|Title:||Updated standardized CPUE and catch estimation of the blue shark caught by the Taiwanese large scale tuna longline fishery in the North Pacific Ocean||Authors:||Kwang-Ming Liu
|Issue Date:||Nov-2021||Publisher:||ISC shark working group.||Source:||ISC/21/SHARK WG-2||Abstract:||
In the present study, the blue shark catch and effort data from observers’ records of the
Taiwanese large-scale longline fishing vessels operating in the North Pacific Ocean
during the period of 2004-2018 were analyzed. The catch per unit effort (CPUE) of blue
shark, as the number of fish caught per 1,000 hooks, was standardized using delta
lognormal approach. The standardized CPUE of blue shark showed a stable increasing
trend. The results suggested that the blue shark stock in the North Pacific Ocean seems
at the level of optimum utilization. The blue shark by-catch was estimated using the
area-specific nominal CPUE multiplying the fishing effort and accounting for the
coverage rate. Estimated blue shark by-catch in weight ranged from 1 ton in 1973 to
1,247 tons in 2020.
ISC/21/SHARK WG-2/14. Web-meeting.
|Appears in Collections:||海洋事務與資源管理研究所|
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