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为了解热带大西洋延绳钓大眼金枪鱼适宜渔获水温的等温线时空分布,分析大眼金枪鱼适宜的垂直和水平空间分布范围,采用Argo浮标剖面温度数据,运用Kriging方法重构热带大西洋9、12、13和15℃月平均等温线场,网格化计算了12、13℃等温线深度值和温跃层下界深度差,并结合大西洋金枪鱼国际养护委员会(ICCAT)大眼金枪鱼延绳钓渔业数据,绘制了12、13℃等温线深度与月平均单位捕捞努力渔获量(CPUE)的空间叠加图,用于分析大眼金枪鱼中心渔场CPUE时空分布和高渔获率的水温等值线时空分布的关系.结果表明:热带大西洋大眼金枪鱼中心渔场延绳钓高渔获率的水层垂直分布在温跃层下界以下区域,在表层以下150~450 m深度.在水平空间上,12℃等温线高值CPUE出现的深度值大多小于300m,集中分布在190~260 m,深度值超过400 m几乎没有CPUE值.大眼金枪鱼水平空间分布受12℃等温线影响.13℃等温线高值CPUE出现的深度值大多小于250 m,集中分布在150~230 m,深度值超过300 m几乎没有渔获.采用频次分析和经验累积分布函数计算其适宜次表层环境因子分布:12℃等温线190~260 m;13℃等温线160~240 m;12℃深度差-10~100m;13℃深度差-40~60 m.文章初步得出热带大西洋大眼金枪鱼中心渔场适宜的水平、垂直深度值分布区间,结果可以辅助寻找中心渔场位置,同时指导投钩深度,为大西洋大眼金枪鱼实际生产作业和资源管理提供理论支持.
In order to understand the spatial and temporal distribution of appropriate temperature of isobaric tuna in tropical oceans, the suitable vertical and horizontal spatial distributions of the bigeye tuna were analyzed. Based on the Argo buoy profile temperature data and Kriging method, the tropical Atlantic 9,12 , 13 and 15 ℃ monthly mean isotherm fields, the difference between the depth of 12 and 13 ℃ isotherms and the depth of the lower thermocline were calculated by gridding. Combined with the data of longline fishery of ICAAT, , Plotted the spatial overlay of the 12,13 ℃ isotherm depth and monthly average fishing effort catches (CPUE) for the temporal and spatial distribution of water temperature contours of CPUE spatiotemporal distribution and high catch rate The results showed that the water level of longline fishing catchment in the fishing ground of tropical Atlantic octopus was vertically distributed in the area below the lower bound of the thermocline with a depth of 150 ~ 450 m below the surface layer. In horizontal space, the 12 ℃ isothermal Depth values of line height CPUE are mostly less than 300m, concentrated in the range of 190-260m, and there is almost no CPUE value for the depth value of more than 400m. The horizontal spatial distribution of the big-eye tuna is affected by the isothermal temperature of 12 ℃ The depth of 13 ℃ isotherm CPUE was mostly less than 250 m, concentrated in 150-230 m, and almost no depth was observed when the depth was over 300 m.The frequency of analysis and empirical cumulative distribution function were used to calculate the suitable subsurface environment Factor distribution: 190 ~ 260 m at 12 ℃, 160 ~ 240 m at 13 ℃, 10 ~ 100 m at depth of 12 ℃, and 40 ~ 60 m at depth of 13 ℃. The results show that the tropical Atlantic octopus tuna center The suitable horizontal and vertical distribution of the depth of the fishing ground can help to find the location of the central fishing ground and guide the depth of the hook to provide theoretical support for the actual production and resource management of the Atlantic bass tuna.