New Sightings Elsewhere in the Great Lakes Basin

From February 19, 1992 (update #12)

CHARLEVOIX, Mich. - The Medusa Cement Company here marks the northernmost sighting so far of zebra mussels along the eastern shore of Lake Michigan. The mussels were found attached to a sunken barge near the company's intake in Lake Michigan about six miles north of Grand Traverse Bay.

KAWARTHA LAKES, Ont. - Zebra mussels have been detected for the first time in Lake Simcoe and in Balsam, Rice and Big Bald lakes in the Kawartha Lakes chain, according to the Ontario Ministry of Natural Resources (OMNR). These lakes are located along the Trent-Severn canal system connecting Lakes Ontario and Huron. The mussels were found as part of OMNR's Zebra Mussel Invasion Monitoring Program.

PICTON, Ont. - Zebra mussel veliger larvae densities in Lake Ontario remained low in comparison with Lake Erie, OMNR biologists reported following the completion of the 1991 Lake Ontario monitoring program. The highest densities reported were 20 times less than typical densities, and 200 times less than maximum densities reported from the western basin of Lake Erie, OMNR biologists said. At the completion of the 1991 monitoring program at water supply intakes, OMNR biologists reported finding no veliger larvae in any water samples collected from three intakes on Lake Ontario at Cobourg, South Peel and Belleville, Ont. Two intakes on Lake Erie (Rosehill and Union, Ont.) and one on southern Lake Huron (Goderich, Ont.) had regular occurrences of veligers.

ID: 19920219-3.

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.