Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
In recent decades, there has been a decline in the marine growth of Atlantic salmon (Salmo salar) over large parts of the distribution range. One hypothesis for this reduced growth is increased interspecific competition with other planktivorous pelagic fish in the ocean. Here, interactions between salmon postsmolts and other pelagic fish (mackerel (Scomber scombrus) and herring (Clupea harengus)) in the Northeast Atlantic were investigated. There was a low diet overlap between postsmolts and the two other planktivorous pelagic species. Both mackerel and herring were feeding predominantly on copepods and other small zooplankton, while salmon were feeding mostly on fish larvae. All three species feed on euphausiids and amphipods. Furthermore, postsmolts geographically overlapped with mackerel but had a low geographic overlap with herring. There was no correlation between the abundance or survival of salmon from key index rivers and the abundance of pelagic fish. This study did not find evidence to support the hypothesis that observed temporal changes in marine growth and survival of salmon can be explained by feeding interactions with pelagic fish.

中文翻译：

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大西洋鲑（Salmo salar）后蜕皮与东北大西洋其他浮游鱼类之间的进食相互作用

《加拿大渔业和水生科学杂志》，印刷前。
近几十年来，大西洋鲑（Salmo撒拉族）的海洋生长在大部分分布范围内都有所下降。这种生长减少的一个假设是与海洋中其他浮游性浮游鱼类的种间竞争增加。在这里，研究了东北大西洋鲑鱼后蜕皮与其他浮游鱼类（鲭鱼（Scomber scombrus）和鲱鱼（Clupea harengus））之间的相互作用。后蜕皮和其他两种浮游上层鱼类之间的饮食重叠较低。鲭鱼和鲱鱼都主要以co足类和其他小型浮游动物为食，而鲑鱼则主要以鱼幼虫为食。这三个物种都以e鱼和两栖动物为食。此外，后蜕皮在地理上与鲭鱼重叠，但与鲱鱼的地理重叠较低。关键指标河中鲑鱼的丰度或存活与中上层鱼类的丰度之间没有相关性。这项研究没有找到证据支持这一假说，即通过喂饲与中上层鱼类的相互作用可以解释观察到的鲑鱼海洋生长和生存的时间变化。