| Species | Recipient region | Date of the first record | |
|---|
| Sargassum muticum | France / Western Mediterranean | 1980 |  |
| Sargassum muticum | Ireland | To 1995 | |
| Sargassum muticum | United Kingdom (Britain) / Celtic seas | 1971 | |
| Sargassum muticum | France / Celtic seas | 1976 | |
| Sargassum muticum | United Kingdom (Britain) / English Channel | 1971 | |
| Sargassum muticum | Sweden / North Sea | 1985 | |
| Sargassum muticum | Netherlands | 1977 | |
| Sargassum muticum | Belgium | 1999 | |
| Sargassum muticum | Germany / North Sea | 1988 | |
| Sargassum muticum | Italy / Adriatic Sea | 1992 | |
| Sargassum muticum | Norway / North Sea | 1988 | |
| Sargassum muticum | Denmark / North Sea | 1984 | |
| Sargassum muticum | France / Biscay Gulf | 1975 | |
| Sargassum muticum | Portugal / Iberian Coastal | 1989 | |
| Sargassum muticum | Spain / Iberian Coastal | 1985 | |
| Sargassum muticum | United Kingdom (Britain) / North Sea | 1981 | |
| Sargassum muticum | France / English Channel | 1975 | |
| Sargassum muticum | Sweden / Baltic Sea | To 2005 | |
| Sargassum muticum | France / North Sea | 1979 | |
| Sargassum muticum | United Kingdom (Britain) / North Sea / Orkney Islands | To 2015 | |
| Sargassum muticum | Denmark / Baltic Sea | 1984 | |
