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

机译：北北海道沿海水域的空间分布与欧斯特里斯标记与浮游动物社区有关

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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：北海道的孵化人口呼啸鲑鱼的数量从20世纪70年代中期（巢年度）增加到20世纪80年代的1000万。在20世纪90年代期间，呼吸群体波动在27至6500万之间，退货率不同2.6％和5.9％。回到okhotsk海，日本大海和太平洋的呼吸率也存在巨大差异。鄂霍次克海的溪流和海岸的最近退货率远高于其他地区的溪流。更有趣的是，发现早期和后期运行组之间的回归差异差异;早期运行的退货率高于延迟运行。我们得出结论，这些波动和差异是由沿海水条件与粮食生产和捕食有关造成的。

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