...
  • 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 >Short-term stock assessment of Loligo gahi at the Falkland Islands: sequential use of stochastic biomass projection and stock depletion models
【24h】

Short-term stock assessment of Loligo gahi at the Falkland Islands: sequential use of stochastic biomass projection and stock depletion models

机译：福克兰群岛的Loligo gahi短期种群评估：随机生物量预测和种群枯竭模型的顺序使用

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

Two short-term stock assessment models are combined to examine the pre-season, in-season, and post-season dynamics of the Loligo gahi fishery off the Falkland Islands over four consecutive fishing seasons. A stochastic biomass projection model (SBPM) projects a pre-season survey-based biomass estimate from the date of the survey to the start of the season. A stock depletion model (SDM) assesses in-season biomass from commercial daily catch-and-effort data. The SBPM projects the SDM biomass estimate at the end of the season to a post-season date of spawning. Combining the SBPM and the SDM helps to clarify the spatio-temporal functioning of the stock and to assess the comparability of survey- and fishery-based estimates of biomass. For the first 2005 season, projected length frequencies indicate two pulses of recruitment onto the fishing grounds. Survey-based projections of biomass were lower than equivalent fishery-based estimates. Over two surveys, the sex ratio was balanced, suggesting full recruitment of both sexes onto the fishing grounds, and the ratio of survey-projected to fishing-estimated biomass was constant. This constant is interpreted as a scaling factor between survey biomass and absolute biomass.
机译：结合了两个短期种群评估模型，以检查在连续四个捕捞季节中福克兰群岛外的Loligo gahi捕捞的季节前，季节内和季节后动态。随机生物质预测模型（SBPM）可以根据季节前的调查，从调查日期到季节开始预测基于生物量的估计。库存枯竭模型（SDM）通过商业日常捕捞量和努力量数据评估季节生物量。 SBPM将SDM生物量估计值在季节结束时预测为产后的产后日期。将SBPM和SDM结合使用有助于阐明种群的时空功能，并评估基于调查和渔业的生物量估算值的可比性。在2005年的第一个季节，预计的长度频率表明有2个脉冲被捕捞到渔场上。基于调查的生物量预测低于基于渔业的同等估计。在两次调查中，性别比例是平衡的，这表明两性都已完全征募到渔场上，并且调查预计的比例与估计的捕鱼生物量的比例是恒定的。该常数被解释为调查生物量和绝对生物量之间的比例因子。

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