Koraaga was a Castle class steel-hulled trawler built in 1914 by Smiths Dock Company, South Bank, Middlesbrough. She was requisitioned as an auxiliary minesweeper operated by the Royal Australian Navy (RAN) in October 1917 for minesweeping duties during World War I, but she was never commissioned. Koraaga returned to be operated commercially as a fishing trawler until she wrecked when she struck a reef off Bass Point whilst carrying returning to Sydney.