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首页> 外文期刊>The Progressive Fish-Culturist >Survival and growth of two stocks of presmolt chinook salmon held overwinter in marine net-pens with an artificial freshwater lens
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Survival and growth of two stocks of presmolt chinook salmon held overwinter in marine net-pens with an artificial freshwater lens

机译：用人工淡水晶状体在海洋网箱中越冬的两种前嗅到的奇努克鲑鱼种群的生存和生长

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摘要

Two hatchery stocks of spring chinook salmon (Oncorhynchus tshawytscha) originating from 2 southeast Alaska rivers were reared in freshwater to an average size of 8-10 g and stocked in marine net-pens with an artificial freshwater lens system (AFLS)from mid-September to early November 1987, or into freshwater raceways. 60 fish from each stock were also placed in tanks containing 30% seawater. Overwinter survival to May 1988 in the net-pens with AFLS averaged 83.6% for Unuk River stock and 76.0% for Chickamin River stock and did not differ significantly for the stocking dates. Survival over 24 h differed significantly when entry was directly into 30% seawater. The 24-h plasma sodium levels in the juveniles challenged to either full-strength seawater or marine net-pens with an AFLS were not useful predictors of overwinter survival. Over winter, both stocks had a higher (P<0.001) growth rate in the AFLS system than in freshwater.
机译：从9月中旬开始，在阿拉斯加东南部2条河流中孵化的两头春季奇努克鲑鱼（Oncorhynchus tshawytscha）孵化场，将淡水养成平均大小为8-10克，并用人工淡水镜系统（AFLS）放养在海水网箱中。到1987年11月上旬，或进入淡水水道。还将每只种群的60条鱼放在装有30％海水的水箱中。截至1988年5月，乌努克河水库网箱的平均成活率平均为83.6％，奇卡明河水库网箱的平均越冬生存率为76.0％，并且在放养日方面没有显着差异。当直接进入30％的海水中时，在24小时内的生存率差异显着。受到全强度海水或带有AFLS的海洋网围栏攻击的少年的24小时血浆钠水平不是预测越冬存活率的有用指标。在冬季，AFLS系统中的两种种群的增长率都高于淡水（P <0.001）。

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