Most Unwanted

Asian clam
Corbicula fluminea

Status: Established
Habitat: Freshwater
Threat: Competition with native species. Biofouling.
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Black rat
Rattus rattus

Status: Established
Habitat: Terrestrial
Threat: Negative impacts on native flora and fauna.
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Bloody-red shrimp
Hemimysis anomala

Status: Established
Habitat: Freshwater
Threat: Alteration of ecosystem dynamics. Competition with native species.
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Brown rat
Rattus norvegicus

Status: Established
Habitat: Terrestrial
Threat: Negative impacts on native flora and fauna.
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Chub
Squalius cephalus

Status: Established
Habitat: Freshwater
Threat: Negative impacts on native salmonid species. Associated economic impacts.
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Curly waterweed
Lagarosiphon major

Status: Established
Habitat: Freshwater
Threat: Significant changes to the ecology of the invaded habitat for native plants, insects and fish.
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