Abstract

Fisheries independent surveys support science and fisheries assessments but are costly. Evaluating the efficacy of a survey before initiating it could save costs. We used the NORWECOM.E2E model to simulate Northeast Atlantic mackerel and Norwegian spring spawning herring distributions in the Norwegian Sea, and we ran vessel transects in silico to simulate acoustic-trawl surveys. The simulated data were processed using standard survey estimation software and compared to the stock abundances in the ecosystem model. Three existing real surveys were manipulated to demonstrate how the simulation framework can be used to investigate effects of changes in survey timing, direction, and coverage on survey estimates. The method picked up general sources of biases and variance, i.e. that surveys conducted during fish migrations are more vulnerable in terms of bias to timing and changes in survey direction than during more stationary situations and that increased effort reduced the sampling variance.

中文翻译：

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使用端到端生态系统模型评估拖网调查策略

摘要

渔业独立调查支持科学和渔业评估，但费用昂贵。在启动调查之前评估其有效性可以节省成本。我们使用NORWECOM.E2E模型来模拟东北大西洋鲭鱼和挪威春季产卵鲱鱼在挪威海中的分布，并在计算机上运行了样带模拟声学拖网调查。使用标准调查估算软件处理模拟数据，并将其与生态系统模型中的种群数量进行比较。对三个现有的真实调查进行了操作，以演示如何使用模拟框架调查调查时间，方向和覆盖范围的变化对调查估计值的影响。该方法收集了偏差和方差的一般来源，即，在鱼类迁徙期间进行的调查比在更平稳的情况下更易受时间和方向变化的影响，而增加的工作量减少了抽样方差。