| Species Name | Country / Port | Port / Vicinity? | Detection Year |
|---|---|---|---|
| Mnemiopsis leidyi | Belgium / Zeebrugge | port | 2007 |
| Mnemiopsis leidyi | Belgium / Ostend | port | 2008 - 2011 |
| Mnemiopsis leidyi | Belgium / Nieuwpoort | port | 2008 - 2011 |
| Mnemiopsis leidyi | Belgium / Antwerp | port | 2018 |