It was released by Agriculture, Countryside and Land Management Services, which falls under the Environment & Infrastructure Committee, which said the spread and concentration of sightings indicated 'a sustainable ferret population' on the island.
An updated map of sightings, successful captures and kills suggestive of a ferret outlines the full scale of feral activity over the past weeks.
Agriculture said the density of attacks and the different ages of the ferrets caught gave them concerns of a growing feral population.
'It is early on in the survey process and ferret sightings are widespread, but the map appears to suggest a concentration around the airport and in the Vale,' said a spokesman.
'No feral ferrets have been seen in urban areas of St Sampson's and St Peter Port.
'Both young and mature ferrets are being caught, suggesting that they are breeding in the wild, and if there is adequate food available to the ferrets this may be a sustainable population.'
