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首页> 外文期刊>ICES Journal of Marine Science >Objective determination of the sea age of Atlantic salmon from the sizes and dates of capture of individual fish
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Objective determination of the sea age of Atlantic salmon from the sizes and dates of capture of individual fish

机译：从捕获单个鱼的大小和日期确定客观确定大西洋鲑鱼的海时代

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摘要

The sea ages of Atlantic salmon indicate crucial differences between oceanic feeding zones that have important implications for conservation and management. Historical fishery-catch records go back more than 100 years, but the reliability with which they discriminate between sea-age classes is uncertain. Research data from some 188 000 scale-aged Scottish salmon that included size (length, weight) and seasonal date of capture on return to the coast were investigated to devise a means of assigning sea age to individual fish objectively. Two simple bivariate probability distributions are described that discriminate between 1SW and 2SW fish with 97% reliability, and between 2SW and 3SW fish with 70% confidence. The same two probability distributions achieve this accuracy across five major east coast Scottish rivers and five decades. They also achieve the same exactitude for a smaller recent dataset from the Scottish west coast, from the River Tweed a century ago (1894/1895), and for salmon caught by rod near the estuary. More surprisingly, they also achieve the same success for rod-caught salmon taken at beats remote from the estuary and including capture dates when some fish could have been in the river for a few months. The implications of these findings for fishery management and conservation are discussed.
机译：大西洋鲑鱼的海龄表明海洋饲喂区之间的关键差异对保护和管理具有重要意义。历史渔业捕捞记录可以追溯到100多年以前，但是它们在区分海洋年龄类别方面的可靠性尚不确定。调查了大约188 000个规模化的苏格兰鲑鱼的研究数据，包括大小（长度，重量）和返回海岸时的季节性捕获日期，目的是设计一种客观地确定单个鱼类海洋年龄的方法。描述了两个简单的双变量概率分布，它们以97％的可靠性区分1SW和2SW的鱼类，以及以70％的置信度区分2SW和3SW的鱼类。同样的两个概率分布在苏格兰的五个主要东海岸河流和五个十年中都达到了这种精度。对于来自苏格兰西海岸，一个世纪前的特威德河（1894/1895）的较小近期数据集以及河口附近被钓竿捕获的鲑鱼，它们的精度也相同。更令人惊讶的是，它们还获得了在远离河口的节拍上捕获的鲑鱼捕获鲑鱼的同样成功，其中包括一些鱼类可能在河中停留了几个月的捕获日期。讨论了这些发现对渔业管理和保护的意义。

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  • 来源
    《ICES Journal of Marine Science》 |2011年第1期|p.130-143|共14页
  • 作者

    Philip J. Bacon; William S. C. Gurney; Eddie McKenzie; Bryce Whyte; Ronald Campbell; Robert Laughton; Gordon Smith; Julian MacLean;

  • 作者单位

    Mar'me Scotland, Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5LB, Scotland, UK;

    Mar'me Scotland, Freshwater Laboratory, Faskally, Pitlochry, Perthshire PH16 5LB, Scotland, UK,Department of Mathematics and Statistics, University of Strathclyde, Glasgow G11XH, Scotland, UK;

    Department of Mathematics and Statistics, University of Strathclyde, Glasgow G11XH, Scotland, UK;

    Marine Scotland, Freshwater Laboratory, Inchbraoch House, South Quay, Ferryden, Montrose, Angus DD70 9SL, Scotland, UK;

    The Tweed Foundation, Drygrange Steading by Melrose, Roxburghshire TD6 9DJ, Scotland, UK;

    The Spey Research Trust, 1 Nether Borlum, Knockando, Morayshire AB38 7SD, Scotland, UK;

    Marine Scotland, Freshwater Laboratory, Inchbraoch House, South Quay, Ferryden, Montrose, Angus DD70 9SL, Scotland, UK;

    Marine Scotland, Freshwater Laboratory, Inchbraoch House, South Quay, Ferryden, Montrose, Angus DD70 9SL, Scotland, UK;

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  • 正文语种 eng
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  • 关键词

    conservation; salmo salar; stock management; temporal stability;

    机译：保护;salmo salar;库存管理;时间稳定性;

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