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Selecting relative abundance proxies for B_(MSY) and B_(MEY)

机译：选择B_（MSY）和B_（MEY）的相对丰度代理

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摘要

The objectives for many commercial fisheries include maximizing either yield or profit. Clearly specified management targets are a key element of effective fisheries management. Biomass targets are often specified for major commercial fisheries that are managed using quantitative stock assessments where biomass is calculated and tracked over time. B_(MSY), the biomass corresponding to Maximum Sustainable Yield, is often used as a target when maximizing yield is important, while B_(MEY) is the biomass target to maximize profit. There are difficulties in estimating both quantities accurately, and this paper explores default proxies for each target biomass, expressed as biomass levels relative to carrying capacity, which are more easily estimated. Integration across a range of uncertainties about stock dynamics and the costs of fishing suggests that a proxy for B_(MSY) in the range of 35-40% of carrying capacity minimizes the potential loss in yield compared with that which would arise if B_(MSY) was known exactly, while a proxy for B_(MEY) of 50-60% of carrying capacity minimizes the corresponding potential loss in profit. These estimates can be refined given stock-specific information regarding productivity (particularly the parameter which defines the resilience of recruitment to changes in spawning stock size) and costs and prices. It is more difficult to find a biomass level that achieves a high expected profit than a biomass level that achieves a high expected catch, because the former is sensitive to uncertainties related to costs and prices, as well as parameters which determine productivity.
机译：许多商业渔业的目标包括使产量或利润最大化。明确规定的管理目标是有效渔业管理的关键要素。生物量目标通常是为主要的商业渔业指定的，这些目标利用定量种群评估进行管理，其中随着时间的推移计算和跟踪生物量。当最大化产量至关重要时，B_（MSY）是与最大可持续产量相对应的生物量，通常被用作目标，而B_（MEY）是最大化利润的生物量目标。准确估算这两个数量存在困难，本文探讨了每种目标生物量的默认代理，用相对于承载能力的生物量水平表示，这更容易估算。对种群动态和捕捞成本的一系列不确定性进行的整合表明，与B_（MSY）相比，B_（MSY）在承载能力的35-40％范围内的替代可以最大程度地减少潜在的产量损失）是已知的，而B_（MEY）的承载能力的50％至60％的代理人则使相应的潜在利润损失最小化。给定与生产力有关的特定于种群的信息（尤其是定义招聘对产卵种群大小变化的适应力的参数）以及成本和价格的信息，可以对这些估计进行完善。与获得高预期捕捞量的生物质水平相比，找到具有较高预期利润的生物质水平更为困难，因为前者对与成本和价格有关的不确定性以及决定生产率的参数敏感。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第3期|469-483|共15页
  • 作者

    Andre E. Punt; Anthony D. M. Smith; David C. Smith; Geoffrey N. Tuck; Neil L. Klaer;

  • 作者单位

    CSIRO Wealth from Ocean Flagship, CSIRO Marine and Atmospheric Research, Castray Esplanade, Hobart, Tasmania, 7001, Australia,School of Aquatic and Fishery Sciences, Box 355020, University of Washington, Seattle, WA 98195-5020, USA;

    CSIRO Wealth from Ocean Flagship, CSIRO Marine and Atmospheric Research, Castray Esplanade, Hobart, Tasmania, 7001, Australia;

    CSIRO Wealth from Ocean Flagship, CSIRO Marine and Atmospheric Research, Castray Esplanade, Hobart, Tasmania, 7001, Australia;

    CSIRO Wealth from Ocean Flagship, CSIRO Marine and Atmospheric Research, Castray Esplanade, Hobart, Tasmania, 7001, Australia;

    CSIRO Wealth from Ocean Flagship, CSIRO Marine and Atmospheric Research, Castray Esplanade, Hobart, Tasmania, 7001, Australia;

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  • 正文语种 eng
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  • 关键词

    economics; management proxies; maximum economic yield; maximum sustainable yield;

    机译：经济学;管理代理;最大的经济产量;最大可持续产量;

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