Adult zebra mussels have been discovered in Sipiwesk Lake in Manitoba, which is north of Cross Lake and part of the Nelson River.

Zebra and quagga mussels are non-native, freshwater mollusks originally from Eastern Europe and Western Russia.

The Ministry of Environment said an inspection turned up invasive mussels in a boat that was being brought into Saskatchewan from the U.S.

Saskatchewan says it continues its fight to prevent zebra and quagga mussels from entering the province.

Inspection stations throughout the province are now open to prevent harmful zebra and quagga mussels from hitching a ride on a boat into Okanagan waters.

Aquatic invasive species can have a severe economic impact on communities and the province, according to reports.

Invasive mussels, such as zebra and quagga mussels, pose a risk to Saskatchewan waterways.

American officials found a 'substantial' number of zebra mussel larvae in the southern waters of Lake of the Woods, according to Minnesota's Department of Natural Resources. 

Parks Canada has re-opened Whirlpool Lake at Riding Mountain National Park after tests found no evidence of zebra mussels in the water.

With many Manitobans heading out to the lake on the long weekend, the province will be out inspecting boats and helping decontaminate watercrafts.