摘要
秘鲁外海茎柔鱼是大洋性经济鱼类,其资源丰度受环境因素变化的影响较大。研究基于2018−2021年9−12月秘鲁外海茎柔鱼的渔捞日志数据,并结合卫星遥感获取海表温度(SST)、海表盐度(SSS)、海表高度(SSH)和叶绿素a浓度(Chl a)4个环境数据,运用ArcGIS和随机森林模型分析秘鲁外海茎柔鱼资源丰度与环境因子之间的关系。研究结果表明,2018−2021年9−12月茎柔鱼渔场重心分布范围集中于13°~21°S,76°~87°W海域,9−12月渔场重心呈现西北向东南方向移动趋势。随机森林模型分析结果显示,各月环境因子对秘鲁外海茎柔鱼资源丰度和分布的影响存在一定的差异性,最适SST范围16.3~18.5℃,最适SSS范围35.1~35.4,最适SSH范围0.55~0.60 m,最适Chl a浓度范围0.18~0.46 mg/m^(3),通过随机森林模型的CPUE预测值与名义CPUE随时间变化趋势基本一致,表明随机森林模型适用于分析秘鲁外海茎柔鱼与环境因子之间的关系。本研究对了解该海域茎柔鱼资源变动规律、指导茎柔鱼生产具有重要意义。
Dosidicus gigas is an oceanic economic fish in the offshore waters of Peru,and its abundance is greatly affected by environmental factors.This study obtained the abundance of D.gigas through fishing logs from September to December in 2018−2021,combined with environmental factors,including surface temperature(SST),sea surface salinity(SSS),sea surface height(SSH)and chlorophyll a concentration(Chl a)acquired from satellite remote sensing.Random forest model and ArcGIS were applied to analyze the correlations between the abundance of D.gigas and environmental factors.Results showed that the distribution of the center of gravity of fishing ground was concentrated in the range of 13°−21°S,76°−87°W during 2018−2021,and the center of gravity shifted from northwest to the southeast from September to December.The results of random forest model analysis showed that,the impact of environmental factors on the abundance and distribution of D.gigas in the offshore waters of Peru varied among different months.The optimal SST ranged from 16.3℃to 18.5℃,The optimal SSS ranged from 35.1 to 35.4,the optimal SSH ranged from 0.55 m to 0.60 m,the optimal Chla concentration ranged from 0.18 mg/m^(3)to 0.46 mg/m^(3).The predicted CPUE values derived from the random forest model were generally consistent with the nominal CPUE distribution,indicating the suitability of the random forest model for analyzing the relationship between D.gigas and environmental factors in the offshore waters of Peru.This study is of great significance for understanding the resource dynamics of D.gigas and guiding its production.
作者
彭伟图
陈峰
李建雄
赵艺翔
董钇江
戴乾
徐汉祥
朱文斌
Peng Weitu;Chen Feng;Li Jianxiong;Zhao Yixiang;Dong Yijiang;Dai Qian;Xu Hanxiang;Zhu Wenbin(Marine and Fishery Institute of Zhejiang Ocean University,Zhoushan 316021,China;Zhejiang Marine Fisheries Research Institute/Scientific Observing and Experimental Station of Fishery Resources for Key Fishing Grounds,Ministry of Agriculture and Rural Affairs/Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resources of Zhejiang Province,Zhoushan 316021,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2024年第7期41-50,共10页
基金
国家重点研发计划项目(2019YFD0901505)
浙江省重点研发计划项目(2018C02026)
2022−2023浙江省远洋渔业资源常规检测(2023HZ024)。
关键词
茎柔鱼
随机森林模型
资源丰度
环境因子
Dosidicus gigas
random forest model
abundance
environmental factors