Introduction to invasive marine fish 

There are several fish species that are considered invasive in Nordic waters or part thereof.

This key focuses on marine species. However, several freshwater species are able to form self-sustaining populations in brakish water (e.g. The Baltic Sea) and will thus be included here.

The key for fish will be here soon - you can get more information here:

• NOBANIS factsheet on Neogobius melanostomus

• NOBANIS factsheet on Oncorhynchus mykiss

• NOBANIS factsheet on Salvelinus fontinalis

• NOBANIS factsheet on Salmo salar

• HELCOM report: Assessment of Coastal Fish in the Baltic Sea

The following species will also be included in the key:

• Aristichthys nobilis

• Carassius gibelo

• Cyprinus carpio