SA Police say their phone lines are being tied up with unwelcome speculation about the fate of missing four-year-old boy Gus in South Australia's mid-north.

On Thursday afternoon, police published a photo of the four-year-old as the search effort continues near the rural town of Yunta, in South Australia's remote outback.

The search entered its seventh day on Friday with no further clues leading to his whereabouts.

On Friday, the presence of police personnel, SES volunteers and the Australian Defence Force had noticeably decreased around the homestead.

However, SES, ADF and SAPOL vehicles were still observed driving around the property, with volunteers also seen on foot.

Senior Constable Peter Williams told ABC Radio Adelaide police phone lines had been "inundated" with information si

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