A policeman arrived back at the station after his night shift at the weekend to find a goldfish flapping about on the ground outside.
Sergeant Colin Taylor, of the Isles of Scilly Police, quickly scooped up the fish and took it into the station, where he placed it into a sink full of water.
Describing the incident on his Facebook page, Sgt. Taylor said: "I came back to the station at just after 2am to finish my shift. It was a dry, pitch black night. The town was quiet nobody about.
"As I went to unlock the door I looked down and saw a live goldfish on the floor at my feet.
"We often get found property handed in anonymously but really not quite this weird."
The fish has made a full recovery and is currently residing in the lost property section of St Mary’s Police Station.