Species Accounts – Invasive Species Northern Ireland

New Zealand flatworm

Arthurdendyus triangulatus

Status:

Established

Habitat:

Terrestrial

Threats:

Significant reduction of native earthworms.

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New Zealand pigmyweed

Crassula helmsii

Status:

Established

Habitat:

Freshwater

Threats:

Competition with native species.

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North American signal crayfish

Pacifastacus leniusculus

Status:

Potential

Habitat:

Freshwater

Threats:

Detrimental impacts on white clawed crayfish. Human health impacts.

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Northern Snakehead

Channa argus

Status:

Potential

Habitat:

Freshwater

Threats:

Predation of native fish stocks, vector for disease and parasites

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Nuttalls waterweed

Elodea nuttallii

Status:

Established

Habitat:

Freshwater

Threats:

Negative impacts on native macrophytes and invertebrates.

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Oak Processionary Moth

Thaumetopoea processionea

Status:

Potential

Habitat:

Terrestrial

Threats:

Tree pest. Health risk to humans and animals.

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Oriental bittersweet

Celastrus orbiculatus

Status:

Potential

Habitat:

Terrestrial

Threats:

Outcompetes native wildlife, can choke and shade host plants, sometimes killing them

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Oyster drill

Ceratostoma inornatum and Urosalpinx cinerea

Status:

Potential

Habitat:

Marine

Threats:

Serious impacts on oyster populations.

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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.

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