Lae Metropolitan Superintendent, Commander Anthony Wagambie junior, says there was no apparent wound found to establish a primary cause of death.
However police have established that the body might have been under water for a number of days before it surfaced.
Wagambie adds that the deceased was identified to be in his late twenties, from Sinesine, Chimbu province and resided on Kapiak Street before his death.
Police have so far established that the man was reportedly in the company of another male when he was last seen.
Meantime, the Met Sup is calling on possible witnesses to come forward with additional information.