Podgy piranhas are put on a diet

A shoal of fat fish have been put on a strict diet to stop them eating themselves to death.

Piranhas at Birmingham Sea Life are being fed half-portions after they put on loads of weight in just a month.

Keeper Lynsey Thompson said: "Each mealtime has turned into a frantic feeding frenzy as they fight for meaty chunks of trout, prawns and mussels."

Wild piranhas can go for weeks without eating and these fish will be closely monitored while they slim down.

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A shoal of the ferocious fish are capable of devouring a whole pig in minutes, and Ms Thompson said they will keep on eating if they're fed too much.

The food they do get will be soaked in extra vitamins so they stay fit and healthy.