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Applying global best practices for estimating unreported catches in Norwegian fisheries under a discard ban
Reviews in Fish Biology and Fisheries ( IF 6.2 ) Pub Date : 2020-12-24 , DOI: 10.1007/s11160-020-09624-w
Thomas L. Clegg , Steven J. Kennelly , Geir Blom , Kjell Nedreaas

In addition to their role as a fisheries management tool, discard bans can be effective in improving knowledge of total catches via the requirement to land and report all catches. This shifts the focus to understanding the scale of unreported catches in fisheries, rather than only on discards. However, the presence of a discard ban can cause problems with estimation process, as it involves the observation of illegal activities, and the complex sources of unreported catches require a different approach to estimation. The Norwegian discard ban was introduced in 1987 as part of a wider suite of regulatory measures to improve exploitation patterns in commercial fisheries, but a framework for the regular estimation of unreported catches has yet to be established and operationalised. Here, we aim to identify global best practices for estimating unreported catches under a discard ban and assess their applicability to Norwegian fisheries. We approach this in three steps: (1) defining the scope of an estimation, (2) data collection, and (3) the actual procedure for estimation. We discuss how each step can affect the quality of an estimate with regards to accuracy, precision, practical limitations and whether the estimate is fit for purpose. Finally, we provide a list of recommendations for future studies and identify key knowledge gaps and limitations regarding their application to Norwegian fisheries.



中文翻译:

根据丢弃禁令,运用全球最佳实践估算挪威渔业中未报告的渔获量

除其作为渔业管理工具的作用外,丢弃禁令还可以通过要求登陆和报告所有渔获量来有效地提高对总渔获量的了解。这将重点转移到了解渔业中未报告渔获物的规模,而不仅仅是丢弃物。但是,存在丢弃禁令可能会导致估算过程出现问题,因为这涉及观察非法活动,而且未报告渔获物的复杂来源需要采用不同的估算方法。挪威于1987年引入了禁止丢弃物的规定,作为一系列旨在改善商业性渔业开发方式的监管措施的一部分,但尚未建立和正常估计未报告渔获量的框架。这里,我们旨在确定全球最佳做法,以评估根据丢弃禁令进行的未报告渔获量,并评估其在挪威渔业中的适用性。我们通过三个步骤来实现这一目标:(1)定义估算范围,(2)数据收集,以及(3)估算的实际过程。我们讨论每个步骤如何影响估计的质量,包括准确性,准确性,实际限制以及估计是否适合目的。最后,我们提供了一份有关未来研究的建议清单,并确定了将其应用于挪威渔业的主要知识差距和局限性。我们讨论每个步骤如何影响估计的质量,包括准确性,准确性,实际限制以及估计是否适合目的。最后,我们提供了一份有关未来研究的建议清单,并确定了将其应用于挪威渔业的主要知识差距和局限性。我们讨论每个步骤如何影响估计的质量,包括准确性,准确性,实际限制以及估计是否适合目的。最后,我们提供了一份有关未来研究的建议清单,并确定了将其应用于挪威渔业的主要知识差距和局限性。

更新日期:2020-12-24
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