Another example would be one in Kejimkujik National Park, a national historic site in Nova Scotia. One of the invasive species identified in my colleague's presentation was the green crab, which is a European species that has been found in the waters in the Atlantic. The park basically organizes events during several weekends to capture these crabs and remove them from the ecosystem, because they do have a significant impact on the local species, including local native crabs as well as lobsters and other valuable species.
On October 6th, 2011. See this statement in context.