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| Spatial and Temporal Distribution of the Fishing Ground Gravity of Thunnus alalunga in Western and Central Pacific |
| XU Zhenqi1, WANG Jintao1,2,3,4,5, LEI Lin1,2,3,4,5, CHEN Xinjun1,2,3,4,5 |
1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
2. Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;
3. National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;
4. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;
5. Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China |
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Abstract As a highly migratory oceanic fish, Thunnus alalunga has high economic value. The research and analysis of the spatial and temporal distribution of its resources are the basis for further efficient development and utilization and improvement of operational efficiency. This paper was based on the world longline fishing data of Thunnus alalunga in the Western and Central Pacific Ocean from 2009 to 2018. Combined with the data, the monthly variation trend and spatial distribution characteristics of Thunnus alalunga resources were explored by using statistics and K-means clustering method. The results showed that the center of gravity of the fishing ground is mainly distributed in the range of E 155°—W 160° and S 15°—S 30° during 2009—2018. The Northern Hemisphere winter (from December to February of the next year) is mainly concentrated in the low latitude area of the northern hemisphere (N 0°—N 10°), the center of gravity of fishing ground shifts to the northwest, and the southern hemisphere winter (from June to August) is mainly concentrated in the low latitude area of the southern hemisphere (S 12°—S 22.5°), the center of gravity of the fishing ground shifted to the southeast. The spatial and temporal distribution of the center of gravity of the fishing ground is significantly affected by the sea surface temperature anomaly. When the SSTA is higher, the center of gravity of the fishing ground is scattered in the central sea area, and when the SSTA is relatively lower, the center of gravity of the fishing ground shifts to the southeast and northwest. The results are helpful to the sustainable development, utilization and scientific management of Thunnus alalunga in this sea area.
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Received: 27 July 2021
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