Piranha Drama on the Thames

“The Thames is now home to over 119 different species of fish, so the Fisheries Officers were not unduly surprised,” said Tom Cousins, Environment Agency Fisheries Officer. “It was very fresh and had obviously only just died. You could clearly see the marks made by the seagull’s beak on its back.”

The Red Bellied Piranha

The discovery was made on board the Thames Bubbler, which was moored at Halfway Reach in Dagenham. Ironically the vessel, which is owned by Thames Water, is an oxygenation vessel, dedicated to keeping fish and aquatic life alive.

The identification was confirmed by the Curator of the London Aquarium, Paul Hale, who said “It is definitely a Red Bellied Piranha, but it would not survive in the low temperatures of the Thames, and we imagine that it was probably released and then floated to the surface where it was picked up by one of the every hungry seagulls and deposited onto the boat.”

“Piranhas are generally nervous and not the ferocious killers people think they are. They prey on weak and injured animals, including fish, birds and mammals, as well as carrion,” he continued.

Piranhas could not survive in temperatures below 15 degrees Celsius for more than a few days whilst the water temperature in the River Thames is currently closer to 10 degrees. The deliberate release of such a fish into the river is therefore not only illegal, but cruel.

Owners of aquarium fish are reminded that it is an offence to release any non-native species into the wild under the Wildlife and Countryside Act 1981. The Salmon and Freshwater Fisheries Act 1975 also requires the Environment Agency’s written consent to release fish into any inland water.

Fishy Fact File
The Thames Estuary now supports over 119 species of fish, is an important marine nursery ground and plays a major part in supporting North Sea stocks. There are recreational fisheries for a range of species, a commercial eel fishery below Tower Bridge and one for sole below Mucking. A list of fish species found in the river to date is available from Thames Region of the Environment Agency.

The ‘Thames Bubbler’ and her sister vessel ‘Thames Vitality’ are owned and operated by Thames Water PLC. They are dedicated mobile oxygenation barges that pump oxygen into the river during periods of poor water quality. They are operated under Environment Agency supervision.

Further details of the biology and distribution of Piranha are available from the London Aquarium Press Office. Tel: 020 7960 2941.