Non-indigenous species
No species are found in the Norwegian Sea are considered invasive, but the comb jelly Mnemiopsis leidyi is occasionally registered in zooplankton samples (most recent record in 2014), usually in warmer periods.
Threatened and declining species and habitats
Table
1: Threatened
and declining species in the Norwegian Sea, according to OSPAR.
| SCIENTIFIC NAME | COMMON NAME |
| INVERTEBRATES |
| Nucella lapillus | Dog whelk |
| SEABIRDS | |
| Larus fuscus fuscus | Lesser black-backed gull |
| Pagophila eburnea | Ivory gull |
| Rissa tridactyla | Black-legged kittiwake |
| Uria lomvia | Thick-billed murre (or Brünnich's guillemot) |
| FISH |
| Anguilla anguilla | European eel |
| Cetorhinus maximus | Basking shark |
| Dipturus batis | Common skate |
| Lamna nasus | Porbeagle |
| Petromyzon marinus | Sea lamprey |
| Salmo salar | Salmon |
| Squalus acanthias | [Northeast Atlantic] spurdog |
| MARINE MAMMALS |
| Balaenoptera musculus | Blue whale |
| Eubalaena glacialis | Northern right whale |
| Phocoena phocoena | Harbour porpoise |
Table 2: Threatened and declining habitats in the Norwegian Sea, according to OSPAR.
| HABITATS |
| Coral gardens |
| Deep-sea sponge aggregations |
| Intertidal mudflats |
| Lophelia pertusa reefs |
| Modiolus modiolus beds |
| Ostrea edulis beds |
| Seamounts |
| Zostera beds |
