Lifeboat crews from Broughty Ferry were dispatched following reports of distress flares on the Tay.
The RNLI all-weather lifeboat and inland lifeboat went out shortly after 11.30pm on Saturday night at the request of Aberdeen Coastguard, following reports of two red distress flares sighted between the Tay Road and Tay Rail Bridges.
However, following an extensive search of the area for almost two hours, nothing was found and the search was called off.
A spokesman for HM Coastguard said: “We had a report of a flare sighting between the two Tay bridges.
“Our lifeboats went out, carried out a search, but nothing was found.”
The lifeboats were returned to station and refuelled and ready by 1.45am on Sunday morning.