Zebra mussels, a prohibited aquatic invasive species, have been found in a variety of moss/algal ball products for aquariums or water gardens sold in western Canada, including in Saskatchewan.
Northwest wildlife agencies warn of invasive zebra mussels - East Idaho News
New Guidance About Zebra Mussels Found in Aquatic Moss Balls - N.C. Wildlife Resources Commission
Invasive zebra mussels found on pet store moss balls for sale
Invasive zebra mussels found in aquarium moss products (some in Kalamazoo) prompt national response
West Laramie Fly Store - Zebra mussels found in several WY pet stores Do not flush moss balls or pour aquarium water down drains An invasive mussel that poses a serious threat
Ohio Fisheries Say Destroy Don't Dump Moss Balls Because of Invasive Species it May Contain - Scioto Post
NY DEC warns aquarium owners about invasive zebra mussels in 'moss balls
Pest Alert: Zebra Mussels Found in “Moss” Balls — Oregon Invasive Species Council
Mussel Alert: Invasive Species Found In Popular Aquarium Product
Here are 5 things to know about invasive zebra mussels in moss balls
Invasive mussels in aquarium supplies alarm wildlife managers — High Country News – Know the West