The police were alerted at nine o'clock on Friday morning to Lysekil.
A fishing boat had arrived with a corpse in the catch, something that Bohusläningen was the first to report.
Since the fishing had been going on for a long time, no more exact position could be given than that the body had been found between Gothenburg and Skagen.
The police also find it difficult to say how long the person has been missing.
- It is basically just skeletons and clothes, so it has been around, says Lars Ström, on-duty preliminary investigation leader at the police in Uddevalla to the newspaper.
The skeletal parts will undergo a forensic examination and the case will be investigated as a suspected murder.