Agri-Food and Biosciences Institute, Newforge Lane, Belfast, N. Ireland, BT9 5PX, UK.
J Fish Biol. 2013 Sep;83(3):515-30. doi: 10.1111/jfb.12189.
The upstream migratory behaviour of wild and ranched Atlantic salmon Salmo salar in a small Irish coastal spate river was investigated using acoustic telemetry. Prespawning migratory behaviour was investigated including movement patterns at a large natural waterfall in the lower reaches of the river. A strong diurnal pattern was observed for upstream migrants at the waterfall indicative of the need for daylight to ascend this complex natural obstacle to migration. Successful passage of the waterfall was also associated with distinct environmental conditions and no difference in migratory ability was detected between wild and ranched origin S. salar. Wild S. salar tended to exhibit a non-erratic, stepwise upstream migration pattern after ascending the waterfall while ranched S. salar had an increased probability of displaying more erratic migratory behaviour. Wild S. salar penetrated further into the river catchment than ranched S. salar, although male ranched S. salar exhibited the greatest cumulative distance moved prior to the spawning period. The management implications of escaped or released ranched S. salar and movement at natural obstacles are discussed.
采用声学遥测技术研究了野生和养殖大西洋鲑（Salmo salar）在爱尔兰小型沿海急流河中洄游的上游迁徙行为。研究了产卵前的迁徙行为，包括河流下游大型天然瀑布处的运动模式。在瀑布处观察到洄游者具有强烈的昼夜节律模式，表明需要白天光照才能克服这种复杂的自然迁徙障碍。成功通过瀑布还与独特的环境条件相关联，并且在野生和养殖起源的 S. salar 之间没有检测到迁徙能力的差异。野生 S. salar 在爬上瀑布后倾向于表现出非波动的、逐步的上游迁徙模式，而养殖 S. salar 则更有可能表现出更波动的迁徙行为。野生 S. salar 比养殖 S. salar 更深入地进入了河流流域，尽管在产卵期之前，雄性养殖 S. salar 表现出了最大的累积移动距离。讨论了逃逸或释放的养殖 S. salar 和在自然障碍物处移动的管理意义。
