Muntjac deer
Muntiacus reevesi
Status:
Established
Habitat:
Terrestrial
Threats:
Preventing seed regeneration of important conservation species.
Muskrat
Ondatra zibethicus
Status:
Potential
Habitat:
Terrestrial
Threats:
They change the composition of native wetland vegetation, and their burrowing degrades river banks.
New Zealand flatworm
Arthurdendyus triangulatus
Status:
Established
Habitat:
Terrestrial
Threats:
Significant reduction of native earthworms.
New Zealand pigmyweed
Crassula helmsii
Status:
Established
Habitat:
Freshwater
Threats:
Competition with native species.
North American signal crayfish
Pacifastacus leniusculus
Status:
Potential
Habitat:
Freshwater
Threats:
Detrimental impacts on white clawed crayfish. Human health impacts.
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.
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:
Established
Habitat:
Freshwater
Threats:
Has a high reproductive rate. May predate on native plankton, crustaceans and smaller fish.
Invasive Species Ireland

Invasive Species Ireland