Detective Sergeant Alan Kingsbury said he hoped people in the community might help piece together a timeline leading up to Dahlkamp's death.
"We are still working through this. We have received some calls from members of the public but if anyone has had contact with Mr Dahlkamp in the past 24 hours, we would very much like to hear from them," Kingsbury said.
Mount Maunganui Lifeguard Service general manager Glenn Bradley confirmed the club had helped move the body about 450m to a hearse waiting by the surf club at the base of Mauao.
If anyone has any information they believe might help police in their investigations they are asked to call Tauranga police on (07) 577 4300.