Public domain: Introduction events' accounts (50 / 5516)
| Species |
Recipient region |
Date of the first record |
|
| Oncorhynchus mykiss | Latvia | 1899 |  |
| Oncorhynchus mykiss | Lithuania | 1890 | |
| Oncorhynchus mykiss | Netherlands | 1898 | |
| Oncorhynchus mykiss | Norway / Barents Sea | To 2012 | |
| Oncorhynchus mykiss | Norway / North Sea | To 2012 | |
| Oncorhynchus mykiss | Norway / Norwegian Sea | 1902 | |
| Oncorhynchus mykiss | Poland | 1881 - 1889 | |
| Oncorhynchus mykiss | Portugal / Azores | To 1990 | |
| Oncorhynchus mykiss | Portugal / Madeira | To 2002 | |
| Oncorhynchus mykiss | Russia / Baltic Sea / Kaliningrad area | 1882 | |
| Oncorhynchus mykiss | Russia / Baltic Sea / St. Petersburg area | 1881 - 1896 | |
| Oncorhynchus mykiss | Sweden / Baltic Sea | 1892 | |
| Oncorhynchus mykiss | Sweden / North Sea | 1894 - 1900 | |
| Oncorhynchus mykiss | Ukraine / Black Sea | 1938 - 1965 | |
| Oncorhynchus mykiss | United Kingdom (Britain) / Celtic seas | 1884 | |
| Oncorhynchus nerka | Finland | 1967 | |
| Oncorhynchus tshawytscha | Finland | 1930 | |
| Onisimus sextoni | Canada / Hudson Bay Complex | To 2012 | |
| Ophiactis macrolepidota | Israel | 1968 | |
| Ophiactis savignyi | France / Western Mediterranean | To 1969 | |
| Ophiactis savignyi | Greece / Eastern Mediterranean | 1993 | |
| Ophiactis savignyi | Israel | 1948 | |
| Ophioblennius atlanticus | Italy / Central Mediterranean | 2017 | |
| Ophryotrocha diadema | Italy / Central Mediterranean | 2006 | |
| Ophryotrocha japonica | Italy / Adriatic Sea | 1999 - 2001 | |
| Ophryotrocha japonica | Italy / Central Mediterranean | 1999 - 2001 | |
| Ophryotrocha japonica | Italy / Western Mediterranean | 1999 - 2001 | |
| Oplegnathus fasciatus | Italy / Adriatic Sea | 2015 | |
| Orchestia cavimana | Belgium | To 1927 | |
| Orchestia cavimana | Estonia | 1999 | |
| Orchestia cavimana | Germany / Baltic Sea | 1920 | |
| Orchestia cavimana | Germany / North Sea | 1920 | |
| Orchestia cavimana | Netherlands | To 1878 | |
| Orchestia cavimana | Poland | 1899 | |
| Orchestia cavimana | Russia / Baltic Sea / Kaliningrad area | 1957 - 1959 | |
| Orchestia gammarellus | Iceland | 1968 | |
| Oreochromis niloticus niloticus | Belgium | To 2000 | |
| Oscilla galilae | Greece / Eastern Mediterranean | 2016 | |
| Oscilla galilae | Israel | 2009 | |
| Oscilla jocosa | Israel | 1984 | |
| Oscilla virginiae | Israel | 2018 | |
| Osmundea oederi | Italy / Central Mediterranean | 2007 | |
| Ostorhinchus fasciatus | Israel | 2008 | |
| Ostracion cubicum | Israel | 2017 | |
| Ostracoblabe implexa | Ireland | 1949 - 1963 | |
| Ostracoblabe implexa | United Kingdom (Britain) / North Sea | 1950 | |
| Ostrea angasi | France / Biscay Gulf | 1985 | |
| Ostrea angasi | France / Celtic seas | 1985 | |
| Ostrea denselamellosa | France / Biscay Gulf | 1982 | |
| Ostrea denselamellosa | France / Celtic seas | 1982 | |
