Evaluation of sustainable utilization of fishery resources in the Eastern Central Atlantic and Southeast Atlantic based on grey correlation analysis
The Eastern Central Atlantic and Southeast Atlantic are rich in fishery resources.Evaluating the status of the sustainable utilization of fishery resources is beneficial to achieving the sustainable development and exploitation of fishery resources.Based on catch data obtained from FAO in the Eastern Central Atlantic and Southeast Atlantic from 1980 to 2019,the grey correlation method was used to evaluate the sustainable utilization level of fishery resources in these areas.The results showed that from 1980 to 2019,an opposite trend was presented in catches of the Eastern Central Atlantic and the Southeast Atlantic.The catch in the Eastern Central Atlantic showed an increasing trend with fluctuations,while the catch in the Southeast Atlantic presented a steady declining trend,and the cumulative catch in the former was 2.2 times that of the latter.Pelagic fish species were the most important targeted species in these fishing areas,followed by demersal fish species.The catches of pelagic fish species accounted for 72.03％and 67.31％of the total catches,respectively.The top 20 fish species in the two fishing areas were pelagic fish species.The top 5 fish species in the Eastern Central Atlantic were Sardina pilchardus,Trachurs sp.,Sardinella aurita,Sardinellas nei and Scomber colias;but in the Southeast Atlantic,the top 5 fish species were Trachurus capensis,Merluccius capensis,Engraulis capensis,Sardinops sp.and Sardinellas sp..The results of grey correlation analysis showed that the grey correlation degrees based on seven categories and top 20 fish species of the Eastern Central Atlantic and the Southeast Atlantic were above 0.7,belonging to the state of high-intensity exploitation or above.In the Eastern Central Atlantic,the grey correlation degree based on seven categories were all in the range of 0.7-0.9,and the average was 0.80.The grey correlation degree based on top 20 fish species was higher than 0.9 around 2010,and the average was 0.80.The grey correlation degree based on seven categories and top 20 fish species showed a fluctuating growth trend over time,indicating that the fishing area was approaching or in the state of full exploitation.The average grey correlation degree based on seven categories and top 20 fish species in the Southeast Atlantic was 0.84 and 0.88,respectively.The grey correlation degrees were higher than 0.9 in many years,but mainly in the 1980s and 1990s,implying that the fishery resources in this fishing area at the early stage were close to full exploitation.And the grey correlation degree showed a trend of fluctuation and decline over time.The exploitation of marine fish species in the Eastern Central Atlantic is reaching the limit and there is very limited room for further increase of catch.After full exploitation and strict management,the fishery resources in the Southeast Atlantic have improved slightly,however,it is still in the state of high-intensity exploitation,and the increase of catch is limited in the future.This study suggests strengthening conservation of resources in these two fishing areas,severely cracking down on illegal fishing behaviors,strengthening fishery resources investigation,and dynamically grasping the changes of fishery resources.The findings can provide reference for the scientific management,development and utilization of fishery resources in the Eastern Central Atlantic and Southeast Atlantic.
Eastern Central AtlanticSoutheast Atlanticfishery resourcessustainable utilizationgrey correlation
万方数据
维普
