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首页> 外文期刊>ICES Journal of Marine Science >Quantifying causes of discard variability: an indispensable assistance to discard estimation and a paramount need for policy measures
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Quantifying causes of discard variability: an indispensable assistance to discard estimation and a paramount need for policy measures

机译：量化丢弃物可变性的原因：对丢弃物估计的必不可少的帮助，以及对政策措施的最重要需求

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摘要

Fishery-dependent data underpin the scientific advice given to fishery managers. However, discard estimates are often imprecise as a result of limited sampling coverage. Estimating discard rates from length frequency distributions (LFDs) in commercial catches may complement information from observer trips. The accuracy of estimates depends greatly on careful investigation of the discard varia-bility. Here, the impact of three essential factors was quantified for beam-trawl fisheries in the southern North Sea: (i) market prices, (ii) landings per trip (LPT) limitations, and (iii) selectivity of the commercial fishing gear. Observed discard rates for cod, plaice, sole, and whiting were compared with estimates based on length frequency data, taking account of the variability attributable to LPT limit-ations and market price. Observed discard estimates of cod and whiting differed significantly from LFD-derived estimates because of highgrading. The results indicate that LFD-derived discard estimates are only reliable if the crucial driving factors are quantified. LFDs can be collected from research vessels or by fishers in partnership with scientists. Based upon many of these LFDs and the discard-variability factors identified in observer programmes, discard rates can be estimated better.
机译：依赖渔业的数据为渔业管理者提供了科学建议。但是，由于采样范围有限，丢弃的估算值通常不准确。根据商业渔获物的长度频率分布（LFD）估算丢弃率可以补充来自观察者旅行的信息。估算的准确性很大程度上取决于对丢弃物可变性的仔细调查。在这里，量化了三个基本因素对北海南部的拖网捕捞渔业的影响：（i）市场价格，（ii）每趟登陆次数（LPT）限制，以及（iii）商业捕鱼工具的选择性。考虑到可归因于LPT限制和市场价格的可变性，将观察到的鳕鱼，，鞋底和鳕鱼的丢弃率与基于长度频率数据的估计值进行比较。由于高等级，观察到的鳕鱼和白垩草的丢弃物估计值与LFD得出的估计值有很大差异。结果表明，只有在关键驱动因素被量化的情况下，LFD得出的丢弃物估计才是可靠的。 LFD可以从研究船上收集，也可以由渔民与科学家合作收集。基于许多这些LFD和观察者计划中确定的丢弃可变性因素，可以更好地估算丢弃率。

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  • 来源
    《ICES Journal of Marine Science》 |2011年第8期|p.1719-1725|共7页
  • 作者

    Jochen Depestele; Sofie Vandemaele; Willy Vanhee; HansPolet; ElsTorreele; HerwigLeirs; Magda Vincx;

  • 作者单位

    The Institute for Agricultural and Fisheries Research (ILVO), Ankerstraat 1, B-8400 Ostend, Belgium Chent University, Marine Biology, Krijgslaan 281-S8, B-9000 Ghent, Belgium;

    The Institute for Agricultural and Fisheries Research (ILVO), Ankerstraat 1, B-8400 Ostend, Belgium University of Antwerp, Croenenborgerlaan 171, B-2020 Antwerp, Belgium;

    The Institute for Agricultural and Fisheries Research (ILVO), Ankerstraat 1, B-8400 Ostend, Belgium;

    The Institute for Agricultural and Fisheries Research (ILVO), Ankerstraat 1, B-8400 Ostend, Belgium;

    The Institute for Agricultural and Fisheries Research (ILVO), Ankerstraat 1, B-8400 Ostend, Belgium;

    University of Antwerp, Croenenborgerlaan 171, B-2020 Antwerp, Belgium;

    Chent University, Marine Biology, Krijgslaan 281-S8, B-9000 Ghent, Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    beam trawl; discards; fishery management; highgrading; market price; minimum landing size; North Sea; quota;

    机译：梁拖网丢弃渔业管理;高等级市场价;最小着陆尺寸;北海;配额;

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