Zebra Mussel Sightings in Wisconsin

From September 17, 1990 (update #4)

SUPERIOR - Single zebra mussel veligers were detected Aug. 21 in each of two open-water samples from the Superior harbor taken by Wisconsin Sea Grant Zebra Mussel Watch scientist Mary Balcer, UW-Superior. Another veliger was found in a sample taken from one of the same locations on Aug. 28. Balcer subsequently placed additional substrate samplers at these two locations (Howard's Pocket and Interstate Island), and on Sept. 6 two post- veliger zebra mussels were found attached to each of two samplers at depths of 1 meter and 2 meters at Howard's Pocket. A fifth attached post-veliger was found the same date at the Interstate Island site on a sampler at a depth of 5 meters. These observations suggest that a small population of zebra mussels is beginning to develop in the Superior harbor. This also confirms that the veliger and post-veliger sampling techniques used by Wisconsin Sea Grant scientists are effective.

ID: 19900917-2.

The Zebra Mussel Update was a 4- to 8-page quarterly national newsletter published by the University of Wisconsin Sea Grant Institute from May 1990 through May 1997. The ZMU documented the spread of the zebra mussel -- an exotic nuisance mussel -- through North America's freshwater environments, especially the Great Lakes, and on efforts to control it.