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.
Invasive mussels found in aquarium moss balls
Zebra mussels found in aquarium products sold in Sask.
Oregon quarantines aquarium moss balls to stop invasive zebra mussels, Oregon
Environmental Science & Engineering Magazine (ESEMAG) May 1996 by Environmental Science and Engineering Magazine - Issuu
Invasive zebra mussels found in aquarium item sold at pet stores, ODFW says - KTVZ
Alert: Zebra Mussels Found in Aquarium Moss Ball Products
Invasive Zebra Mussels Found in Moss Balls
Habitats of Freshwater Algae - ScienceDirect
B.C. Conservation seizes thousand of moss balls due to hidden invasive species
Pest Alert: Zebra Mussels Found in “Moss” Balls — Oregon Invasive Species Council