Introduced algae:
| Algae | Chaetoceros muelleri | diatom |
| Algae | Cyclotella wolterekii | Diatom |
| Algae | Cylindrospermopsis raciborskii | Cylindro |
| Algae | Enteromorpha flexuosa subsp. flexuosa and flexuosa subsp. paradoxa | green alga, grass kelp |
| Algae | Enteromorpha prolifera | green alga, grass kelp, sea lettuce |
| Algae | Skeletonema subsalsum | Diatom |
| Algae | Thalassiosira baltica | Diatom |