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Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies
Fisheries Oceanography ( IF 2.6 ) Pub Date : 2015-10-07 , DOI: 10.1111/fog.12125
Ango C Hsu 1 , Andre M Boustany 2 , Jason J Roberts 2 , Jui-Han Chang 3 , Patrick N Halpin 2
Affiliation  

Abstract To analyze the effects of mesoscale eddies, sea surface temperature (SST), and gear configuration on the catch of Atlantic bluefin (Thunnus thynnus), yellowfin (Thunnus albacares), and bigeye tuna (Thunnus obesus) and swordfish (Xiphias gladius) in the U.S. northwest Atlantic longline fishery, we constructed multivariate statistical models relating these variables to the catch of the four species in 62 121 longline hauls made between 1993 and 2005. During the same 13‐year period, 103 anticyclonic eddies and 269 cyclonic eddies were detected by our algorithm in the region 30–55°N, 30–80°W. Our results show that tuna and swordfish catches were associated with different eddy structures. Bluefin tuna catch was highest in anticyclonic eddies whereas yellowfin and bigeye tuna catches were highest in cyclonic eddies. Swordfish catch was found preferentially in regions outside of eddies. Our study confirms that the common practice of targeting tuna with day sets and swordfish with night sets is effective. In addition, bluefin tuna and swordfish catches responded to most of the variables we tested in the opposite directions. Bluefin tuna catch was negatively correlated with longitude and the number of light sticks used whereas swordfish catch was positively correlated with these two variables. We argue that overfishing of bluefin tuna can be alleviated and that swordfish can be targeted more efficiently by avoiding fishing in anticyclonic eddies and in near‐shore waters and using more light sticks and fishing at night in our study area, although further studies are needed to propose a solid oceanography‐based management plan for catch selection.

中文翻译:

与中尺度涡流相关的美国西北部大西洋延绳钓渔业捕获的金枪鱼和箭鱼

摘要 分析中尺度涡流、海面温度 (SST) 和渔具配置对大西洋蓝鳍金枪鱼 (Thunnus thynnus)、黄鳍金枪鱼 (Thunnus albacares)、大眼金枪鱼 (Thunnus obesus) 和旗鱼 (Xiphias Gladius) 捕获量的影响。在美国西北大西洋延绳钓渔业中,我们构建了多元统计模型,将这些变量与 1993 年至 2005 年间进行的 62 121 次延绳钓捕捞中的四个物种的渔获量相关联。在同一 13 年期间,检测到 103 个反气旋涡旋和 269 个气旋涡旋通过我们的算法在 30-55°N, 30-80°W 区域。我们的结果表明,金枪鱼和旗鱼的捕获与不同的涡流结构有关。蓝鳍金枪鱼捕获量在反气旋涡流中最高,而黄鳍金枪鱼和大眼金枪鱼捕获量在气旋涡流中最高。在涡流以外的区域优先发现箭鱼。我们的研究证实,以金枪鱼为目标的日间钓组和旗鱼以夜间钓组为目标的常见做法是有效的。此外,蓝鳍金枪鱼和旗鱼捕获量对我们测试的大多数变量的反应方向相反。蓝鳍金枪鱼的捕获量与经度和使用的荧光棒数量呈负相关,而箭鱼的捕获量与这两个变量呈正相关。我们认为,通过避免在反气旋涡旋和近岸水域捕鱼,并在我们的研究区使用更多的荧光棒和夜间捕鱼,可以减轻蓝鳍金枪鱼的过度捕捞,并且可以更有效地瞄准箭鱼,尽管需要进一步研究提出一个基于海洋学的可靠的渔获选择管理计划。
更新日期:2015-10-07
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