Emergency services were scrambled to an “ongoing incident” which may have been due to seals.
The coastguard has confirmed that a call was made “with good intent” about someone possibly being in the water.
However, a thorough search of the water near Bridge of Don has turned up no sign of a person.
Three coastguard units, a rescue helicopter from Inverness, as well as crews from the fire service, ambulance service and police officers sent to the scene this evening.
A spokeswoman for the Coastguard said: “All units have now been stood down.
“We believe this to be a false alarm with good intent, someone reported the possibility of someone being in the water.
“It may have been seals.”
A Scottish Fire and Rescue Service spokeswoman said: “We were called to the Bridge of Don area after receiving reports of a water-rescue incident.
“Two appliances were called to the scene at 4.48pm – one based at Aberdeen Central and another based at North Anderson Drive, along with two boat teams – one based at Aberdeen Central and the other based in Dundee.
“Our last appliance left the scene at 6.20pm.”
A spokesman for Police Scotland said: “All other partner agencies have been stood down after the coastguard has carried out a heat sweep and nothing was found.
“We believe it to be a false alarm with good intentions.”