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首页> 外文期刊>ICES Journal of Marine Science >Origin of Atlantic bluefin tuna (Thunnus thynnus) in the Bay of Biscay
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Origin of Atlantic bluefin tuna (Thunnus thynnus) in the Bay of Biscay

机译：比斯开湾的大西洋蓝鳍金枪鱼（Thunnus thynnus）的起源

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摘要

We used carbon and oxygen isotope ratios (delta C-13 and delta O-18) in otoliths as a tool for identifying the nursery origin of Atlantic bluefin tuna (Thunnus thynnus) caught in the eastern North Atlantic Ocean (Bay of Biscay). Juvenile and adult bluefin tuna were collected over three consecutive years (2009-2011) using the regional bait boat fleet. Otolith delta C-13 and delta O-18 values of bluefin tuna were measured by mass spectrometry, and values were compared with a reference sample of yearling bluefin tuna from eastern (Mediterranean Sea) and western (Gulf of Mexico) nurseries to determine nursery origin. Maximum likelihood estimates based on otolith delta C-13 and delta O-18 values indicated that the overall contribution of western migrants to the Bay of Biscay fishery was <1% and varied over the years assessed. A small number of potential western migrants (2.7%) was detected in 2009, and most of these fish appear members of the abundant 2002 and 2003 year classes. In contrast, the Bay of Biscay fishery was composed exclusively (100%) of eastern origin bluefin tuna in 2010 and 2011, suggesting that this fishery is supported almost exclusively by the eastern spawning area but transatlantic western population may contribute to this fishery in a few years.
机译：我们使用耳石中的碳和氧同位素比率（δC-13和δO-18）作为确定北大西洋东部（比斯开湾）捕获的大西洋蓝鳍金枪鱼（Thunnus thynnus）苗圃起源的工具。连续三年（2009-2011年）使用区域诱饵船队收集了幼年和成年蓝鳍金枪鱼。通过质谱法测量了蓝鳍金枪鱼的耳石的C-13和O-18δ值，并将其与来自东部（地中海）和西部（墨西哥湾）苗圃的一岁蓝鳍金枪鱼的参考样品进行比较，以确定苗圃的起源。基于耳石δC-13和δO-18值的最大似然估计表明，西方移民对比斯开湾渔业的总体贡献小于1％，并且在所评估的年份中有所变化。 2009年发现了少量潜在的西方移民（2.7％），这些鱼大多数都属于丰富的2002年和2003年类。相比之下，2010年和2011年，比斯开湾渔业仅占东部起源蓝鳍金枪鱼的100％，这表明该渔业几乎完全由东部产卵区提供支持，但跨大西洋的西部人口可能在少数几个方面对该渔业有所贡献年份。

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