by Wisconsin DNR

MADISON – A virus that first appeared in Wisconsin waters in 2014 and affects common carp and koi is the likely cause of carp die-offs in Madison lakes this past month.

Department of Natural Resources officials say the koi herpesvirus first appeared in Lake Kegonsa around August 11. Testing confirmed the presence of the virus, which appears to have spread to lakes Waubesa and Monona through the Yahara River system.

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