The goldfish is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
A relatively small member of the carp family (which also includes the Prussian carp and the crucian carp), the goldfish is native to East Asia.
It was first selectively bred in Ancient China more than a thousand years ago, and several distinct breeds have since been developed.
Goldfish breeds vary greatly in size, body shape, fin configuration and coloration (various combinations of white, yellow, orange, red, brown, and black are known). (source)
Can guinea pigs eat goldfish?
Unfortunately, they are unable to eat any kind of fish, and so goldfish should be avoided as a food for them.
For more foods that guinea pigs can and can’t eat check out our guinea pig food list