While initial populations of invasive zebra mussels were brought to the Great Lakes on boats and in freighter ballast water, a new source of the invasive species has researchers concerned — pet stores.
The Minnesota Aquatic Invasive Species Research Center has partnered with the University of Minnesota Genomics Center to genetically trace zebra mussels that have been found in aquarium moss balls in pet stores.
Great Lakes Now
https://www.greatlakesnow.org/2021/07/invasive-zebra-mussel-research-genetic-testing/