Wildlife Survey & Photo Service
The only known Zebra Mussel infestation in California is in San Justo Reservoir near Hollister. They were discovered in the lake in 2008. We do not know how the mussels were introduced into San Justo. The reservoir is closed to the public to prevent movement of the mussels to other waterways.
They were introduced into the Great Lakes probably in the ballast of transoceanic ships. They were discovered in Lake St Clair, near Detroit in 1988.
Quagga Mussels were discovered in Lake Mead NV., in 2007. They were discovered in Lake Erie in 1989 but not recognized as Quagga Mussels until 1991. We think they were transported to Lake Mead attached to the hull of houseboats.
Golden Mussels were introduced into Argentina from Asia in 1991 probably in ship ballast. They have since spread into four other South American countries. I am concerned because they have a wider tolerance for ecological tolerances than the Dreissenia mussels.
Together, Zebra, Quagga, and Golden mussels are called the Eurasian Mussels.
Mussel veligers (larvae) are the microscopic form that are transported in ballast, live wells, and other wet areas of watercraft.
Various sizes are show on the left as seen under a cross-polarized microscope.
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