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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >The influence of hatchery coho salmon (Oncorhynchus kisutch) on the productivity of wild coho salmon populations in Oregon coastal basins
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The influence of hatchery coho salmon (Oncorhynchus kisutch) on the productivity of wild coho salmon populations in Oregon coastal basins

机译：孵化场鲑鱼对俄勒冈州沿海流域野生鲑鱼种群生产力的影响

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摘要

To aid in the recovery of depressed wild salmon populations, the operation of hatcheries must be changed to reduce interactions of juvenile hatchery fish with wild fish. Evidence suggests that productivity of wild populations can be reduced by the presence of large numbers of hatchery smolts in lower rivers and estuaries that attract predators. An index of productivity based on the density-independent rate of reproduction of wild coho salmon (Oncorhynchus kisutch) in 12 Oregon coastal river basins and two lake basins was negatively correlated with the average number of hatchery coho salmon smolts released in each basin. The index of productivity was not significantly correlated with the average proportion of hatchery coho salmon in each naturally spawning population or with habitat quality. Alterations to hatchery programs that could encourage recovery of wild populations include (i) avoiding release of large numbers of smolts in areas with high concentrations of wild fish, (ii) decreasing the number of smolts released, and (iii) using a volitional release strategy or a strategy that employs smaller release groups spread temporally.
机译：为了帮助恢复沮丧的野生鲑鱼种群，必须改变孵化场的运作，以减少幼体孵化鱼与野生鱼之间的相互作用。有证据表明，在较低的河流和河口吸引捕食者的地方存在大量孵化场的mol鱼，会降低野生种群的生产力。基于俄勒冈州12个沿海流域和两个湖泊流域的野生银大麻哈鱼（Oncorhynchus kisutch）繁殖密度无关的繁殖率的指数与每个盆地释放的孵化鲑科鲑鱼平均数量呈负相关。生产力指数与每个自然产卵种群孵化场鲑的平均比例或栖息地质量均无显着相关。孵化场计划的改变可能会鼓励野生种群的恢复，包括（i）避免在野生鱼类浓度高的地区释放大量的软体动物，（ii）减少释放的软体动物数量，以及（iii）采用自愿释放策略或采用较小的发布组在时间上分散的策略。

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