The International Conference on Aquatic Invasive Species (ICAIS) is the most comprehensive international forum to address new and emerging issues related to aquatic invasive species in freshwater, marine and estuarine environments. ICAIS provides an international platform for the presentation of aquatic invasive species research that pertains to species biology, risk assessment, prevention, management and control methods, ecological and ecosystem impacts and restoration, outreach and policy. The 21st International Conference on Aquatic Invasive Species will be held at Le Centre Sheraton Montreal, Montreal, Canada. The Conference Chair is Dr. Anthony Ricciardi, Professor of Invasion Ecology & Aquatic Ecosystems at McGill University’s Redpath Museum.