Public domain: Introduction events' accounts (50 / 5516)
| Species |
Recipient region |
Date of the first record |
|
| Oithona davisae | Italy / Western Mediterranean | 2014 |  |
| Oithona davisae | Romania | 2010 | |
| Oithona davisae | Russia / Black Sea | 2003 | |
| Oithona davisae | Ukraine / Black Sea | 2001 | |
| Oithona plumifera | Ukraine / Black Sea | From 2001 | |
| Oithona setigera | Ukraine / Black Sea | From 2001 | |
| Oithona similis | Russia / Caspian Sea | 2004 | |
| Okenia pellucida | Israel | 2021 | |
| Okenia picoensis | Italy / Central Mediterranean | 2021 | |
| Okenia picoensis | Italy / Western Mediterranean | 2021 | |
| Omobranchus punctatus | Israel | 2003 | |
| Onchocleidus dispar | Norway / North Sea | 2004 | |
| Oncorhynchus clarkii | Sweden / North Sea | | |
| Oncorhynchus gorbuscha | Denmark / Baltic Sea | 1958 | |
| Oncorhynchus gorbuscha | Denmark / North Sea | 1973 | |
| Oncorhynchus gorbuscha | Faroe Islands | 2019 | |
| Oncorhynchus gorbuscha | Finland | 1970 - 1979 | |
| Oncorhynchus gorbuscha | France / English Channel | 2017 | |
| Oncorhynchus gorbuscha | Iceland | 1960 | |
| Oncorhynchus gorbuscha | Ireland | 1973 | |
| Oncorhynchus gorbuscha | Latvia | 1973 | |
| Oncorhynchus gorbuscha | Norway / Barents Sea | 1960 | |
| Oncorhynchus gorbuscha | Norway / Norwegian Sea | 1960 | |
| Oncorhynchus gorbuscha | Russia / Baltic Sea / St. Petersburg area | 1973 - 1980 | |
| Oncorhynchus gorbuscha | Sweden / Baltic Sea | 1974 | |
| Oncorhynchus gorbuscha | Ukraine / Azov Sea | From 1961 | |
| Oncorhynchus gorbuscha | Ukraine / Black Sea | From 1961 | |
| Oncorhynchus gorbuscha | United Kingdom (Britain) / North Sea | 1960 | |
| Oncorhynchus keta | Finland | 1971 | |
| Oncorhynchus keta | Latvia | 1970 | |
| Oncorhynchus keta | Norway / Barents Sea | 1960 | |
| Oncorhynchus keta | Norway / Norwegian Sea | 1960 | |
| Oncorhynchus kisutch | Belgium | To 1996 | |
| Oncorhynchus kisutch | Denmark / Baltic Sea | 2017 | |
| Oncorhynchus kisutch | Denmark / North Sea | 2017 | |
| Oncorhynchus kisutch | Latvia | 1980 | |
| Oncorhynchus kisutch | Netherlands | 1982 | |
| Oncorhynchus kisutch | Sweden / Baltic Sea | 1984 | |
| Oncorhynchus kisutch | United Kingdom (Britain) / English Channel | 1975 | |
| Oncorhynchus mykiss | Belgium | 1884 | |
| Oncorhynchus mykiss | Denmark / Baltic Sea | 1899 | |
| Oncorhynchus mykiss | Denmark / North Sea | 1899 | |
| Oncorhynchus mykiss | Estonia | 1896 | |
| Oncorhynchus mykiss | Faroe Islands | To 1990 | |
| Oncorhynchus mykiss | Finland | 1898 | |
| Oncorhynchus mykiss | France / Biscay Gulf | 1984 | |
| Oncorhynchus mykiss | France / English Channel | To 1984 | |
| Oncorhynchus mykiss | Germany / Baltic Sea | 1882 | |
| Oncorhynchus mykiss | Iceland | 1951 | |
| Oncorhynchus mykiss | Ireland | 1895 | |
