Updated checklist of marine fishes (Chordata: Craniata) from Portugal and the proposed extension of the Portuguese continental shelf Carneiro, Miguel Martins, Rogélia Landi, Monica Costa, Filipe O. European Journal of Taxonomy 2014 2014-02-06 73 1 73 49JFF 8022 (Walbaum, 1792) Walbaum 1792 [242,710,891,917] Actinopterygii Salmonidae Oncorhynchus Animalia Salmoniformes 22 23 Chordata species mykiss  – Rainbow trout; Truta-arco-íris ①②③    O. mykissis an alien and invasive species introduced in Portugal. This species is primarily a freshwater fish, although sea-run populations, often known as steelhead, exist in some areas. However, populations of  O. mykissare capable of migrating to and surviving in the sea ( Jonsson 2011).