Editor's Note

From July 26, 1991 (update #9)

From the start of the 1991 Wisconsin Sea Grant Zebra Mussel Watch in mid- June until July 19, zebra mussel larvae (veligers) were detected only in a water sample collected from the Muskegon, Mich., water filtration plant on July 8. No veligers were found in 77 samples from water intakes on Lakes Michigan and Superior. No zebra mussel veligers were found in 61 harbor samples from those two lakes and Lake Winnebago, and no zebra mussels were detected on any of the 46 substrate samplers examined.

ID: 19910726-1.

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.