Norwegian Black List

The 2007 Norwegian Black List contains a total of 2483 species of plants, animals and other organisms,[3] 217 of which are risk assessed.

[4][5] A set of criteria has been developed to ensure a standardised assessment of the ecological consequences of alien species.

Alien species on Svalbard, Bjørnøya and Jan Mayen are not assessed.

Among the 93 species which are found to threaten the natural local biodiversity, are bacteria, macroalgae, microalgae, pseudofungi, fungi, mosses, vascular plants, comb jellies, flatworms, roundworms, crustaceans, arachnids, insects, snails, bivalves, tunicates, fishes and mammals.

Among the flatworms; Gyrodactylus salaris, among the crustaceans the red king crab (Paralithodes camtschaticus) and American lobster (Homarus americanus).

The Spanish slug is one of the species on the Norwegian Black List.