Fishery and size data by sex of 28,110 blue sharks (Prionace glauca) from 2162 longline sets documented by observers on board 204 fishery trips from the industrial fleet based in Ensenada, Mexico during 2006–2016, were used to conduct a spatial–temporal analysis of the catch-per-unit-effort (CPUE) and its relationship with climate indices along the west coast of the Baja California Peninsula. Catch length analysis by maturity groups indicated catches were composed mainly by juvenile females (58–199 cm TL) and males (60–179 cm TL). Relationships of seasonal CPUE with sea surface temperature (SST) and Chlorophyll-a (Chl) were analyzed determining aggregations were in areas characterized by oceanographic physical processes. From the exploratory analysis of annual correlations of climate indices with CPUE, the local climate SanDiAs Index explained most variation in CPUE. A generalized additive model (GAM) with 13 predictor variables was applied to gain insight on their relationship with the total CPUE by size and sex groups. The model explained 50.5% of the total blue shark CPUE and 65.5% for juvenile females. The GAM results revealed blue shark CPUE is influenced by five relevant factors: SST, NPGO, year, latitude with distance to coast and quarter interactions, and hooks set. There is a trend to increase or decrease of CPUE when compared with the delay of NEI and SanDiAs indices in more than 1 year. Local and regional climate indices can be successful tools for forecasting blue shark catches in the Northwestern Mexican Pacific.

中文翻译：

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与墨西哥下加利福尼亚半岛西海岸捕捞的蓝鲨 (Prionace glauca) 的海洋-气候相互作用

28,110 条蓝鲨 ( Prionace glauca ) 的渔业和大小数据（按性别划分）) 从 2006 年至 2016 年期间，来自墨西哥恩塞纳达的工业船队的 204 次渔业旅行中的观察员记录的 2162 组延绳钓组，用于对单位努力渔获量 (CPUE) 及其与下加利福尼亚半岛西海岸气候指数的关系。成熟组的捕获长度分析表明捕获主要由幼年雌性（58-199 cm TL）和雄性（60-179 cm TL）组成。分析了季节性 CPUE 与海面温度 (SST) 和叶绿素-a (Chl) 的关系，确定聚集在以海洋物理过程为特征的区域。通过对气候指数与 CPUE 的年度相关性的探索性分析，当地气候 SanDiAs 指数解释了 CPUE 的大部分变化。应用具有 13 个预测变量的广义加法模型 (GAM) 来了解它们与按大小和性别组划分的总 CPUE 的关系。该模型解释了总蓝鲨 CPUE 的 50.5% 和幼年雌性的 65.5%。GAM 结果显示，蓝鲨 CPUE 受五个相关因素的影响：SST、NPGO、年份、纬度以及与海岸和季度相互作用的距离以及钩组。与NEI和SanDiAs指数1年多的延迟相比，CPUE有上升或下降的趋势。地方和区域气候指数可以成为预测墨西哥西北部太平洋蓝鲨捕捞量的成功工具。青少年女性为 5%。GAM 结果显示，蓝鲨 CPUE 受五个相关因素的影响：SST、NPGO、年份、纬度以及与海岸和季度相互作用的距离以及钩组。与NEI和SanDiAs指数1年多的延迟相比，CPUE有上升或下降的趋势。地方和区域气候指数可以成为预测墨西哥西北部太平洋蓝鲨捕捞量的成功工具。青少年女性为 5%。GAM 结果显示，蓝鲨 CPUE 受五个相关因素的影响：SST、NPGO、年份、纬度以及与海岸和季度相互作用的距离以及钩组。与NEI和SanDiAs指数1年多的延迟相比，CPUE有上升或下降的趋势。地方和区域气候指数可以成为预测墨西哥西北部太平洋蓝鲨捕捞量的成功工具。