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Higgins Eye Recovery in Action on The Upper Miss
Midwest Region, September 30, 2004
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On a beautiful autumn day in September 2004, 3000 cultured, sub-adult Higgins eye pearlymussels (Lampsilis higginsii) were placed in their new home in the Upper Mississippi River. This joint effort by the US Army Corps of Engineers -St. Paul District, Minnesota Department of Natural Resources, the Twin Cities Ecological Services Field Office, and Genoa National Fish Hatchery marks the second attempt to place cultured sub-adult Higgins eye into new habitat where no or few zebra mussels are found. The zebra mussel, an exotic species, is today the primary threat to the federally endangered Higgins eye and other native mussels of the Upper Mississippi River. Two year-classes (2002 and 2003) were a part of this transplant. Of the 3,000 sub-adults used in this year's transplant, 700 were from the 2002 cohort while the remaining mussels were from the 2003 cohort. The day before the transplant, all mussels were given either an individual numbered tag or a black dot tag to aid in monitoring efforts in the future. Like parents not quite ready to turn loose of their youngest child, biologists placed the 2003 subadults under three protective ?blankets? made of wire or plastic screen. These ?blankets? are designed to prevent large fish such as freshwater drum, carp, and suckers from preying upon the smaller sub-adult mussels. Next fall, biologists will transplant an additional 5,000 sub-adult Higgins eye from the 2003 cohort and possibly some sub-adults from the 2004 cohorts. For additional information on this project or other mussel projects in Region 3, please contact either Tony Brady, Genoa NFH, at 608-689-2605, or Gary Wege, Twin Cities ES Field Office, at 612-725-3548 ext. 207.

Contact Info: Midwest Region Public Affairs, 612-713-5313, charles_traxler@fws.gov



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