Invasive species

Lake Ontario’s delicate ecological balance relies on our responsible actions. Let’s take these practical steps to prevent the spread of invasive species:

Clean, Drain, Dry Your Boat and Gear:

-After boating or fishing, meticulously clean your boat, motor, and trailer to remove aquatic plants, mud, or debris.

-Drain standing water from your boat’s transom, live wells, and motor intakes.

-Allow your boat and gear to dry for at least five sunny days before moving to a new water body.

Avoid Releasing Live Fish:

-Refrain from releasing live fish into Ontario’s lakes, rivers, or streams.

-If you have unwanted aquarium fish, consider returning them to a pet store or donating them to a local school.

Be Vigilant Regarding European Water Chestnut and Water Soldier:

-When boating in areas where these invasive plants are present, steer clear of infested zones.

-Remove any European water chestnut or water soldier from your boat, motor, and trailer before traveling over land.

Remember, our collective efforts are vital in safeguarding Lake Ontario’s precious ecosystem. Let’s protect it for generations to come.

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Hamilton Conservation Authority – Cyanobacteria, commonly known as blue-green algae, are naturally occurring bacteria often found in Ontario’s ponds, lakes, rivers, and wetlands. Though they resemble algae, they are actually bacteria that can form surface blooms or benthic mats (clumps resembling vegetation) when temperatures are high and nutrients are plentiful.

These blooms typically appear during hot weather and may look like spilled paint, scum, foam, or streaks on the water’s surface in colours ranging from blue-green to red, brown, or green. They may smell like fresh-cut grass or have a foul odour, and some produce toxins harmful to humans and animals if ingested.

We monitor our reservoirs for potential cyanobacteria blooms. If you suspect you see a bloom, please report it to conservation area staff by sending photos and details, including the exact location. Click here for a full contact list.

If you see a blue-green algae bloom or notice posted warnings:

• Please avoid contact with the water; do not swim or bathe in it.
• If you have already come into contact with the water, wash yourself as soon as possible with clean water.
• Do not drink the water.
• Keep children and pets away from the area.

You can also report suspected blooms to the Ministry of Environment, Conservation and Parks (MECP) by calling the Spills Action Centre at 1-866-MOE-TIPS (663-8477) or submit a report online