Topmouth gudgeon: "they're small and they're a nuisance"

"It out-competes our native fish" says Dave Mee, from the Environment Agency.

"Water becomes totally dominated by these small fish."

"They're small, they're a nuisance and they're not viable for anglers to fish for, so they're not a targeted species".

Advertisement

Deadly Japanese fish

A major project is underway in Llanelli to clear the lakes in the coastal park of an invasive fish. Topmouth gudgeon is a small freshwater fish from Asia. It was brought to Europe accidentally in the 1960s.