Fluctuations in year-class strength and growth of the vendace (Coregonus albula (L.)) in the small, mesohumic, oligotrophic Suomunjärvi, a lake in eastern Finland
Fluctuations in year-class strength and growth of the vendace (Coregonus albula (L.)) in the small, mesohumic, oligotrophic Suomunjärvi, a lake in eastern Finland
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芬兰东部小型、中欧、寡营养的 Suomunjärvi 湖中白鲑 (Coregonus albula (L.)) 的年份强度和生长的波动
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
P. Väisänen
中科院分区：
文献类型：
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作者：
M. Viljanen;T. Turunen;P. Väisänen
对芬兰最重要的商业淡水鱼种——芬兰Coregonus albula （L.）进行了1974-2001年围网和刺网捕捞量的年际变化和生长情况的评价。我们估计了各个年类的相对丰度和生长情况。1980年、1985年、1990年和2000年的年级表现强劲。年级间的强度经常出现振荡，但振荡周期并不规律。几乎只要它们在湖中存在，强劲的年长者就占据了捕捞量的主导地位。最强的一年的班级大约是最弱的300倍。年级的增长变化很大；最强年级和最弱年级之间的增长率差异约为2.5倍。一个年级的生长量与年级的强度呈显著的负相关（p < 0.001）。整体存量规模（CPUE数据）对年增长率也有负向影响（p < 0.005）。
Year-class variation and growth of the vendace (Coregonus albula (L.)), the most important commercial freshwater fish species in Finland, was assessed in Suomunjarvi from 1974-2001 seine and gill net catches. We estimated the relative abundances and growth of the individual year-classes. The year-classes 1980, 1985, 1990, and 2000 were strong. There were often oscillations of year-class strengths, although the period of oscillation was not regular. Strong year-classes dominated catches for almost as long as they were present in the lake. The strongest year-class was about 300 times greater in size than the weakest. The growth of the year-classes varied considerably; the difference in growth rate between the strongest and weakest year class was about 2.5-fold. Comparison of the growth of a year-class with its strength showed a marked negative correlation (p < 0.001). The size of the whole stock (CPUE data) also had a negative effect on yearly growth (p < 0.005).