Does water temperature effect the color of goldfish?
There is a belief that temperature will impact the coloration and/or the sex of SOME fish when they are eggs being fertilized and as they develop into fry. Much of the color depends on genetics. Color in goldfish is somewhat complex and to my knowledge does not depend on temperature. Goldfish coloration is further complicated because most goldfish are black in color when young and will change to their permanent color after many months.