A farm in Perales Bay in Region 12 operated by Servicios de Acuicultura Acuimag SA and one in the Bhutan area of Region 11 owned by Acuinova Chile SA. Salmon reported positive laboratory tests for ISA in some cages, SERNAPESCA said.

Both companies were removing salmon from the impacted areas, the agency said.

ISA has decimated Chile's salmon farming sector the past few years, but the problem is believed to have been put under control. Production is expected to begin to rebound in 2011.