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首页> 外文期刊>Marine ecology progress series >Determinants of mean length at age of spring spawning herring off the coast of Hokkaido, Japan
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Determinants of mean length at age of spring spawning herring off the coast of Hokkaido, Japan

机译：日本北海道沿海产卵鲱鱼春季平均长度的决定因素

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The stock of Hokkaido spring spawning herring Clupea pallasii collapsed in the middle of the 20th century. In the first half of the 20th century, large amounts of spawning herring were caught by set nets at coastal spawning grounds off the coast of Hokkaido, Japan. Using the catch data, we analyzed the mean length at age with respect to sea-surface temperature and density-dependent growth during the years 1910 to 1954 by generalized additive modeling (GAM). This stock is distributed at the southern boundary of the distribution range of Pacific herring, and we thus hypothesized that high temperatures have a negative effect on growth. Our study shows that length of Hokkaido spring spawning herring is highly dependent on growth during the first years of life and on temperatures preceding and during the feeding season. Higher temperatures during winter have a negative effect on growth. We found only weak indications of density-dependent growth in the stock of Hokkaido spring spawning herring.
机译：在20世纪中叶，北海道春季产卵鲱鱼Clupea pallasii的种群崩溃了。在20世纪上半叶，在日本北海道沿岸的沿海产卵场，大量的产卵鲱鱼被固定网捕获。利用捕获数据，我们通过广义加性建模（GAM）分析了1910年至1954年间年龄相对于海表温度和密度依赖性生长的平均长度。该种群分布在太平洋鲱鱼分布范围的南部边界，因此我们假设高温对生长有负面影响。我们的研究表明，北海道春季产卵鲱鱼的长度高度依赖于生命最初几年的生长以及饲喂季节之前和期间的温度。冬季高温会影响生长。我们在北海道春季产卵鲱鱼种群中仅发现了密度依赖性生长的微弱迹象。

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