...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >Allowing for environmental effects in a management strategy evaluation for Japanese sardine
【24h】

Allowing for environmental effects in a management strategy evaluation for Japanese sardine

机译：在日本沙丁鱼经营战略评估中考虑环境影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Japanese sardine (Sard'mops melanostictus) is a valuable, but highly variable, resource. After record catches during the late 1980s, a 4-year recruitment failure, coupled with overfishing, resulted in severe stock depletion. TAC-based management was introduced in 1997, but the trend has not been reversed and the biomass is now 2 orders of magnitude below the value in 1987. Although a strong correlation exists between winter sea surface temperature (SST) in the nursery area and recruitment, uncertainty about future environmental effects is not explicitly considered in the management. We evaluate the robustness of three catch rules to environmental uncertainty, as captured by three stock-recruitment models (one without an environmental factor and two based on correlations between recruitment and SST for two datasets), in terms of the risk of further depletion, average biomass, and average catch: a constant fishing mortality (CF), a strategy that follows the Japanese guidelines (JC), and a more conservative strategy (ENV) that uses a temperature threshold as a proxy for regime shifts to switch between alternative catch rules. ENV and JG performed better than CF, with ENV displaying better performance in the long term, but differences were negligible in the short term.
机译：日本沙丁鱼（Sard'mops melanostictus）是一种宝贵的资源，但变化很大。在1980年代后期创纪录的捕捞量之后，四年的征募失败，再加上过度捕捞，导致种群严重枯竭。基于TAC的管理于1997年开始实施，但这一趋势并未逆转，现在的生物量比1987年的水平低2个数量级。尽管苗圃地区的冬季海表温度（SST）与招聘之间存在很强的相关性因此，管理层并未明确考虑未来环境影响的不确定性。我们评估了三种捕捞规则对环境不确定性的鲁棒性，如进一步消耗的风险（平均值），这三种捕捞规则是通过三种种群招聘模型（一种没有环境因素，另一种基于两个数据集的征聘和SST之间的相关性）捕获的。生物量和平均捕捞量：恒定的捕鱼死亡率（CF），遵循日本指南（JC）的策略以及采用温度阈值作为政权转移的替代物的更保守的策略（ENV），以在其他捕捞规则之间进行切换。 ENV和JG的性能优于CF，ENV的长期性能更好，但短期内的差异可以忽略不计。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号