ODNR CONFIRMS FINDING THE VHS VIRUS IN MUSKIE AT CLEAR FORK RESERVOIR IN NORTH-CENTRAL OHIO
COLUMBUS, OH - The Ohio Department of Natural Resources (ODNR) has confirmed that viral hemorrhagic septicemia (VHSv), a virus that causes disease in fish but does not pose any threat to public health, was confirmed present in muskellunge sampled during routine egg collection in Clear Fork Reservoir in late April. The reservoir is located in Richland and Morrow counties.
The virus was found in ovarian fluid samples collected from the muskellunge as part of routine ODNR testing for VHSv, but has not resulted in a fish kill. The samples were sent to the U.S. Fish and Wildlife Service (USFWS) Fish Health Center in LaCrosse, Wisconsin, where the VHSv virus was initially isolated. It was later confirmed at the National Veterinary Services Laboratory, U.S. Department of Agriculture Animal Plant Health Inspection Service (APHIS) in Ames, Iowa.
These results mark the first isolation of VHSv outside the Great Lakes Basin. Fisheries officials believe VHSv has been a factor in recent fish kills of several species of fish in the Great Lakes that correspond with the end of spring spawning.
VHSv was first isolated as a virus in 1963, and is presumed responsible for European fish kills as far back as 1938. In 1988, the virus was first detected in marine fishes in the Pacific Northwest. VHSv is a pathogen of international concern and is reportable to the World Organization for Animal Health (OIE).
In 2005, VHSv was first reported in the Great Lakes, but may have been responsible for fish kills since 2003. VHSv has been responsible for numerous fish kills in lakes Erie, Huron, Michigan and Ontario. The virus has also been the cause of fish mortality in several inland lakes in the states of Michigan, New York and Wisconsin - all within the Great Lakes Basin.
As a result, APHIS issued an emergency order in 2006 restricting the interstate movement of live fish of susceptible species from the states and provinces of the Great Lakes. Many states around the Great Lakes, including Ohio, developed their own emergency orders restricting intrastate movement to protect other watersheds within their states. For a list of susceptible species, visit APHIS's Web site at http://www.aphis.usda.gov/.
"One likely possibility is that VHS will act like many other viruses in the environment. Typically, viruses or bacteria infect fish, which may lead to disease in the fish if they are susceptible. Once the disease is expressed in these fish, some percentage of the population will die," said Ray Petering, chief of the DNR Fisheries Division. "Those remaining will survive and will develop immunity to the viruses or bacteria that cause a disease. Since there are no large-scale treatments for VHS that can be applied to fish in the wild, the presence of this new virus may result in spring fish mortalities that are abnormally high for a few years, as more fish encounter the virus. These mortalities may abate as fish begin to build immunity to the virus."
Citizens are encouraged to report sick fish or fish kills by calling 1-800-WILDLIFE or use the ODNR Web site at: http://www.dnr.state.oh.us/default/tabid/6518/Default.aspx then from the topic list select: Wildlife - Fishing & Hunting.