Evaluation of current and alternative fisheries management scenarios based on spawning-per-recruit (SPR), revenue-per-recruit (RPR), and yield-per-recruit (YPR) diagrams
Evaluation of current and alternative fisheries management scenarios based on spawning-per-recruit (SPR), revenue-per-recruit (RPR), and yield-per-recruit (YPR) diagrams
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DOI：
10.1016/j.icesjms.2005.04.002
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发表时间：
2005-08-01
影响因子：
3.3
通讯作者：
Katsukawa, T
中科院分区：
文献类型：
--
作者：
Katsukawa, T
每补充产卵量（SPR）和每补充产量（YPR）分析被广泛用于评估被开发鱼类种群的资源。在渔业管理决策中，渔业生产（YPR）和种群繁殖（SPR）之间的权衡是重要的。SPR和YPR分析的一般输出，如单变量曲线与等高线或最佳收获策略估计的数值优化，是不合适的，在获得一个概述的权衡。本文介绍了一个图表，该图表以图形方式表达了YPR和SPR之间的双变量权衡。将该方法应用于鲭鱼（Scomber）数据，并使用SPR-YPR图比较了两种管理方案。还考虑了YPR和每招募人员收入（RPR）之间的差异。结果表明：（一）目前估计的捕捞死亡率是生长过度捕捞的暗示，并有空间提高SPR和YPR同时进行;（二）增加年龄在第一次捕获是更有效的努力控制;（三）管理战略，最大限度地提高登陆重量或收入是显着不同的。从收益最大化的角度考虑，最大化登陆重量的管理策略会导致过度捕捞。(c)2005年国际海洋考察理事会。由爱思唯尔有限公司出版。保留所有权利。
Spawning-per-recruit (SPR) and yield-per-recruit (YPR) analyses are widely used in stock assessments of exploited fish populations. In decision-making for fisheries management, the trade-off between fisheries production (YPR) and stock reproduction (SPR) is important. The general outputs of SPR and YPR analysis, such as single variate plots with contour lines or optimal harvest strategies estimated by numerical optimization, are inappropriate in obtaining an overview of the trade-off. This paper introduces a diagram that expresses graphically the bivariate trade-off between YPR and SPR. The method was applied to chub mackerel (Scomber japonicus) data, and two management scenarios were compared using the SPR-YPR diagram. Differences between YPR and revenue-per-recruit (RPR) were also considered. The results showed that: (i) current estimated fishing mortality is suggestive of growth-overfishing, and there is room for improving SPR and YPR simultaneously; (ii) increasing the age at first capture is more effective than effort control; (iii) management strategies that maximize landing weight or revenue are significantly different. The management strategy that maximizes landing weight, when considered from the viewpoint of maximizing revenue, results in growth-overfishing. (c) 2005 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All rights reserved.