An invasive aquatic plant is raising concerns after it appeared for the first time in Canada at Hillman Marsh Conservation Area.
It's called hydrilla, and it can grow 2.5 cm a day to a length of 7.5 metres. Conservation officials say it can clog water intake pipes, get tangled in boat motors, and impact swimming and paddling. It can also choke out native species.
It was named a prohibited invasive species under Ontario's Invasive Species Act in 2015.
The Essex Region Conservation Authority shut down the West Cell of Hillman Marsh, including the boardwalk and trail, to boaters, hikers, and hunters.
Hydrilla is easily spread when boat propellers, kayaks, canoes, pets or people inadvertently transport plant fragments to other areas. ERCA is working with the Ministry of Natural Resources, the Invasive Species Centre, and the Ontario Federation of Anglers and Hunters to evaluate the extent of the infestation and contain the spread.
"The detection of this highly aggressive water plant is alarming," said Director of Conservation Services Kevin Money. "Most concerning is its ability to significantly disrupt, alter, and outcompete the natural ecosystem. We take its detection within our wetland with the utmost seriousness."
So far, surveys suggest the infestation is limited to the wetland area of the West Cell of Hillman Marsh, which is not connected to Lake Erie.
"This is the first time that hydrilla has been found in Ontario and Canada, so we are encouraging people to learn how to identify hydrilla, report it, and clean, drain, and dry your boat to help prevent the spread," added Aquatic Invasive Species Coordinator at the Invasive Species Centre Sydney Currier.
Residents who spot hydrilla are asked to report it to the Invading Species Hotline at 1-800-563-7711. Include the location of the sighting and photos.