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首页> 外文期刊>ICES Journal of Marine Science >Impact of survey design changes on stock assessment advice: sea scallops
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Impact of survey design changes on stock assessment advice: sea scallops

机译：调查设计更改对种群评估建议的影响：海扇贝

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Annual surveys of marine resources are used to monitor changes in population composition and abundance. Improvements in the performance and coverage of these surveys can readily be evaluated for the surveys themselves but should also be considered in the context of the stock assessment models that use the estimates from these surveys. For those surveys based on a probability design, improvements in the probability design are usually evaluated with respect to the resultant increase in precision of the survey estimates. Survey precision estimates can be included in many stock assessment models as observation error, as long as the process error component of the model is also identified. Advice on catch levels for sea scallop populations (Placopecten magellanicus) around Nova Scotia is developed using a Bayesian state space assessment model in which both observation and process error terms have been defined. Information on survey estimates of precision are included in the observation error component of the assessment model and the impacts of changes in survey precision on the provision of advice can be evaluated in terms of reference points and management advice. The sensitivity of stock assessment advice to changes in the level of precision of survey estimates was evaluated for three scallop fisheries around Nova Scotia. The results indicated that the impact of the changes depended upon the degree of concurrence between the annual changes in biomass as observed from the survey and those predicted by the model.
机译：海洋资源的年度调查用于监测人口组成和数量的变化。这些调查的性能和覆盖范围的改进可以很容易地针对调查本身进行评估，但是也应该在使用这些调查的估计值的库存评估模型的背景下进行考虑。对于那些基于概率设计的调查，通常会就调查估计精度的提高结果来评估概率设计的改进。只要还可以确定模型的过程误差成分，就可以将观察精度估计值包括在许多库存评估模型中作为观察误差。使用贝叶斯状态空间评估模型，对新斯科舍省附近海扇贝种群（麦哲伦）的捕捞水平提出了建议，其中定义了观测和过程误差项。评估模型的观察误差部分中包含了有关测量精度估计的信息，可以根据参考点和管理建议来评估测量精度变化对提供建议的影响。对新斯科舍省附近的三个扇贝渔业评估了种群评估建议对调查估计精度水平变化的敏感性。结果表明，变化的影响取决于从调查中观察到的生物量的年度变化与模型预测的变化之间的并发程度。

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