What to Look For

Aquatic Invasive Species (AIS) are species that enter into new ecosystems and spread, causing damage to native species and their habitants. These species are spread beyond their normal distribution, often as a result of human activities, and can threaten valuable environmental, agricultural or personal resources by the damage they cause.
Mitten Crab (Eriocheir sinensis)
Origin:
Eriocheir sinensis, is native to the Yellow seas between China and Korea and is another of the 10 most unwanted species in the world. It was first observed in the Great Lakes in 1965 and appeared in the St. Lawrence River in 2004. No other freshwater crab species existed in North America prior to its arrival.
Characteristics:
●    Claws are equal in size with white tips and dense, fluffy hair
●    Can grow up to 8 cm wide
●    Colour ranges from olive green to light brown
●    Legs are twice as long as the carapace width
Impacts:
●    Accelerates river bank erosion by burrowing
●    May compete and prey on native species
●    Population increase may occur in the environmentally-appropriate St. Lawrence River