Northern Snakehead
Channa argus
Status:
Potential
Habitat:
Freshwater
Threats:
Predation of native fish stocks, vector for disease and parasites
Nuttalls waterweed
Elodea nuttallii
Status:
Established
Habitat:
Freshwater
Threats:
Negative impacts on native macrophytes and invertebrates.
Oak Processionary Moth
Thaumetopoea processionea
Status:
Potential
Habitat:
Terrestrial
Threats:
Tree pest. Health risk to humans and animals.
Oriental bittersweet
Celastrus orbiculatus
Status:
Potential
Habitat:
Terrestrial
Threats:
Outcompetes native wildlife, can choke and shade host plants, sometimes killing them
Oyster drill
Ceratostoma inornatum and Urosalpinx cinerea
Status:
Potential
Habitat:
Marine
Threats:
Serious impacts on oyster populations.
Pacific or Pink humpback salmon
Oncorhynchus gorbuscha
Status:
Potential
Habitat:
Freshwater
Threats:
Has a high reproductive rate. May predate on native plankton, crustaceans and smaller fish.
Pacific oyster
Magallana gigas
Status:
Established
Habitat:
Marine
Threats:
Encrusts hard surfaces
Pallas' squirrel
Callosciurus erythraeus
Status:
Potential
Habitat:
Terrestrial
Threats:
Outcompeting native red squirrels, and damaging trees by stripping bark.
Parrots feather
Myriophyllum aquaticum
Status:
Established
Habitat:
Freshwater
Threats:
Competition with native macrophytes. Clogging of waterways.
Invasive Species Northern Ireland

Invasive Species Northern Ireland