Staff at the Radisson Blu Waterfront in Jersey were shocked to discover a man swimming with the fish in the hotel's 12,000 litre fish tank as part of a drunken prank.
The man, thought to be a guest at the hotel, spent around 30 seconds bobbing around in the tank until he was spotted by hotel staff who made him get out.
When contacted by Caterer and Hotelkeeper, a member of staff at the hotel said it was the first time a guest had decided to take a dip in the fish tank. However, no one was available for further comment.