On the national scale there is a National Invasive Alien Species Strategy.
Provincially, Ontario's Biodiversity Strategy (Action 17) identifies the need to create an appropriate response to Invasive Species. Ontario's Biodiversity Strategy did not "begin" the many biodiversity conservation initiatives in the province, but has provided us with a framework and context for our diverse efforts. The OFAH, with support from the Ministry of Natural Resources, has built the OFAH Invading Species Program, which focuses on invasive aquatic species (plants and animals). Another aquatic initiatives is the Canadian Aquatic Invasive Species Network.
One of the earliest Ontario attempts to develop an effective response came in the form of a guide called Sustaining Biodiversity (City of Toronto; Society for Ecological Restoration, Ontario; Ecological Outlook) - pdf (314 KB).