Calico goldfish are goldfish of any breed that have a type of scale that is intermediate between the metallic type of scales and the transparent type. These scales have a slight sheen that produces a pearly appearance. The name "calico goldfish" came about because the first fish that were introduced with this type of scales had a mottled calico pattern with several colours.
Although calico coloration occurs in many fancy goldfish varieties such as telescope eyes, fantails, ryukins, orandas, and ranchus, the nacreous scale characteristic is usually exclusive to the shubunkins which are single-tailed fish that are similar to the common goldfish and could grow up to 12 inches in length.
- Axelrod, H.R.; Vorderwinkler, W. (1984). Goldfish and koi in your home. T.F.H. Publications. ISBN 0-86622-041-0.
- "An Interpet Guide to Fancy Goldfish" by Dr. Chris Andrews, Interpet Publishing, 2002 - ISBN 1-902389-64-6
- "Fancy Goldfish: A Complete Guide to Care and Collecting" by Dr. Erik L. Johnson, D.V.M. and Richard E. Hess, Weatherhill, Shambala Publications, Inc., 2006 - ISBN 0-8348-0448-4