US health officials have overseen the slaughter of 28,000 salmon on a fish farm in Maine, after an outbreak of infectious salmon anaemia was confirmed by laboratory tests.

Control measures were imposed swiftly at the farm in Broad Cove, Cobscook Bay, because the disease ravaged the state’s fish farming industry in 2001, with affected sites being depopulated, cleaned and disinfected, and some being fallowed for up to 90 days.

All fish farms in Maine have been participating in a United States Department of Agriculture (USDA) sampling programme for the disease and it was these checks that led to the detection of the current outbreak, reported the Office International des Épizooties, the world animal health organisation.