Invasive Species Northern Ireland

Large-flowered waterweed

Egeria densa

Status:

Potential

Habitat:

Freshwater

Threats:

Competition with native plants, shading and blocking waterways, eutrophication and reduction of biodiversity

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Marbled crayfish

Procambarus fallax f. virginalis

Status:

Potential

Habitat:

Freshwater

Threats:

Potential threat of native crayfish. Potential threat to wetlands by extensive burrowing activities.

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Narrow-clawed crayfish

Astacus leptodactylus

Status:

Potential

Habitat:

Freshwater

Threats:

Can impact habitat structure and outcompete native crayfish

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Noble crayfish

Astacus astacus

Status:

Potential

Habitat:

Freshwater

Threats:

Negatively impact habitat structure with burrows, reduce native species, competition with native crayfish

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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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Pacific 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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Pumpkinseed

Lepomis gibbosus

Status:

Potential

Habitat:

Freshwater

Threats:

Highly adaptable to different environments. Fast growing ang high reproductive capacity. Has a broad diet.

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Red swamp crayfish

Procambarus clarkii

Status:

Potential

Habitat:

Freshwater

Threats:

Outcompetes the native European crayfish. Degrades riverbanks through burrowing

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