Keep Them Out!

Learn more about the various invasive species in the Keep Them Out list.

How are invasive species selected for the Keep Them Out list?

The Keep Them Out list highlights invasive species that have not been confirmed in Nova Scotia or that only exist in small, limited populations. These species pose serious threats to species at risk, ecosystems, and local economies. It is essential to report sightings of Keep Them Out species to the Nova Scotia Invasive Species Council so we can stop them from becoming established in Nova Scotia.

INSECT Anoplophora glabripennis | Other Names: Starry Sky Beetle Description Adult Asian Long-horned Beetles have a shiny black colouration with irregularly occurring white spots on their elytra (hard protective wings). […]

Nematode, Tree Pest Litylenchus crenatae ssp. mccannii Description Beech Leaf Disease is a disease caused by the microscopic nematode Litylenchus crenatae. ssp. Mccannii. This worm-like organism infests beech trees (Fagus), […]

Freshwater Fish Cyprinus carpio | Other Names: European Carp, Eurasian Carp Description Common carp (Cyprinus carpio) is an omnivorous fish in the Cyprinid family, and Koi breeds are commonly sold […]

Aquatic Plant Myriophyllum spicatum | Spiked water-milfoil Description Native to Asia, Europe and North Africa, Eurasian water-milfoil is an underwater perennial plant. Introduced to North America in the 1940s, it […]

MARINE SEAWEED Sargassum muticum Description A long seaweed (typically 1-3 m long) with wiry stems that have small, oval-shaped blades (up to 2 cm long, sometimes toothed), with small spherical […]

FRESHWATER CRUSTACEAN Procambarus virginalis Description Marbled Crayfish are typically less than 10 cm but can be up to 13 cm in length. They have narrow pincers and brown or green […]

FRESHWATER CRUSTACEAN Procambarus clarkii Other Names: Louisiana Red Crayfish, Crawfish Description Red Swamp Crayfish is 7-25 cm in length and has a dark red coloration. The claws are long and […]

MARINE ANIMAL Juxtacribrilina mutabilis Description Live colonies of Ribbed Bryozoan are whitish pink in colour and roughly circular (5‑7 mm wide). Colonies are a single sheet of many connected, oval-shaped “cells.” These […]

FRESHWATER CRUSTACEAN Faxonius limosus Description Spinycheek Crayfish is approximately 10 cm long and has spiny cheeks. Often, they have striped abdomens and legs with orange tips. However, sediment may colour […]