Authors : Patrick M. Muzzall, Michael V. Thomas, and Gary Whelan
A total of 1,270 cyprinids consisting of emerald shiners, Notropis atherinoides Rafinesque, 1818; spottail shiners, Notropis hudsonius (Clinton, 1824); mimic shiners, Notropis volucellus (Cope, 1865); and sand shiners, Notropis stramineus (Cope, 1865) (Cyprinidae) collected in 2009–2013 from Saginaw Bay and Port Sanilac, Lake Huron, and Lake St. Clair, Michigan, U.S.A., were examined for the nonnative Asian fish tapeworm, Bothriocephalus acheilognathi. The prevalences, mean intensities, and mean abundances of this cestode in the cyprinid species varied from 0 to 28%, 0.0 to 5.8, and 0.00 to 1.11, respectively. The infection values of B. acheilognathi were higher in Notropis spp. from Saginaw Bay than in Lake St. Clair. The proportions of infected and uninfected emerald shiners increased significantly from 2009 through 2011 and 2013 in Saginaw Bay. Emerald and mimic shiners are new host records for B. acheilognathi. Saginaw Bay and Port Sanilac, Lake Huron, and Lake St. Clair are new locality records for B. acheilognathi. The distribution of B. acheilognathi now extends north into Lake St. Clair and Lake Huron since its original detection in the Detroit River. Further, since Saginaw Bay and Lake St. Clair are important sources of wild-caught baitfish for the retail baitfish industry, this range extension of the Asian fish tapeworm raises fish management concerns for its spread into other waters of the state through bait bucket transfers.