• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Workshop on Application of Stock Identification in Defining Marine Distribution and Migration of Salmon >Spatial Distributions of Juvenile Chum Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking in Relation to Zooplankton Community
【24h】

Spatial Distributions of Juvenile Chum Salmon in the Coastal Waters of Eastern Hokkaido Determined with Otolith-Marking in Relation to Zooplankton Community

机译：耳石标记确定的北海道东部沿海鲑鱼幼体空间分布与浮游动物群落的关系

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 number of hatchery-origin chum salmon in Hokkaido increased from 10 million in the middle 1970s (brood year) to 40 million in the 1980s. During the 1990s, the chum population fluctuated between 27 and 65 million with return rates varying between 2.6% and 5.9%. There have also been great differences in return rates among chum returning to the Okhotsk Sea, the Japan Sea, and the Pacific Ocean. Recent return rates to the streams and coast of the Okhotsk Sea have been much higher than those in other areas. More interestingly, great differences in return rates between early and late run groups were found; return rates for early runs were higher than for late runs. We conclude that these fluctuations and differences are caused by coastal water conditions in relation to food production and predation.
机译：北海道的孵化场鲑鱼的数量从1970年代中期（育雏年）的1000万增加到1980年代的4000万。在1990年代，密友数量在27至6500万之间波动，回报率在2.6％至5.9％之间。返回鄂霍次克海，日本海和太平洋的密友返回率也存在很大差异。最近返回鄂霍次克海的溪流和海岸的回报率远高于其他地区。更有趣的是，发现早期和晚期跑步组之间的回报率差异很大。早期运行的回报率高于晚期运行。我们得出的结论是，这些波动和差异是由于沿海水域条件与粮食生产和捕食有关。

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