Effects of spatio-temporal and environmental factors on fishing grounds of albacore tuna Thunnus alalunga in the South Pacific Ocean based on generalized additive model
YAN Min,ZHANG Heng,WU Yu-mei,CUI Xue-sen,YANG Sheng-long
1. Key Laboratory of Fisheries Resources Remote Sensing and Information Technology Resources, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; 2. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
Abstract: The spatial-temporal profiles and marine environments related to fishing ground distribution were investigated in albacore tuna Thunnus alalunga,one of the main catch fisheries for longline fishery in South Pacific,based on the catch data of longline fishery from 2009 to 2012 and the environmental data including sea surface temperature（SST）,Chlorophyll-a concentration（Chl-a）,and sea surface height anomaly（SSHA） derived from remote sensing by a generalized additive model（GAM）.The results showed that the deviance of catch per unit effort（CPUE） was explained at a rate of 11.34% by the GAM,and that time（week） was the maximal contribution factor with contribution rate of 6.35%.The catching of albacore tuna was operated in the fishing grounds throughout the year,with significant seasonal change.There was higher CPUE from May to July than from January to March and from October to December.The peak fishing was observed from mid-May to later July,and the fishing grounds of albacore tuna in the South Pacific Ocean was mainly located in the water areas of 10°S-30°S and 162°E-174°E.In the central fishing ground,the suitable SST was ranged from 26.0 ℃ to 29.5 ℃,the suitable Chl-a was varied from 0.02 mg / m~3 to 0.05 mg / m3,and the appropriate SSHA was ranged from 0 cm to 20 cm.The stepwise GAM revealed that the relative importance of the six variables above in the fishing grounds of albacore tuna was followed by the order as： time（week） 〉 latitude 〉 SST 〉 longitude 〉 SSHA 〉 Chl-a concentration.
闫敏, 张衡, 伍玉梅, 崔雪森, 杨胜龙. 基于GAM模型研究时空及环境因子对南太平洋长鳍金枪鱼渔场的影响[J]. 大连海洋大学学报, 2015, 30(6): 681-685.
YAN Min, ZHANG Heng, WU Yu-mei, CUI Xue-sen, YANG Sheng-long. Effects of spatio-temporal and environmental factors on fishing grounds of albacore tuna Thunnus alalunga in the South Pacific Ocean based on generalized additive model. Journal of Dalian Ocean University, 2015, 30(6): 681-685.
2015, Vol. 30 
