Goldfish is actually a kind of artificial domesticated catfish. About 2000 years ago, ancient Chinese people began to breed silver carp. As food and ornamental fish. Over time, genetic mutations and artificial selection made orange and red on silver carp. The colors such as yellow and yellow changed its dull and boring image, and also created the colorful goldfish that we see today. In the 17th century, goldfish spread to Europe and to the United States in the 1850s. What does this passage mainly introduce? ['The evolution of goldfish.', 'Characteristics of Goldfish.', 'Uses of Goldfish.', 'Goldfish farming.']