Carp die, but cause unknown
North Dakota and Minnesota officials are looking into what killed thousands of carp in the Bois de Sioux River south of Wahpeton, N.D.
Dead fish have started to pile up between Wahpeton and Breckenridge, Minn., where the Bois de Sioux joins the Otter Tail River to form the Red River, said Mark Henry, a fisheries specialist with the Minnesota Department of Natural Resources.
Because only carp are affected, Henry said a carp-specific disease is likely a factor.
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