The body of 62-year-old Stephen Jordan was sadly found in the River Irwell near to Cromwell Bridge in Higher Broughton on Sunday 7 October 2018.
Police officers, alongside the fire service, attended.
There were not believed to be any suspicious circumstances surrounding his death and a file was prepared for the coroner.
A Home Office post mortem examination, concluded 17 October 2018, proved inconclusive.
Officers are trying to piece together Stephen’s movements, with the last confirmed sighting of him being on 24 September 2018 at his house on Levens Street, Charlestown, Salford.
Detective Inspector Joe Clarke of GMP’s Salford Borough, said:
“At this stage, we’re treating Stephen’s death as unexplained and we’re working with the coroner to find out exactly how he came to die.
“We have to keep an open mind in these circumstances but we are not currently treating this as a murder inquiry.
“I appreciate the photo we have of Stephen isn’t the best and it is from a few years ago, but I’d ask people to study it and let us know if they saw him between 24 September and 7 October 2018.
“Whatever information you have, we’d be grateful to receive it.”
Anyone with information should contact police on 0161 856 5461 or the independent charity Crimestoppers, anonymously, on 0800 555 111.