Self-starting cumulative sum harvest control rule (SS-CUSUM-HCR) for status-quo management of data-limited fisheries

Self-starting cumulative sum harvest control rule (SS-CUSUM-HCR) for status-quo management of data-limited fisheries
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用于数据有限渔业现状管理的自启动累积收获量控制规则(SS-CUSUM-HCR)

DOI:
10.1139/cjfas-2015-0039
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发表时间:
2016
影响因子:
2.4
通讯作者:
Pazhayamadom D
Pazhayamadom D
中科院分区:
农林科学2区
文献类型:
--
作者:
Pazhayamadom D

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我们展示了一个收获控制规则的基础上,自启动累积和(SS-EQUUM)控制图,可以保持鱼类种群在其起始(现状)水平。SS-STRUUM是质量控制工程中常用的指标监测工具,不需要长时间序列或预定义的参考点来检测时间趋势。SS-SCHEUM中的参考点以运行平均值的形式进行校准,当有新的观测结果时,这些平均值将不断更新。SS-STRUUM可以在时间序列中少至两个观测值的情况下启动,并且可以在许多其他方法之前很久,在初始数据可用后不久应用。一个广泛的股票指标可以监测,但在这项研究中,我们证明了使用两个指标的同等加权和的方法:招聘指标和大型鱼类指标从模拟渔业。我们假设,除了2年的指标数据和当前收获水平外,没有生活史数据可用。从SS-CANUUM产生的信号触发捕捞控制规则(SS-CANUUM-HCR),其中计算指标时间序列中发生的变化,并将其用作更新总可捕量的调整因子。我们的研究表明,SS-EQUUM-HCR可以维持鱼类种群在其初始现状水平(即使是过度捕捞的初始状态),但如果渔业已经处于不理想的状态,如股票崩溃的范围有限。我们讨论了如何SS-CANUUM方法可以适应超越现状的管理策略,如果渔业的理想状态的额外信息。
We demonstrate a harvest control rule based on the self-starting cumulative sum (SS-CUSUM) control chart that can maintain a fish stock at its starting (status-quo) level. The SS-CUSUM is an indicator monitoring tool commonly used in quality control engineering and does not require a long time series or predefined reference point for detecting temporal trends. The reference points in SS-CUSUM are calibrated in the form of running means that are updated on an ongoing basis when new observations become available. The SS-CUSUM can be initiated with as few as two observations in the time series and can be applied long before many other methods, soon after initial data become available. A wide range of stock indicators can be monitored, but in this study, we demonstrate the method using an equally weighted sum of two indicators: a recruitment indicator and a large fish indicator from a simulated fishery. We assume that no life history data are available other than 2 years of both indicator data and current harvest levels when the SS-CUSUM initiates. The signals generated from SS-CUSUM trigger a harvest control rule (SS-CUSUM-HCR), where the shift that occurs in the indicator time series is computed and is used as an adjustment factor for updating the total allowable catch. Our study shows that the SS-CUSUM-HCR can maintain the fish stock at its starting status-quo level (even for overfished initial states) but has limited scope if the fishery is already in an undesirable state such as a stock collapse. We discuss how the SS-CUSUM approach could be adapted to move beyond a status-quo management strategy, if additional information on the desirable state of the fishery is available.
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