Quantifying bycatch risk factors for the Chinese distant water fishery

Meng Xia; Tom Carruthers; Richard KindongLibin DaiZhe GengXiaojie DaiFeng Wu

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Quantifying bycatch risk factors for the Chinese distant water fishery

机译：Quantifying bycatch risk factors for the Chinese distant water fishery

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Mitigating bycatch of non-target fish species is a commonobjective in fisheries management that may be supported by the gathering of data from fishery observer programs and quantitative analysis of bycatch risk factors. We build three GLM models based on Chinese tuna longline fishery observer data in terms of analysis of total bycatch rate (TB rate), total bycatch ratio (TB ratio), and species-specific bycatch rate, respectively. The positive log-linearmodels assumed a Gaussian observation error model and a linear combination of categorical independent variables, including area, year, month, depth, and bycatch species. Results show that distributions of TB rate and TB ratio followed different trends and a latitudinal decrease was observed from both the northern and southern hemisphere of the equator. Comprehensively, the Pacific is a better place to fish compared to the Indian and Atlantic Oceans in terms of relatively lower TB rate and TB ratio. Fishing in open oceans can somehow avoid a high TB ratio than fishing in coastal waters. As a result, we recommend area 2SW,2SE,2NW,14SW,14SE, and 14NW as appropriate fishing ground for Albacore (Thunnus alalunga) while area 11N,11S,18SW, and 18SE to be appropriate fishing ground for fishing bigeye tuna (Thunnus obesus). Setting fishing gears deeper than 500m would also help to get a low TB rate and TB ratio.

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《ICES journal of marine science: International Council for the Exploration of the Sea journal of marine science》 |2023年第3期|507-517|共11页
作者
Meng Xia; Tom Carruthers; Richard KindongLibin DaiZhe GengXiaojie DaiFeng Wu;
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作者单位

College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;

Institute for the Oceans and Fisheries, University of British Columbia, Vancover, BC V6T 1Z4, Canada;

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正文语种英语
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bycatch; Chinese tuna fishery; high seas fishing; observer program; pelagic longline;

Quantifying bycatch risk factors for the Chinese distant water fishery

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