从比斯开湾的活饵渔船上测量大西洋蓝鳍金枪鱼(Thunnus thynnus)的目标强度

IF 2.2 2区 农林科学 Q2 FISHERIES Fisheries Research Pub Date : 2024-09-04 DOI:10.1016/j.fishres.2024.107150
Guillermo Boyra , Jon Uranga , Nicolas Goñi , Iann Godard , Bea Sobradillo
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引用次数: 0

摘要

尽管大西洋蓝鳍金枪鱼(ABFT)在全球范围内具有重要的经济意义和密集的开发活动,但在使用最常用的 38 千赫频率声学方法估算其丰度时,却缺乏必要的基本参数。本文介绍了使用 38 千赫分波束回声测深仪在比斯开湾的一艘诱饵船上对大西洋蓝鳍金枪鱼背侧目标强度(TS;dB re 1 m2)的现场测量结果。根据九次活饵捕鱼作业的数据,拟合了 TS 与叉长 (FL; cm) 之间的线性回归模型。为减少重复计数可能造成的偏差,对 TS 测量值进行了鱼群跟踪过滤。每组模态 TS 值范围从 -38 到 -17 dB,模态金枪鱼体叉长度在 55 到 150 cm 之间,即包括 ABFT 幼鱼和成鱼在内的相当大的尺寸范围。线性回归的结果是,TS-长度关系的斜率为 36.9 dB,截距为 -101.6 dB,决定系数 R2 = 87 %。当 TS-长度关系的斜率强制为 20 时,截距(b20)为-68.5 dB(R2 = 79.5 %)。这项工作中提出的声学参数是比斯开湾和国外传统上使用的依赖渔业的 ABFT 丰度指数不确定性的关键。
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Target strength measurements of Atlantic bluefin tuna (Thunnus thynnus) from a live-bait fishing vessel in the Bay of Biscay

Despite its significant economic importance and intensive exploitation worldwide, the Atlantic bluefin tuna (ABFT) lacks the essential parameters required to estimate its abundance using acoustic methods at the most used 38 kHz frequency. This paper presents in situ measurements of target strength (TS; dB re 1 m2) for ABFT in dorsal aspect obtained from a baitboat in the Bay of Biscay, using a 38-kHz split-beam echosounder. A linear regression model was fit between TS and fork length (FL; cm) based on data from nine live-bait fishing operations. To mitigate potential bias due to double counting, TS measurements were filtered with fish tracking. The range of modal TS values per set was from −38 to −17 dB for modal tuna body fork lengths between 55 and 150 cm, that is, a rather thorough range of sizes including ABFT juveniles and adults. The linear regression resulted in a TS-length relationship characterised by a slope of 36.9 dB and an intercept of −101.6 dB, with a coefficient of determination R2 = 87 %. When the slope of the TS-length relationship was forced to 20, the intercept (b20) was −68.5 dB (R2 = 79.5 %). The acoustic parameters presented in this work are key to providing an alternative to the uncertainties associated with the traditionally used fishery-dependent abundance indices of ABFT in the Bay of Biscay and abroad.

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来源期刊
Fisheries Research
Fisheries Research 农林科学-渔业
CiteScore
4.50
自引率
16.70%
发文量
294
审稿时长
15 weeks
期刊介绍: This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.
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