| Species | Recipient region | Date of the first record | |
|---|
| Karenia mikimotoi | Greece / Eastern Mediterranean | 1989 |  |
| Karenia mikimotoi | Ireland | 1976 | |
| Karenia mikimotoi | United Kingdom (Britain) / Celtic seas | 1971 | |
| Karenia mikimotoi | France / Celtic seas | 1976 | |
| Karenia mikimotoi | United Kingdom (Britain) / English Channel | 1971 | |
| Karenia mikimotoi | Sweden / North Sea | 1981 | |
| Karenia mikimotoi | Netherlands | 1989 | |
| Karenia mikimotoi | Denmark / North Sea | 1968 | |
| Karenia mikimotoi | Germany / North Sea | 1968 | |
| Karenia mikimotoi | Norway / North Sea | To 1966 | |
| Karenia mikimotoi | Spain / Iberian Coastal | To 2006 | |
| Karenia mikimotoi | Portugal / Iberian Coastal | To 2007 | |
| Karenia mikimotoi | Germany / Baltic Sea | 1981 - 1989 | |
| Karenia mikimotoi | Denmark / Baltic Sea | 1968 | |
| Karenia mikimotoi | Sweden / Baltic Sea | 1980 - 1987 | |
| Karenia mikimotoi | France / Western Mediterranean | To 1985 | |
| Karenia mikimotoi | France / North Sea | 1989 | |
| Karenia mikimotoi | France / Biscay Gulf | To 1985 | |
| Karenia mikimotoi | France / English Channel | 1976 | |
| Karenia mikimotoi | United Kingdom (Britain) / North Sea | 2006 | |
| Karenia mikimotoi | United Kingdom (Britain) / North Sea / Orkney Islands | To 2006 | |
