Police have found a body believed to be that of a 23-year-old Indian national who went missing off a bulk ore carrier in WA's North West this week.

The sailor was last seen at the ship’s morning muster about 9.30am on Wednesday but was later reported missing about 1pm when he failed to appear for the afternoon muster.

Port Hedland harbour. Credit:Brendon Thorne

The boat was anchored off Port Hedland at the time of his disappearance, and a large scale water and air search was launched to help find him.

Police had still not found the man by 7pm on Wednesday evening and were forced to suspend the search overnight.

However on Thursday afternoon it was announced a body – believed to be the sailor's – had been found in waters off Port Hedland.

Police said a report on the man's death would be prepared for the coroner.