King crab. Photo: Terje Hågenstad
King crabs released off the Kola Peninsula are now spreading westwards through Norwegian waters. Japanese drifting kelp belongs in Japanese and Chinese seas, but has been introduced to European waters along with Japanese oysters. It is now spreading rapidly, but the water temperature is expected to halt its dispersal northwards around Trondheim.
Examples of alien marine species that have become established in Norwegian waters
| English name |
Scientific name |
Country of origin |
| Siliceous algae |
|
|
| |
Odontella sinensis |
|
| |
Coscinodiscus wailesii |
|
| |
Thalassiosira tealata |
|
| |
Thalassiosira punctigera |
|
| Hydromedusae |
|
|
| |
Gonionemus vertens |
|
| Gastropods and bivalves |
|
|
| Slipper limpet |
Crepidula fornicata |
America |
| Sand gaper |
Mya arenaria |
America |
| |
Ensis americanus |
America |
| Shipworm |
Teredo navalis |
Asia |
| Acorn barnacle |
Balanus improvisus |
America |
| Crustaceans |
|
|
| King crab |
Paralithodes camtschaticus |
Pacific Ocean |
| Brown algae |
|
|
| Japanese drifting kelp |
Sargassum muticum |
|
| |
Colpomenia peregrina |
|
Source: Foundation for Nature Research and Cultural Heritage Research