Pop-up archival tags (n = 16) were deployed on Atlantic bluefin tuna (ABT) off the west coast of Ireland in October and November 2016 (199–246 cm curved fork length), yielding 2799 d of location data and 990 and 989 d of depth and temperature time-series data, respectively. Most daily locations (96%, n = 2651) occurred east of 45°W, the current stock management boundary for ABT. Key habitats occupied were the Bay of Biscay and the Central North Atlantic, with two migratory patterns evident: an east-west group and an eastern resident group. Five out of six tags that remained attached until July 2017 returned to the northeast Atlantic after having migrated as far as the Canary Islands, the Mediterranean Sea (MEDI) and the Central North Atlantic. Tracked bluefin tuna exhibited a diel depth-use pattern occupying shallower depths at night and deeper depths during the day. Four bluefin tuna visited known spawning grounds in the central and western MEDI, and one may have spawned, based on the recovered data showing oscillatory dives transecting the thermocline on 15 nights. These findings demonstrate the complexity of the aggregation of ABT off Ireland and, more broadly in the northeast Atlantic, highlighting the need for dedicated future research to conserve this important aggregation.

中文翻译：

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从爱尔兰西海岸的觅食场追踪大西洋蓝鳍金枪鱼

弹出式档案标签（n  = 16）于2016年10月和2016年11月在爱尔兰西海岸外的大西洋蓝鳍金枪鱼（ABT）上部署（弯叉长199-246 cm），产生2799 d的位置数据以及990和989 d分别是深度和温度时间序列数据。每日最多地点（96％，n = 2651）发生在45°W以东，这是ABT当前的库存管理边界。被占领的主要栖息地是比斯开湾和北大西洋中部，有两个明显的迁徙模式：东西向群和东方居民群。一直附着到2017年7月的六个标签中有五个在迁移到加那利群岛，地中海（MEDI）和中北大西洋后返回东北大西洋。追踪的蓝鳍金枪鱼表现出diel深度利用模式，在夜间占据较浅的深度，在白天占据较深的深度。四只蓝鳍金枪鱼访问了MEDI中部和西部的已知产卵场，其中一只可能已经产卵，这是根据恢复的数据显示，在15个晚上横摇的潜水横切了温床。