Due to the potential adverse effects of this disease on fish populations and the desire to prevent or delay its spread to other states, the USDA Animal and Plant Health Inspection Service (APHIS) issued a Federal Order on October 24, 2006, that prohibits the importation of certain species of live fish from Ontario and Quebec and interstate movement of the same species from eight states bordering the Great Lakes, effective immediately. The states included are Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania and Wisconsin.
Fish species included in the federal prohibition are: Atlantic cod, black crappie, bluegill, bluntnose minnow, brown bullhead, brown trout, burbot, channel catfish, chinook salmon, coho salmon, chum salmon, emerald shiner, freshwater drum, gizzard shad, grayling, haddock, herring, Japanese flounder, largemouth bass, muskellunge, Pacific cod, northern pike, pink salmon, pumpkinseed, rainbow trout, redhorse sucker, rock bass, rockling, round goby, smallmouth bass, sprat, turbot, walleye, white bass, white perch, whitefish and yellow perch. Additional fish will be added to the order as they are confirmed to be carriers of this disease. Additional information on the Federal Order can be found on the APHIS website www.aphis.usda.gov/vs/aqua/ .
VHS can be spread from waterbody to waterbody through a variety of means, not all of them known at this point. One known mechanism is through the movement of fish, including bait fish.