Abstract We document that Atlantic bluefin tuna (BFT) began making a comeback from 2012 onwards into Norwegian waters, after several decades of absence, in parallel with an overall increased abundance recorded for eastern BFT. This study explores the distribution, biology and ecology of BFT reestablishing in Norwegian waters. We analyzed commercial catch and bycatch data including biological data on weight, length and age of BFT from 2016–2018. Predominantly larger (overall range in catches: 120−465 kg in weight and 184−297 cm in straight fork length (SFL)) adult individuals between 6 and 14 years old have recently started to revisit Norwegian waters. Numerous recently documented BFT observations were reported in this study, and a significant increase was detected from 2012 (n = 1) to 2018 (n = 105) (p

中文翻译：

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大西洋蓝鳍金枪鱼 (Thunnus thynnus) 重返挪威水域

摘要 我们记录了大西洋蓝鳍金枪鱼 (BFT) 从 2012 年开始回归挪威水域，经过几十年的缺席，与此同时 BFT 东部记录的丰度总体增加。本研究探讨了 BFT 在挪威水域重建的分布、生物学和生态学。我们分析了商业捕捞和兼捕数据，包括 2016-2018 年 BFT 的重量、长度和年龄的生物学数据。6 至 14 岁的主要较大（总捕获量：120-465 公斤体重和 184-297 厘米直叉长度 (SFL)）成年个体最近开始重新访问挪威水域。本研究报告了许多最近记录的 BFT 观察结果，从 2012 年（n = 1）到 2018 年（n = 105）（p