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US Fish & Wildlife Service FieldNotes
Winged Mapleleaf Propagation
Region 3, October 1, 2010

Twin Cities Field Office, in cooperation with Genoa National Fish Hatchery and the La Crosse Fish and Wildlife Conservation Office, coordinated and led multi-agency efforts to aggregate (July) and to then find and retrieve (September – October) gravid winged mapleleaf for propagation. 

Eighty-eight winged mapleleaf were found during searches of the St. Croix River near Taylors Falls, MN and placed into aggregations to facilitate access to gravid females in the fall.  Four gravid winged mapleleaf were transported to Genoa National Fish Hatchery where biologists infested nearly 400 channel catfish. 

These catfish will be held at the hatchery over the winter and placed in cages in the spring in the lower St. Croix River.  Larvae attached to the catfish will develop and fall to the bottom of the cages next spring.  Some of the larval winged mapleleaf were used for a study of the impacts of catfish size on transformation success that is being conducted by the La Crosse Fish and Wildlife Conservation Office, at U.S. Geological Service’s Upper Midwest Environmental Sciences Center. 

Contact Info: Larry Dean, 612-713-5312, Larry_Dean@fws.gov