Cecil, Thanks for providing the new information. Since the Asian carp were the source and now inhabit some river systems in the US this is one more reason not to transport adult fish especialy from the wild to your pond. Since adult fish have been around longer, they are more likely to have been infected with some sort of parasites compared to younger fingerlings.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management