Invasive invertebrates can be crayfish, snails, mussels, clams, waterfleas, or mysid that impact our aquatic ecosystems by competing with native species for resources, such as food and habitat, and can destroy native fish spawning habitats. Various species of invertebrates have invaded Ontario’s waters through pathways including ballast water, recreational and commercial boating, aquarium and water garden trade, live food fish, and bait bucket release.