Watersports

Whirling disease is caused by a parasite that causes skeletal deformities of an infected fish’s body or head, usually in young fish, and the tail may appear dark or black. The disease can be spread to other waterbodies through spores in mud. This disease is not harmful to humans or other mammals but can have significant effects on some fish populations.

Quagga and Zebra mussels are small, fan-shaped, and range from dark brown to white in colour. Just a few mussels can produce millions of eggs. They are very efficient at filtering nutrients from the water, leaving no food for native species. Dense colonies of mussels can clog water pipes and make the shoreline unusable because of their sharp shells and odour.

Didymo is a freshwater algae that has the appearance of wet toilet paper and the feel of wet cotton wool. It attaches to rocks in streams and can form into large beige to brown mats that completely cover the stream bottom, blanketing important fish and plant habitat.

Felt-soled wading boots (banned in mountain national parks) and other water gear are a common way for didymo to spread. Clean and drain your equipment well, and let dry for at least 48 hours before using it again.

Eurasian water milfoil is a perennial, submersed aquatic plant native to Eurasia and North Africa. Although not currently present in Alberta, new colonies can form from a single stem, seed or leaf. Eurasian milfoil forms thick layers that shade native plants and decrease oxygen levels as they decay.