Aquatic invasive species found for first time in Canada at Hillman Marsh

… for the first time in Canada at a marsh in Leamington … invasive species can choke out native species and clog water intake … a threat to Ontario’s native species and ecosystems. If left …… for the first time in Canada at a marsh in Leamington … invasive species can choke out native species and clog water intake … a threat to Ontario’s native species and ecosystems. If left …