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The Common Goldfish is a type of carp. These hardy fish have been bred and kept in ponds and aquariums for centuries in Asia. They have an average life span of about 10 years. When goldfish return to the wild, they revert to their natural colors (green to black) in just a few generations.
Anatomy: This brightly-colored fish has orange scales and long, flowing fins. The average goldfish grows to be about 3 to 5 inches (8 to 13 cm) long. The largest goldfish are roughly 10 inches (25 cm) long.
Diet: Like all carp, Goldfish eat tiny plants and animals found rooting in the mud on the pond floor.
