Track the distribution of invaders into Ontario's inland waters. Invading species, non-indigenous species, or exotics are all terms used to describe organisms that have been introduced into habitats where they are not native. The introduction of invading species is a worldwide problem and is a serious threat to biodiversity. Invading species can cause widespread and unpredictable changes to habitats. These changes can result in damage to ecosystems and native fish and wildlife populations.
Aquatic ecosystems are particularly at risk from introductions of exotic species.
In the absence of predators, competitors, diseases and parasites, populations of exotic species can explode and out compete native species for food and habitat. Introductions to the Great Lakes can occur through a variety of pathways including ballast water discharges from ocean going vessels. Once introduced to the Great Lakes, non-indigenous species can be transported to Ontario's inland waters by recreational watercraft, bait buckets, fishing gear and fish stocking. Anglers using minnows, crayfish and other live bait can spread these organisms by dumping their bait buckets into a body of water. Plant fragments, larval and adult invertebrates, and fish can be unknowingly transported in the live wells, motor intakes, bilges and even on the trailers of boats.