Spring Viremia of Carp Virus in Minnehaha Creek, Minnesota

Abstract

Spring viremia of carp virus (SVCV) causes a highly contagious and serious disease of freshwater cyprinid fishes, generating significant economic and ecological impacts throughout the world. The SVCV is therefore listed as a notifiable pathogen by the International Organization for Animal Health. In June 2011, a significant mortality event of wild common carp Cyprinus carpio occurred in Minnehaha Creek near its confluence with Mississippi River Pool 2 in Minneapolis, Minnesota. Clinical signs of moribund fish included hemorrhagic lesions in the skin, eyes, and internal adipose tissue. The SVCV was isolated from pooled kidney and spleen of the fish. Rhabdovirus particles were seen upon examination of infected cell culture fluid by electron microscopy. The virus was confirmed to be SVCV subtype Ia by reverse transcription PCR and sequencing. This is the first report of SVCV within the state of Minnesota and the ninth documented case in North America.

Received March 27, 2012; accepted July 2, 2012

ACKNOWLEDGMENTS

We thank Wendy Wiese, Becca Wheeldon, and Don Ariyakumar for their exceptional technical assistance at the MVDL. We also thank Don Pereira, Paula Phelps, and Ling Shen from MDNR for critical review of this case report.