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首页> 外文期刊>ICES Journal of Marine Science >How effective is electronic monitoring in mixed bottom-trawl fisheries?
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How effective is electronic monitoring in mixed bottom-trawl fisheries?

机译：电子监测在拖网混养渔业中的效果如何？

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In the context of the landing obligation under the European Common Fisheries Policy, electronic monitoring (EM) is often presented as one of the solutions to fully document catches. EM includes video monitoring to record the catch handling process on board the vessels. This study evaluated the efficacy of EM for cod (Gadus morhua) catches on vessels in a mixed bottom-trawl fishery and tested the hypothesis that cod catches are difficult to detect with video monitoring, specifically in catches with large volumes of bycatch. In 2011, a catch quota pilot study started for cod in the Dutch bottom-trawl fishery in which EM was used as an audit system to review the consistency of reported cod catches. Eleven vessels joined the pilot study on a voluntary basis. Participants received a 30% increase in individual quota for cod and were compensated with extra effort in days at sea. In return, all cod catches were counted against their cod quota. This mixed bottom-trawl fishery differs from fisheries where EM was proven to be a successful method, e.g. hook and line or single-species fisheries with low bycatch volumes. We conclude that distinguishing small numbers of cod in catches of mixed bottom-trawl fisheries is difficult because there is a low correlation between logbook and video data (Pearson r = 0.17). We expect similar difficulty in other mixed demersal trawl fisheries with large bycatch volumes, when similar-looking species are targeted. Meanwhile, implementing a landing obligation will pose large challenges for fisheries with large volumes of bycatch. Limitations in the applicability of EM to control one of the most common types of fisheries in Europe will be a burden on the implementation of the European landing obligation. Improved protocols and technical adaptations may reduce some of the limitations encountered in this study.
机译：在欧洲共同渔业政策规定的着陆义务的背景下，通常将电子监控（EM）作为全面记录渔获量的解决方案之一。 EM包括视频监控，以记录船舶上的捕捞处理过程。这项研究评估了EM对混合底拖网渔业中的鳕鱼（Gadus morhua）捕捞的功效，并检验了很难通过视频监控检测到鳕鱼捕捞的假说，特别是在具有大量副渔获物的捕捞中。 2011年，针对荷兰底拖网渔业中的鳕鱼进行了捕捞配额试点研究，在该研究中，使用EM作为审核系统来审查报告的鳕鱼捕捞的一致性。 11艘船自愿参加了试验研究。参与者的鳕鱼个人配额增加了30％，并且在海上的日子里付出了额外的努力。作为回报，所有鳕鱼捕获量均计入其鳕鱼配额。这种混合拖网捕捞渔业与证明EM是一种成功方法的渔业不同，例如兼捕量低的钩线或单物种渔业。我们得出结论，很难区分混合底拖网渔业捕捞中的少量鳕鱼，因为日志和视频数据之间的相关性很低（Pearson r = 0.17）。当目标相似的物种被捕捞时，我们预计其他兼捕量大的其他混合式深海拖网渔业也将面临类似的困难。同时，对具有大量兼捕物的渔业而言，履行登陆义务将给渔业带来巨大挑战。新兴市场对控制欧洲最常见渔业之一的适用性受到限制，这将成为执行欧洲登陆义务的负担。改进的协议和技术适应措施可能会减少本研究中遇到的一些限制。

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