Olympian Grant Hackett has been released without charge by Gold Coast police.

The 36-year-old left Southport police watchhouse on Wednesday afternoon, after he was arrested following a disturbance at his parents' home at Mermaid Waters.

Hackett's father Neville called police to the family home about noon after the champion swimmer became agitated and verbally aggressive.

The swimmer's brother Craig admitted the family was at a loss with how to deal with his erratic behaviour.