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Invasive Species Ireland
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Species Accounts
Species Accounts
Species Accounts
Established
Freshwater
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Freshwater
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New Zealand flatworm
Arthurdendyus triangulatus
Status:
Established
Habitat:
Terrestrial
Threats:
Significant reduction of native earthworms.
Find out more ›
New Zealand pigmyweed
Crassula helmsii
Status:
Established
Habitat:
Freshwater
Threats:
Competition with native species.
Find out more ›
North American signal crayfish
Pacifastacus leniusculus
Status:
Potential
Habitat:
Freshwater
Threats:
Detrimental impacts on white clawed crayfish. Human health impacts.
Find out more ›
Northern Snakehead
Channa argus
Status:
Potential
Habitat:
Freshwater
Threats:
Predation of native fish stocks, vector for disease and parasites
Find out more ›
Nuttalls waterweed
Elodea nuttallii
Status:
Established
Habitat:
Freshwater
Threats:
Negative impacts on native macrophytes and invertebrates.
Find out more ›
Oak Processionary Moth
Thaumetopoea processionea
Status:
Potential
Habitat:
Terrestrial
Threats:
Tree pest. Health risk to humans and animals.
Find out more ›
Oriental bittersweet
Celastrus orbiculatus
Status:
Potential
Habitat:
Terrestrial
Threats:
Outcompetes native wildlife, can choke and shade host plants, sometimes killing them
Find out more ›
Oyster drill
Ceratostoma inornatum and Urosalpinx cinerea
Status:
Potential
Habitat:
Marine
Threats:
Serious impacts on oyster populations.
Find out more ›
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.
Find out more ›
Invasive Species Northern Ireland
Invasive Species Northern Ireland
Invasive Species Week
Invasive Species Week 2023
Five things you can do
Do one thing for nature pledge
Ideas for events and activities
Useful Resources
Back
Invasive Species Week 2022
ISW 2022 Events & Webinars
Back
Back
About ISNI
Research
Invasive Species Maps
Back
Legislation
EU IAS Regulation
Management Measures for Widely Spread Species
Back
Northern Ireland
Policy Documents for Northern Ireland
Back
Species Accounts
Species Alerts
American lobster – Retain & Report
List of identification guides
Back
What can I do?
Invasive Plant Management
Site Management Resources
Back
Biosecurity & Prevention
Pathway Action Plans
Check Clean Dry
Guidance for Anglers
Guidance for boaters
Guidance for canoeists, kayakers and stand up paddle boarders
Guidance for Aquaculture
Guidance for field workers
Guidance for clubs and managers of water bodies
Guidance for events
Check Clean Dry Resources
Back
Be Pet Wise
Be Plant Wise
Back
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