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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 will also enjoy eating  krill, brine shrimp, bloodworms, tubifex worms, mosquito larvae,  and daphnia.     If you have a fishpond and quite a few large goldfish, try cat  food. Just buy a brand that has a spherical pellet so that it is  easier for the fish to swallow.