| 英文摘要 |
We will collect and compile the fishery data and the catch information of billfishes for the Taiwanese distant-water tuna longline fleets in the Pacific and Atlantic Oceans in this study. The catch-rates of the Pacific blue marlin, North Pacific striped marlin, and Atlantic white marlin will be standardized using generalized linear models to provide basic input data for stock assessments. Moreover, we will collect fishery data for the main fleets, such as Japan and USA that use these two resources, Pacific blue marlin and North Pacific striped marlin. An age-structured population dynamics model will be developed with life history information and biological parameters incorporated, and then applied to Pacific blue marlin and North Pacific striped marlin to assess the stock status and provide scientific support for fishery management, in order to achieve the goal of sustainable use of the resources. |