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zebra and quagga mussels
Black and Caspian Sea in Europe
Zebra Mussels are usually less than one inch long, and have a D shaped shell, while quagga mussels are slightly larger had have a rounded shell. Coloration varies from solid light brown to dark brown or striped.
They can reach high densities causing problems for water intakes, docks, boat motors, and infrastructure. They filter vast quantities of water for microscopic organism, potentially altering the entire food web within a water body. These mussels cannot be controlled once they establish themselves in a body of water.
Image of Zebra/Quagga Mussels on Motor
Zebra and quagga mussels are most commonly spread by human transport by recreational equipment. Just because you can't see the mussels doesn't mean they aren't there. Mussel larvae can only be identified with the use of a microscope.
South Dakota Distribution:
Zebra and quagga mussels have not been found in South Dakota.