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In the wild, goldfish eat crustaceans, plants, insects and will sometimes even eat smaller fish. While you obviously canât match their natural diet exactly, you should try to feed your goldfish food that is similar to what they would eat in the wild.
Goldfish are a specially-bred ornamental variety of carp and thus would eat naturally-occurring carp food in the wild, such as insects, tadpoles and so forth. Fairground goldfish can live for years and grow to astounding proportions, and like all carp can learn to feed from a human hand. (Watch out for the teeth.) They can also be released into the wild and will happily interbreed with local carp, losing their conspicuous colouring after a few generations.