A 23-year-old man died late last night on board the small fishing boat Braveheart berthed at Collafirth Pier.
Police and emergency services were alerted to the incident shortly after 11pm, when another person on the vessel reported the man unconscious on board. Resuscitation was attempted but the man was pronounced dead at the scene.
A police spokesman said there did not appear to be any suspicious circumstances. The man has not been named but police confirmed he was from Shetland.
A report is to be sent to the procurator fiscal.