Individuals of the invasive alien seaweed Sargassum muticum were found drifting off the coasts of Lanzarote (Canary Islands). This species is native to the cold temperate northwestern Pacific but currently is widely distributed in the NE Pacific and the Atlantic. The closest known populations of Sargassum muticum to the Canary Islands are located in Morocco, at more than 600 km north of Lanzarote. All Canarian individuals presented numerous pedicellate air vesicles, and some of them had receptacles with mature conceptacles. Although there was no evidence of attached individuals in the area, the release of gametes, zygotes or germlings from fertile individuals could start the invasion processes. Surveys and monitoring programmes should be conducted to avoid population development. The rapid detection of individuals is essential to manage and eradicate colonising Sargassum and prevent it becoming invasive as it has in many other regions.

发现外来入侵海藻Sargassum muticum的个体漂流到兰萨罗特岛（加那利群岛）沿海。该物种原产于西北太平洋的温带气候，但目前广泛分布于东北太平洋和大西洋。已知的Sargassum muticum的最近种群加那利群岛位于摩洛哥，在兰萨罗特岛以北600多公里处。加那利群岛的所有个人都提供了许多有花梗的气囊，其中一些带有成熟的概念性容器。尽管没有证据表明该地区有依附的个体，但可育个体释放配子，合子或种苗可能会开始入侵过程。应进行调查和监测计划，以避免人口发展。快速检测个体对于管理和根除定殖的马尾藻（Sargassum）并防止其像在其他许多地区一样具有侵入性至关重要。