Fairgoers are being urged by a council to report goldfish being given away as prizes.
Peterborough City Council said it supported an RSPCA campaign which bans the practice of giving live animals as prizes on council-owned land.
Zameer Ali, Labour councillor and cabinet member for communities, poverty and public health, said: "While rare, we have still received reports of events on our land where fish are given as prizes in recent years, and this is something that we as a council need to stop."
The Animal Welfare Act 2006 states that it is an offence to give an animal as a prize to anyone under the age of 16, except from family.