Pet goldfish are causing chaos on native species after being released into the rivers and lakes by owners, new research has found.
The fish can to grow into two-foot long ‘giants’ in the wild, devouring insects and tadpoles while outcompeting rivals and becoming a risk to biodiversity, according to the Mirror.
Lead author Dr James Dickey, of Queen's University Belfast, said: "Our research suggests goldfish pose a triple threat.
