https://www.nytimes.com/2023/12/08/science/goldfish-invasive-great-lakes.html
Inside a fishbowl, the goldfish — a species of carp native to East Asia, bred for aesthetic delight and traditionally believed to bring good fortune — is hardly more than home décor. Usually just a few inches long, it is among the easiest of pets to keep.
But released into the wild, the seemingly humble goldfish, freed from glass boundaries and no longer limited to meager meals of flakes, can grow to monstrous proportions. They can even kill off native marine wildlife and help destroy fragile and economically valuable ecosystems.
“They can eat anything and everything,” said Christine Boston, an aquatic research biologist with Fisheries and Oceans Canada.