Zebra Mussel
The zebra mussel (*Dreissena polymorpha*) is a small freshwater bivalve native to parts of Eurasia and widely recognized as an invasive species in North America.
The zebra mussel (Dreissena polymorpha) is a small freshwater bivalve native to parts of Eurasia and widely recognized as an invasive species in North America. It spreads mainly through ballast water and overland transport on boats and equipment, where it can clog pipes, outcompete native species, and alter aquatic ecosystems.
Description
Zebra mussels are small bivalve molluscs with a distinctive striped shell. They are freshwater species that attach to hard underwater surfaces and can survive transport between water bodies on boats, trailers, and gear.
Distribution and invasion history
The species is native to Eurasia and became established in North America after arriving in the Great Lakes region in the late 1980s. From there, it spread widely through connected waterways and human-assisted movement.
Ecological and economic impacts
Zebra mussels filter large amounts of water, which can reduce plankton and affect native species and food webs. They also clog pipes and water-intake infrastructure, creating costly maintenance problems.
Management and prevention
Control efforts focus on preventing spread, especially by cleaning boats and equipment and avoiding movement of untreated water. In industrial systems, mechanical cleaning and chemical treatments are used in some settings.
Key facts
- Zebra mussels are small freshwater molluscs with striped, D-shaped shells.
- They are native to Eurasia, especially the Caspian and Black Sea regions.
- They were introduced to North America in the 1980s, most likely through ship ballast water.
- They attach strongly to hard surfaces underwater and can spread on boats and equipment.
- Their filter-feeding can reduce plankton and disrupt aquatic food webs.
Zebra mussels are a major invasive species concern for Canadian waterways, especially in Ontario, Quebec, Manitoba, and the Great Lakes basin. They are a cross-border management issue because they affect fisheries, recreation, and water infrastructure in Canada and the United States.
Frequently asked questions
What is a zebra mussel?
Where are zebra mussels native to?
How did zebra mussels reach North America?
Why are zebra mussels a problem?
Are zebra mussels found in Canada?
How can zebra mussels be spread to new lakes?
References
- Fisheries and Oceans Canada — https://www.dfo-mpo.gc.ca/species-especes/profiles-profils/zebramussel-moulezebree-eng.htmlSupports: States that zebra mussels are freshwater hinged mollusks and invasive to all of Canada.
- National Invasive Species Information Center — https://www.invasivespeciesinfo.gov/aquatic/invertebrates/zebra-musselSupports: Gives the scientific name, native range, U.S. introduction date, and introduction pathway.
- National Park Service — https://www.nps.gov/articles/zebra-mussels.htmSupports: Describes zebra mussels as freshwater bivalves likely introduced in ship ballast water and native to the Caspian and Black Sea region.
- Invasive Species Centre — https://www.invasivespeciescentre.ca/invasive-species/meet-the-species/fish-and-invertebrates/zebra-and-quagga-mussels/Supports: Describes North American spread, impacts on plankton, water intake lines, beaches, and spread on boats.
- Minnesota Department of Natural Resources — https://www.dnr.state.mn.us/invasives/aquaticanimals/zebramussel/index.htmlSupports: Provides shell description, size, introduction history, and impacts on equipment and infrastructure.