian Ocean for 1980 to 2010








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    CPUE standardization of striped marlin (Kajikia audax) caught by Taiwanese longline fishery in the Indian Ocean for 1995 to 2011 2013
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    This study provided a CPUE standardization of striped marlin (Kajikia audax) caught by the Taiwanese longline fishery in the Indian Ocean for time periods of 1980-2011 and 1995-2011. The delta-lognormal GLM model is adopted to perform the CPUE standardization alysis since blue marlin is caught by Taiwanese longline fleet as bycatch species and large amount of zero catches are recorded in the operatiol data sets. The results indicate that the influence of incorporating environmental effects on CP UE standardization is not significant for striped marlin in the Indian Ocean. The CPUEs in Area MONS and Coastal area revealed similar trends and they substantially decreased since 1980 although the CPUE obviously fluctuated in early years. The CPUE in Area ISSG fluctuated before 1990, substantially increased between 1990 and 1995, and sharply decreased thereafter. In recent years, CPUEs obviously increased for all three areas. The area-aggregated CPUE obviously fluctuated before 1995 and it rev ealed obvious and continuous decline trend thereafter, while it slightly increased in recent two years.
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    Correlations between environmental factors and CPUEs of blue marlin (Makaira mazara) and striped marlin (Kajikia audax) caught by Taiwanese longline fishery in the Indian Ocean 2013
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    This study investigated the correlations between environmental factors (Indian Oscillation Index, Dipole Mode Index, Southern Oscillation Index, sheer currents, amplitude of the shear current, thermocline depth, and temperature at depth of 15/55m and temperature gradient at depth of 15/55m) and nomil CPUEs of blue marlin and striped marlin caught by Taiwanese longline fishery in the Indian Ocean. The results clearly showed that there are significant cycle-patterns between CPUEs and most environm ental factors. In addition, this study also suggested the environmental factors with the time-lags for CPUE standardization alyses of blue and striped marlins in the Indian Ocean.
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